Jake awoke feeling extremely confused.

Ordinarily he’d expect to be woken up by his alarm clock, or natural light, or even the sound of birds chirping outside. Today, however, he’d woken to darkness. There was a soft yet firm mass weighing on his face, and a… “Ugh…” …a really bad, sour smell in his nose.

“The hell…” He muttered, groggily. He tried to sit up, but whatever was squashing him was too heavy, and for some reason he couldn’t move his arms. The mass reacted, though, adjusting to his struggles, and he swore he heard a muffled giggle from above. His eyes narrowed as he began to piece the puzzle together. “Is this… someone’s ass– ?”

Bbbbbbbbbbfffffffffrrrrrrrrrrrrrrraaaaaapppppp!

A hot, smelly burst of wind confirmed it – someone was sitting on his face, and they’d just farted!

“What the fuck!” He yelled angrily, gagging on the cheesy gas. “Get off of me!” The stink gave him a burst of strength, and with a mighty shove, he managed to push off his vulgar assailant. She jumped off to the side, laughing like a hyena, and bent to shake her ass at her still-bewildered brother.

“Calm down bro, it’s just a fart!” Ashley said cheerfully. Of course it would be her. At 18, Ashley was the youngest of his 3 sisters, by far the most energetic and likely to tease him. She was also – as his friends liked to remind him – incredibly hot.

Ashley had an attractive face, golden blonde hair (currently tied up in a ponytail) and a toned, slim body. A rising Instagram model, she took her fitness very seriously; she jogged daily to keep her stomach flat, and countless squats had given her a large, bubbly ass that nothing she wore seemed to contain without a struggle. Right now it was stuffed into her old pair of gym shorts, and a dark patch of sweat had pooled on the crack. She must have just been on a run.

“What the hell was that for?!” He demanded.

“I called your name twice, but you wouldn’t budge. So really it’s your own fault!” She laughed. “Now come on, stop being so lazy! Time to get up!”

It was too early to be dealing with this. “…Just… leave me alone,” he muttered, turning back over.

“Nuh-uh, no you don’t!”

She quickly grabbed his pillow, leaping away before he could snatch it back. Then, bizarrely, she started rubbing it against her ass! She threaded it between her legs and flossed back and forth, wedging it deep up her crack, where it soaked up enough of her ass-sweat to form a damp yellow stain; only then did she throw it back, hitting him squarely in the face.

“There, good luck sleeping on that!” She grinned. “Hurry up already – I’ll be waiting downstairs!”

“Ugh, you’re disgusting!” Jake yelled as Ashley ran out the room. He grimaced at his sweat-stained pillow. There was no way he was using it now, absolutely reeking of his little sister’s ass. He threw it aside, letting it hit the floor with a soft squelch, then sighed heavily. “Might as well get up… I’m wide awake now, anyway.”

Yawning, he threw on some clothes and went out into the hall – almost colliding with another sister in the process.

“Oh, hey, Natalie.”

“Good morning, Jake,” she smiled. His middle sister was 19, a biology student about to start her second year of college. Like Ashley, she was very attractive – but if Ashley was “hot”, Natalie was the definition of “cute”. Her hair was strawberry blonde, long and straight, with bangs that almost reached her bright blue eyes. Given her slender figure her ass and chest were surprisingly large, though often hidden beneath more conservative clothing. Today she wore a simple white jumper and a pair of jeans. “I was just about to come and wake you up.”

“Ashley beat you to it already.” He grumbled. “Is there a reason nobody’s letting me sleep in today?”

“Yeah, Mom wants us all downstairs. Apparently, she has a big surprise for us!”

“Wow, I can hardly wait,” He replied sarcastically, too tired to pretend to be excited. He made his way into the bathroom and over to the sink, grabbing his toothbrush. “Seriously, just leave me out of it next time. I bet Rachel can’t be bothered with this eith– ”

Jake froze, then began to gag and retch. His toothbrush tasted… revolting! Even beneath the minty fresh toothpaste, there was a rotten, bitter flavour that completely overpowered it. Spitting didn’t help. The awful taste remained, deep, acrid, and weirdly familiar. It almost reminded him of… this morning?..

“Not very nice, I take it?” Natalie had pulled out a notepad, and was scribbling something into it.

“Natalie, what the – did you – did you fart on my toothbrush?!”

“Mhm… Well, do be precise – ” She flipped back a page. “ – the object was placed between my ass-cheeks for a period of 20 minutes, during which time 7 gas events occurred.” She looked up and smiled. “It’s an experiment I’m doing, for college.”

“What the fuck is wrong with you?!” He yelled, and started shoving her out the room. “Get out!”

“Ok wait, wait! Just one question.” She paused a moment. “How does the smell compare to the taste?”

He blinked. “Huh? What smell – ” Suddenly a rank odour attacked his nostrils, and he staggered backward, gagging. A silent-but-deadly! “Natalie!”

“Alright, see you downstairs,” she giggled as Jake slammed the door shut between them. “Oh, and Mom says bring Rachel down with you!”

It took Jake a moment to realise he’d just trapped himself in a small room with the still-powerful scent of his sister’s gas, and he sighed angrily as he covered his nose with his shirt.

“Great. First Ashley, now Natalie too… when did they get so gross?” He muttered to himself angrily, reaching for the mouthwash to try and get the awful taste off his tongue. He could only hope it hadn’t also been subject to his sister’s “experiment”.

*

10 minutes later, Jake still hadn’t gotten the taste of fart out of his mouth. Eventually he was forced to accept defeat; he walked back out into the hall, continuing to scrape ineffectually at his tongue as he made his way to his older sister’s bedroom.

“Hey Rachel,” He called as he knocked on her door. “You up?” There was no response, but that was to be expected. Rachel slept in even longer than he did, and wasn’t usually out of bed until near midday. Sighing, he pushed open the door and made his way inside.

His eldest sister was something of a slob, and her room reflected her personality. There were fast-food wrappers everywhere, and so many dirty clothes on the floor it was hard to find space to put his feet! The worst area was around her computer, where she spent the majority of her time. Rachel was an avid and extremely competitive gamer. She had even won money in a few online tournaments.

As expected, Jake found her still sprawled out across the bed, lying on her stomach and snoring heavily. She’d kicked the covers off in her sleep, and wore only a bra and panties, so he could see her entire body.

Rachel was easily the biggest of his sisters, and not just because of her height (she was three inches taller than even he was). She wasn’t overweight by any means, but her unhealthy lifestyle had given her a slightly pudgy belly, a massive chest, thighs as thick as tree trunks – and an ass so big it beggared belief. It made the panties she was wearing look like a thong!

“Hey, Rachel. Rachel!” She didn’t react to his calls. Rolling his eyes, he leaned in closer and reached out to poke her in the shoulder.

Suddenly her arm shot out and grabbed him by the wrist.

“Wha– ”

“Well, if it isn’t my adorable little brother!”

Before he could react, she was yanking him forward onto the bed. His (apparently!) awake sister rolled onto her side and lifted a leg up, then pulled him between her thighs before slamming them shut. He gasped and tried to wriggle free, but her grip was like iron. He was completely trapped in her headscissors!

“Morning, Jakey! Big sis has got a present for you!”

Brrrrrrrrooooooooooooooorrrrrrrrrrrrpppppp

“Mmmmph!”

Thanks to her scissorlock, Jake’s face was only inches from her ass when she’d chosen to rip an absolutely rancid fart! He screamed and tried even harder to break free, but Rachel was far stronger than he was. She just laughed at his futile attempts to pull her thighs apart.

“Aww, don’t you wanna cuddle up in bed with your big sister? Haha, quit squirming, loser! Fine, fine, I’ll let you go.”

When she finally released him, he almost fell over backwards trying to get away from her smelly rear. He looked up at her furiously as she sat up straight, still laughing at his misfortune.

“Morning gas! It’s the worst, am I right?” She winked and flicked her dirty blonde hair out of her face. For someone who put almost no effort into her appearance, Rachel was exceptionally good-looking. She had a naturally pretty face, piercing blue eyes and full lips that usually displayed a smug grin. People often said that she could be the most beautiful of the sisters… if she actually decided to try. Jake, of course, had more pressing concerns on his mind than her looks.

“God! Another fucking fart?!” He coughed. “What is wrong with you three today?!”

“Hm? Not sure what you mean. You’re the weirdo who just had his face up his big sister’s ass.” Ignoring his immediate angry reaction to her comment, Rachel got up and looked idly around the room, then picked up some used clothes from the floor to wear. She chose a tank-top and a pair of black leggings.

“Anyway, shall we go downstairs for your surprise?”

“Huh? Wait, you already knew about that?” He stopped ranting and frowned. “And what do you mean my surprise?”

“Oops… was I not supposed to say anything?.. Oh well.” She shrugged. “Yeah, we’ve been planning this for a little while now. A lovely little birthday surprise, just for you~! Exciting stuff, huh?”

“Uh… but it’s not my birthday until next week?”

“Yeah, yeah, Mom’s gonna explain it all, just wait. Remember to look shocked! I imagine it won’t be difficult.”

She put an arm around his neck and began to steer him forcefully out of the room. As the eldest sibling, Rachel had always been the “leader”; confident, assertive, but often so headstrong she bordered on mean. Her sheer physical presence had always intimidated him – he felt almost like a prisoner as she marched him forward, his head uncomfortably close to her unwashed armpit.

He couldn’t help feeling weirdly nervous as they walked downstairs together. This whole morning had been one bizarre event after another. His sisters had never been shy about passing gas, but all 3 of them torturing him with their stink back-to-back? That had to be more than coincidence. The fact that Rachel was even up this early was strange by itself. And then there was this surprise… it definitely seemed they were planning something, but he had no idea what.

The pair entered the dining room to find their family already stood around the table waiting for them: Ashley, Natalie, and their Mom.

“Well, look who’s finally up!” His Mom smiled at him. One glance made it clear where his sisters had inherited their good looks from. While she was a little past her prime, Jake’s 44 year old mother could easily pass for a woman 10 years younger; her face had a regal, mature beauty, and although her weight had increased in recent years, almost all of it had gone to her hips, thighs and butt. The result was an ass that dwarfed even Rachel’s, and could only be described as mountainous. “Come on over sweetie, take a seat! We have a very special surprise for you...”

“Yeah, I heard,” Jake muttered, sitting himself at the head of the table. Everyone else continued to stand, however. They moved in close to surround him, making him feel a little uncomfortable as they loomed overhead. “…So… what’s my surprise, then?”

“You have to close your eyes first.”

“Wouldn’t be much of a surprise if you saw it coming, would it, bro?”

“Uh… right.” Something definitely felt off here, but Jake was too tired to worry about it. “Let’s just get this over with… I’ll find another pillow and go back to bed,” he thought. With no clue that the decision he was making was about to change his life forever, he obediently did as he was told, and allowed his eyes to fall shut.

The girls acted quickly.

They each had their own task to perform, and each moved to achieve them with fluid, practiced coordination. In the exact same instant, Rachel snapped a cold, metal collar around her brother’s neck; Ashley slapped a strip of duct tape across his mouth, and Natalie threw a belt across his chest and arms and fastened it around the back of the chair, leaving him totally restrained. Jake felt this all simultaneously, and immediately opened his eyes in panic – only to find himself face-to-face with his own mother’s enormous ass!

Bbbbbbbbbbbfrrrrrrrrrrrrrrrrrrooooooooooooooooooooorrrrrrrrrrrrrrt

“Mmmpfffhh??!?” The powerful blast of wind blew Jake’s hair back and stung his eyes – and the smell! Like rotting meat and cheese! It was the worst thing he’d smelled all day (and possibly ever), and he was completely unable to escape it. He didn’t know why, but he couldn’t move, or even breathe through his mouth. All he could do was continue to breathe in the rotten aroma! “What the hell is going on?!”

“Alright, good work everyone.” Smiled Natalie.

“Ewww, Mom! I can smell that from here!” Ashley laughed, fanning her nose from a safe distance.

“That’s because Jakey’s doing a shitty job sniffing it up,” said Rachel.

“Now now, remember your brother is still learning. Once we’ve trained him up a little, he’ll be sniffing farts like a pro!” His Mom gently chided. She turned to her son, and saw the fear and confusion in his eyes. “Oh, I’m sorry, Jake. This is all very sudden, isn’t it? Here, just you relax while I explain what’s going on.” She took a seat next to him and smiled. “So, the first bit of news is that your sisters and I have something of a fetish for face-farting unwilling victims. In particular, we all really enjoy face-farting you.”

“In case you hadn’t noticed!” Ashley piped up.

“Shh!”

“I suppose it must run in our side of the family!” His Mom continued. “A certain distant relative of yours had a passion for dominating men, too. You never met her, but when she sadly passed a few months ago, her will dictated that a lovely little holiday home and a sizable sum of money was to be given to one of your sisters. She wanted it to help them in becoming a “powerful, successful woman, one who can show a man that his true place in this world is beneath her”. I think we’re all agreed on who that man should be!”

Jake’s eyes widened. Was she saying… what he thought she was saying?..

“That’s right, Jake!” She patted him gently on the hand. “So here’s what’s going to happen now. You’re going to spend the next few days serving the four of us as an obedient fart slave! You’ll spend intimate, one-on-one time worshipping each of your sisters; and exactly one week from today, on your 21st birthday, you’ll choose one of them to live with as your permanent, personal fart mistress!” She smiled, and the expression on her face was warm and genuine. “Isn’t that fantastic?”

He looked to each of his sisters in horror, searching for salvation. He found none.

“Did you enjoy the first taste of your new life this morning, Jake?” Natalie asked.

“I hope so, because you’re gonna be tasting a lot more this week!” Said Ashley.

“Yeah, you’re gonna have to work hard, Jakey.” Rachel clapped him on the back. “After all, gas ain’t free!”

As his family members burst into laughter all around him, and began eagerly discussing their plans to use and abuse his nose, Jake was still struggling to comprehend how quickly his world was changing.

“This… has to be a joke, right? They’re going to let me go in a second and reveal this is all just a big, stupid joke!” He tried to cling to that desperate hope, but somewhere in the back of his mind he knew the truth. This was all too real.

He was only a few minutes into what was going to be a Week of Hell. 7 days… 7 whole days of disgusting, smelly, ass-scented slavery was what he now had to look forward to.

And when it was finally over, the entire rest of his life… was going to be even worse.

Monday

Jake stared blankly into space.

He was sat unmoving at his dining room table, and not just because he was tied to the chair. He felt numb. Only a few minutes ago, he’d been told he was going to be a fart slave to one of his sisters, and he was still reeling from the shock. He was barely even registering the conversation his family were having in front of him, despite him being the very subject of their discussion.

“Alright then ladies, first things first! We need to set out exactly when your brother will be serving each of us throughout the week.” His Mom produced a piece of paper with some sort of table on it, and invited her daughters to take a look. “I’ve drawn up a rota for him here. Initially he’ll only be worshipping one of us at a time, for one full day each. That’s because after his birthday only one of you will become his permanent, full-time mistress, so he needs one-on-one experience with you all to help him make his decision. Now, for today – ”

“Hey, no fair, Mom!” Ashley suddenly interrupted, pointing at the rota. “Why do you get two days?”

“Well, I am his mother!” She replied, a little hotly. “And besides, after this week I’m going to have to give him up to one of you three forever. So of course I want keep him all to myself a little while longer!”

“Personally, I don’t think we should even bother with this whole thing. I mean, he’s just gonna pick me in the end anyway, aren’t you, Jakey?” Rachel grinned evilly, ruffling his hair. “Huh? You can’t wait to be your big sis’s fart slave, can you?”

“I don’t know about that,” said Natalie. “I just need a few hours alone with him. He’ll quickly learn to love my gas.”

“You’ll all get your chance, girls!” Their mother smiled proudly. “But as I was saying before, he’ll spend his first day alone with me. I’ll give him some basic slave training, break him in a little, so he’ll be a bit more submissive for when you three use him. How does that sound to you, honey?”

She was talking to him, he realised. Jake looked up slowly to meet his mother’s eyes. She reached down and peeled off the duct tape covering his mouth, causing him to wince, but he didn’t complain. “I need to play along,” he thought to himself. “I need to act docile so they’ll let their guard down. Then the first chance I get, I can escape!”

“If I untie you from that chair, are you going to be a good boy and stay put?”

“That was fast.”

“…yes. I’ll – I’ll behave,” he agreed, ignoring his sister’s giggles. His Mom smiled supportively and walked behind him, then began undoing the clasp on the belt that had him trapped. A few seconds later he was free.

“There you go,” she said, giving him a gentle pat on the head. “Now why don’t we – ”

Jake bolted.

“Oh, well that’s a little disappointing.” He heard his Mom comment dryly behind him as he sprinted away. His sisters were yelling something too, but Jake wasn’t listening; his sole focus was getting out of there as quickly as possible.

He had never moved so fast in his life. He flew through the dining room and kitchen, kicking off the wall to conserve momentum as he turned into the hall. “I can make it!” He told himself, daring to hope. He could see the front door now – he could almost reach it – he was so close! – what was that weird beeping noise?

Bzzzzzzzzzt!

Jake collapsed to the ground as a powerful electric shock coursed through him, beginning at his neck and spreading throughout his body. The current forcefully and painfully contracted his muscles, paralysing him in a state of agony – until it suddenly vanished, just as quickly as it had started. “Wh – what was that?” He gasped, slowly sitting up. “Did I get tased?”

“You only have yourself to blame for that, bro!”

He looked back toward the kitchen to see his family laughing at him, and his Mom waving a little metal device in her hand.

“Like your collar, Jakey?” Said Rachel. “It’s connected to the remote Mom’s holding. One push of that button, and you get a nasty jolt… but she didn’t even need to use it just now!”

“Shock collars are a popular BDSM tool, but ours comes with a special feature. A proximity trigger,” smiled Natalie. “As long as you’re wearing it you have to stay within a few metres of your owner, or you’ll get a zap like that once every few seconds.”

“Isn’t that great, sweetie?” Said his Mom. “Now you have to stay close to one of us at all times. You’ll be totally dependent on us!”

“…No…” Jake whispered, slumping forward in despair. “There’s no escape,” he realised, horrified. He could tell just from feeling it that the collar was iron-tight. He would never get it off by himself – and as long as he wore it, he was completely at their mercy.

“Now if you’re finished with your little escape attempt, mister, I think it’s about time we got started.” Jake looked up fearfully as his Mom walked menacingly toward him. He gulped as her shadow fell over him, and she began to slowly turn around. “You still have a long day ahead of you, and I want you to spend as much of it as possible up my ass!”

*

True to her word, Jake’s Mom wasted no time in smothering him beneath her yoga-pants clad rear. She brought him into the living room and lay him face-up in her favourite armchair before lowering herself directly onto his head.

“Your sisters have all gone out, by the way,” she chatted casually, plopping herself down and switching on the TV. “For the next few days, everyone except you and whoever you’re serving are going to make themselves scarce during the day. That way you’ll have some privacy, and it’ll more accurately simulate what life will be like when it’s just you and your mistress, forever!”

His Mom’s butt was hot, smelly and incredibly heavy, making it difficult for Jake to breathe. He pushed at it desperately, trying to lift her off; he was a little worried at first that he might receive a shock for doing so, but she didn’t seem to mind his struggling. In fact, unbeknownst to her son, she was actually enjoying the unintended ass-massage.

And at any rate, his attempts to stop her massive rear from crushing him were not very successful. He occasionally managed to lift it a few fractions of an inch, but never for long. His arms collapsed too quickly under her weight. He felt like the Greek hero Sisyphus, eternally pushing a heavy boulder up a hill only for it to inevitably roll gently back down on top of him.

“I’ll just be a few more minutes, OK?” His Mom said as she flicked through channels absent-mindedly. “As soon as the big breakfast I ate starts to kick in, we can finally begin your training.”

“Mom… please!” Jake gasped, managing to lift her just enough to speak. “Why are you doing this? Don’t – don’t you love me?”

“Oh now don’t be silly, sweetie. Of course I love you! And your sisters love you, too – that’s why they all want to spend the rest of their lives with you!”

“B-but I want to live my own life! I want to get a job, a car, a girlfriend – ”

His Mom burst out laughing. “Jake, honey, you can’t even get my big bum off your face!” He turned bright red as his mother’s chuckling made her ass jiggle. The motion weakened his arms, and she gradually sank back down toward him. “I’ll tell you what. If you can lift me up far enough to crawl out from under there, we can have a talk about you living your own life. How’s that?”

That was the greatest motivation he could possibly have asked for. Placing one hand one each of his Mom’s enormous cheeks, Jake summoned every ounce of strength in his body, and shoved hard! He groaned with effort, pushing like his life depended on it – because, in a way, it did. And slowly but surely, inch by inch, her ass began to rise; until finally, arms fully extended and shaking from the strain, he had lifted her clear away.

“I did it!” He was just about to shout in celebration when he heard a loud gurgle from above.

“Ahh, there’s my breakfast!”

Bbbbffffffrrrrrrrrrrrrrooooooooooooorrrrrrrrrrrppppppppp

A thunderous fart, thick and powerful, blasted him square in the face. It smelled strongly of sausages, egg and beans, and one whiff had him gagging – and the moment he lost focus, his arms gave way and his Mom came crashing back down, flattening him.

“Mmmnngg!” He moaned. The force of her fall had effectively buried him in her crack, and he had no strength left to move her. He was trapped below with the nauseating stench.

“See? All that effort, and you’ve ended up right back where you belong!” His Mom giggled. Then she sighed, and her voice became more soothing. “Oh, honey. I get that this is an adjustment for you, but to be honest… you’re a very average young man, who’d have lived a very average life. Your sisters, on the other hand, are strong, smart, determined – they each have the potential to become great women, do great things! And with their very own brother serving as their slave, one of them will be empowered to be even greater! Wouldn’t you rather worship your sister, and be a part of something incredible, than continue down your own mundane path of existence?”

Her son didn’t respond, but she didn’t need him to. His job was to sniff, not wax philosophic.

“Now then, let’s get started!” She announced, standing up. Jake, exhausted, slid slowly off the chair onto his knees.

“Great, you’re already in position!” She laughed. “Next you’re going to plant your face in my ass, and keep it there while I walk around the house. OK?” She paused, but her son lay unmoving, still in recovery. “…lesson 1. Your Mistress should never have to repeat herself. Face in ass, now, or I’m holding down the shock button until you do.”

That got him moving. Jake immediately lurched forward, pressing his nose into his Mom’s crack. Her last fart was still baked into the fabric, and he moaned as he took several unwilling whiffs of the stench.

“Good job, sweetie! Now stay there until I say otherwise.” With that she began to walk, heading for the kitchen. He found it difficult to keep up; shuffling on his knees was arduous, and while his Mom didn’t rush, she also made no effort to slow down on his behalf. He was off-balance, too, and had to hold onto her hips just to stay upright.

“Here’s a tip, Jake: lean into my ass for support. You’ll find it much easier to stay balanced!” She was right, but he didn’t enjoy pressing himself even further into her smelly rear.

Before they’d walked more than a few steps, his mother broke wind again.

Bbbpprrrbtpbrbrppbtptrbpt

Her second rancid blast bubbled noisily from between her cheeks and into Jake’s waiting nose. It was sharp and intensely bitter; he retched instantly on the foul odour and instinctively jerked away, releasing his Mom’s hips and falling to his hands and knees. There he was not given long to contemplate his mistake.

Bzzzzzzzzzzzzzzzzt!

Jake’s back arched involuntarily as another agonising bolt of electricity surged through him, punishment for failing to keep his face in her crack. The moment it ended, he came to his senses and thrust himself back up her butt, desperate to avoid further shocks. His Mom smiled at his “eagerness”.

“I did warn you, honey. Hopefully now you’ll be a little more prepared next time I have to fart!”

They continued into the kitchen, his Mom walking over to and stopping at the sink. Jake, who could see nothing but… well, butt, kept moving forward until he walked right into it, springing off it lightly. He heard water running, then the soft clinking of dishes and cutlery. “She’s doing the washing up,” he realised. She was just going about her everyday household chores with her son’s face in her ass, as though there was nothing at all unusual about it.

Ffffppppppppppssssssssssssssssssssttttttt…

Suddenly she released another fart, this one long and airy. It hissed out slowly, like air gradually escaping a tire. This time he was ready for it.

He fought his body’s natural instinct to flee and kept his head firmly inside his Mom’s crack even as her gas sprayed his face. The intense stink burned his nostrils and brought tears to his eyes, and he couldn’t hold back a series of gags; but somehow he endured, and managed to keep his head perfectly still.

“Good boy! That’s much better!” His Mom encouraged, patting the back of his head. Then she sniffed the air and frowned. “Hm… There’s some room for improvement, though. Lesson 2, Jake: if your Mistress can smell her own fart, it’s because you aren’t inhaling it properly. Next time take nice, long, deep sniffs from start to finish, OK? I’m sure I don’t need to tell you what the consequence will be if you aren’t making the proper effort.”

Jake’s neck still stung from the last shock. He had no choice but to quietly whimper his assent.

*

The rest of the day passed torturously slowly. Jake followed his mother everywhere she went; whether she was cooking, cleaning, doing the laundry, watching TV, or even at one point answering the door to sign for a delivery, her son’s face remained practically glued to her ass.

While he made the occasional mistake, and received a few more shocks for them, Jake’s performance as a fart slave improved rapidly. He made certain he never flinched at his Mom’s gas again. In fact, he sucked it up so efficiently that she showered him with praise, calling him her “little fart vacuum!” and declaring that this was the job he was clearly born to do. The compliment did little to lift his spirits.

She also had plenty more lessons and advice to help him with his duties. She trained him to listen out for her stomach’s gurgling, and to feel the subtle tensing of her cheeks, to anticipate incoming farts. He learned to flare his nostrils for deeper sniffing, and to open his mouth to swallow blasts too big for his nose alone to handle. And most importantly, he was taught to show appreciation for his mistresses’ “gifts” by kissing her butt after each release.

“Of course, these are all just guidelines.” His Mom remarked as she enjoyed her lunch, a delicious 3-bean salad. Jake lay on the sofa beneath her, his mouth open wide. He would be eating her farts.

“Every mistress is different, and will have their own rules for you to learn and obey. Even names can be tricky! I personally don’t mind you calling me “Mom”, but your sisters might prefer something more respectful. You should refer to them as “Mistress” or “Goddess” to be safe.”

Brrrrrrrrrrooooooooorrrrrrrrrraaaaaappppppp!

The fart echoed inside his mouth and coated his tongue with the taste of spoiled milk. It took him 5 swallows before he’d “eaten" the entire cloud, but the flavour wouldn’t fade for at least another hour. Once finished, he dutifully puckered up and kissed the seat of her pants as thanks for his rancid meal.

“Mmm, that was tasty.” His Mom said as she finished her plate. She set it aside and let out a satisfied belch. “Oops, wrong end! Now then, shall we resume your training?”

The day continued to drag by in a smelly, fart-induced haze, and to Jake it felt like it might never end. But eventually the sky outside began to darken, all his Mom’s daily chores were wrapped up, and she finally announced it was time for them to go to bed.

They walked together up the stairs, his Mom’s cheeks grinding on him with every step, as though her ass was trying to eat his head. He had foolishly hoped that he might get a break at night, maybe even being allowed to sleep in his own bed, but those dreams were quickly dashed.

Her ass led him past his room and into hers, where he was directed to sit on the end of her queen-sized bed and wait for her to get changed.

“Y-you know Mom, I’ve been thinking…” He swallowed nervously as he watched her get undressed. “If I slept in my own bed tonight, I'd probably be much better rested for tomorrow. Then I’d find it easier to perform my… duties. So I… I think I’d definitely prefer to be in my own room.”

She laughed at that. “I bet you would! But Mommy gets very gassy in her sleep, and I don’t want you missing any of my night-time gas.” She pulled on an oversized T-shirt and a pair of tight-fitting pajama bottoms. “Besides, you need to get used to sleeping with your head up your mistresses’ ass, because I guarantee your sisters will expect you to.”

“B-but Mom – ”

“And look, sweetie! I modified these just for you!”

Jake gasped in horror as his mother turned around and bent over, showing off her gigantic bum. Cut into the seat of her pajama bottoms was a circular hole, roughly the size of his head, that exposed her naked ass-crack!

“It’s like a little window into my butt!” She beamed, giving her ass a slap. “This way I can still wear my comfy pajamas, and you get to sniff my farts completely unfiltered!”

Jake wanted to cry. The thought of spending an entire night up there was so disturbing that he almost tried to run again, despite knowing his collar made escape impossible. “She wouldn’t really force me, would she?” He looked up at his Mom and met her eyes, deciding to make one last desperate attempt to appeal to her caring side.

“Mom, please…” He whispered. “I don’t… I don’t think I can do this.”

“Oh, honey.” She walked over and held his hand, her touch warm and comforting. He began to calm down, and looked up at her with wide eyes, searching for reassurance. “You’ll learn.”

Jake heard a click. He looked down to see that his Mom had just snapped a handcuff around his wrist; she held the other end and waved it, making his own arm rise like a puppet.

“Now then, let’s get you ready for bed!” Facing away from him, she guided her son to wrap his arms around her hips and try to bring them together at her stomach. He didn’t even come close – her ass was far too big – but luckily the handcuffs had an extendable chain.

Even at the maximum length, it was a close thing, and he had to wedge his face far into the “butt-window” for the chain to just barely connect his wrists. The final result was Jake effectively hugging his Mom’s ass to his face, his head imprisoned within her hot, stuffy pajama bottoms.

“A perfect fit!” She declared happily, then climbed into bed, lying down on her back. Jake braced himself as the weight of her body pressed down on him, slowly sinking into the mattress and concealing him deeper in her crack – not that there was much deeper he could go. He was already pressed far enough in to smell the pure, rich stink of her asshole. Any further and his nose would actually be touching it.

Finally she pulled the covers over herself and all trace of her son was concealed. An outside observer looking in would see only an attractive older woman alone in bed, with no clue there was a fully grown man bound beneath her, shackled by his wrists to her bottom.

“So, you’ve finished your first day, sweetie. Was it hard? Mommy’s farts are smelly, huh?” That much they could agree on. “I doubt you’ll have time to get used to mine, but I promise you’ll eventually grow accustomed to your sister’s, whoever you choose. In time you might even learn to love them!”

She relaxed back into her satin pillow and patted her stomach, which responded with a low rumble. Her evening snack of cheese and crackers would soon be taking effect, it seemed. “I know it’s tough, but I want you to understand that this isn’t all just for your sisters. Of course, I want them to have the best lives possible – but serving them will be good for you, too. One day you’ll realise that this is your calling, your one true place in life… and that’s something very few people are lucky enough to have.”

With that she turned off her bedside lamp and settled down, ready for sleep. “Goodnight, Jake. Try to get some rest! You have a big day with your sister tomorrow.”

A few minutes later she was fast asleep, her ass rising and falling rhythmically around Jake’s face. “Rest…” He thought to himself miserably. How was he supposed to get any sleep with this awful stench surrounding him?

The answer came to him shortly.

His hands felt it first, chained tight around his Mom’s belly. Her gut gave an angry growl that resonated against his palms, and a few seconds later –

Pprrrrrrrrrooooooooooooooorrrrrrrppppppppppp

“Ugghh…” He groaned, eyes stinging. Night-time gas. This was the first time he’d received a fart direct from the source, with no clothing to obstruct its path, and the difference in power was immediately obvious.

He felt its heat warm his face, and the force of wind blew back his hair – but the biggest difference was the smell. It was truly sickening, bad enough to turn his stomach. His entire body shuddered as he forced himself to breathe it in, and only fear of punishment prevented him from crying out in disgust.

Brrrrooooooaaaaat…

Another fart quietly added to the stench. Jake’s training kicked in, and he flared his nostrils to absorb it, but he hadn’t yet learned to handle stink this potent. He started to feel woozy, and each breath made him a little more light-headed. “I’m going to pass out,” he realised.

As he began to slip into blissful unconsciousness, Jake thought about the nightmarish day he’d endured, and wondered whether the next day would be any better. He didn’t even know who he was serving, it occurred to him. He hadn’t seen the rota. But that would just have to be another nasty surprise for him to discover tomorrow. For now, a final, sulphuric s.b.d pushed him over the edge and he drifted off entirely.

His first day of fart slavery was over. The rest of his life, was only just beginning.

Tuesday

Bbbbbbbbbffffffrrrrrrraaaaaaaaarrttt!

Jake’s eyes shot open, heart pounding, as yet another fart blasted him awake. In his sleep-deprived state it took him a moment to remember where he was, but the smell soon reminded him.

He was still chained by his wrists to his Mom’s colossal ass. And for what had to be the hundredth time since they’d gone to bed, he had suffered a rude awakening courtesy of her rotten-smelling gas.

“Ughhh…” He moaned quietly, as the fart filled the tiny space in her crack not occupied by Jake’s head – his only available air. Oxygen was rapidly being replaced by sickly, cheesy methane, but he forced himself to inhale it anyway. He’d been suffering in her stink all night. By now, he knew only way to get any rest was to take deep, slow breaths until the stench knocked him out.

That had been his constant cycle for the past few hours. Sleep, be woken up by his Mom’s rank butt-bombs, sniff until unconscious, sleep, repeat. It was not very restful, and made the night seem to stretch out into an eternity.

But… something seemed different this time. The pressure on his head increased, as though his Mom had sat up slightly; and though it was hard to hear under a mountain of butt-flesh, he thought he could make out the sound of speech. “…gassy…” “…probably tired…” He strained his ears. Was she talking to someone?

Abruptly he felt the covers above him lift off, and he shivered at the sudden cold. A hand grasped his wrist and fiddled with it – a moment later, his handcuffs were removed, and his arms fell limply to either side. Finally, the incredible weight of his Mom’s ass tilted to the left, and the bright light of day stung Jake’s eyes. The long night was over! He was free!

“Good Mooooooorning!” A voice greeted him, its owner crouching down to meet his eye level. He recognised the over-excited tone even before his vision adjusted to see her face.

“…Ashley?” He croaked.

“Guess who’s ass you’re gonna be worshipping today, bro!” His youngest sister’s enthusiastic grin swam gradually into focus. “I hope you’re ready – ” She pulled back suddenly, sticking her tongue out in disgust. “Ewwww! Man, I think we’re gonna have to wash you first. Can’t have my slave smelling like somebody else’s butt!”

“Good Morning, Jake,” yawned his Mom, stretching while allowing him to crawl out from beneath her. “Did you rest well? I was out like a light – I can’t remember the last time I had such a good night’s sleep!”

“Well he’d better have gotten some rest, cause he’s seriously gonna need his energy today. Hear that, bro? I’m not going easy on you!”

Jake slid off the bed and onto the floor, where he collapsed into a tired heap and looked up at his sister. She was wearing a crop-top and booty shorts (in fact, they looked like the same booty shorts as yesterday), and somehow already seemed to be sweating despite how early it was. Ashley almost never stopped moving; even now she tapped her foot impatiently as she waited to claim her prize.

“You may not want to push him too hard, honey.” Their mother cautioned. “We don’t want him to break before your sisters have had a chance to use him, do we?”

“Relax Mom, I’m not gonna hurt him. So long as he behaves.” She patted his head condescendingly. “Now come on bro, we’ve wasted enough time! Let’s go get started!”

With that she was off, already halfway across their Mom’s room and heading for the door. Jake watched her go from the floor, still too exhausted to move… until he heard his collar beep. Only then did he spot the device in his sister’s hand. She had his remote with its proximity trigger, and was already almost out of range!

“Have fun, you two!” Their Mom chuckled as he scrambled hurriedly after her. “And Jake – just remember what I taught you and you’ll be fine, sweetie!”

His sister was waiting for him out in the hall, arms folded across her chest. “First things first, bro,” she said. “I wasn’t kidding about the smell. You fucking reek! Let’s go to the bathroom and we’ll get you cleaned up.”

That was the first order Jake was actually happy to obey. “Yes, Ashl – Mistress Ashley,” he quickly corrected himself.

“Oooh, “Mistress”! I like that! Mom trained you well, huh? I hope you learned to sniff ass as well as you seem to kiss it!”

The chance to wash his face was one Jake greatly appreciated, though he wasn’t allowed much time to enjoy it. He only managed to clean off the surface of his face before Ashley began hinting about her “itchy trigger finger”, and he was forced to leave with the inside of his nose and mouth still tainted by his Mom’s filth. Then she bade him follow her, and the pair made their way downstairs.

“So as you know, I usually like to start my day with a morning run. It gets me nice and sweaty, and usually makes me pretty gassy too, so obviously I want you with me for it – but I can’t just go jogging around the block with my brother’s head up my ass!”

Jake breathed a quiet sigh of relief. He’d been afraid that’s exactly where she was going with this.

“Yeah, impracticality aside, I’m pretty sure the neighbours would ask questions. But don’t worry! We’ve been planning this week for a while, and I bought something special so you don’t have to miss out!”

He followed her down not just one flight of stairs, but two, as Ashley led him into the basement. There in the middle of the room stood a piece of equipment he’d never seen before. A brand new, state-of-the-art treadmill!

“Ta-da! Isn’t it great? It arrived yesterday, while you were busy getting intimate with Mom’s ass.” She clapped her hands happily. “Now I can enjoy my run and smother you at the same time! Come on, I’ll show you!”

The support bars on either side of the treadmill both had straps attached that would ordinarily have looked out of place, but from recent experience Jake had a feeling he knew exactly what they were for. Sure enough, he was made to kneel at the back of the machine while Ashley locked them around his arms; then she stepped lightly over him, grabbed him by the hair, and forced his head into her crack.

“Oh woooow, that feels nice. You’re such a good fit, bro!” She cooed. The material of her booty shorts was extremely thin, and allowed his face to burrow deep between her cheeks. They felt incredibly soft and bouncy as they rubbed against him, but that was about the only pleasant sensation he experienced. The smell of salty ass-sweat and earthy butt-funk completely dominated every other sense… and he knew it was only going to get worse.

“Ok, so your arms are secure… head’s in position… your knees are off the belt… I think we’re good to go!”

Ashley pressed a few buttons on the treadmill and the belt began to move. It was slow at first, but gradually started picking up speed; soon she was up to a light jogging pace, and Jake found himself bobbing his head up and down to keep himself centred in her butt.

A minute or so later she had sped up to a run, and Jake’s already unpleasant situation was quickly becoming unbearable. She was starting to sweat hard. He could feel damp patches forming on her cheeks, the liquid permeating through her shorts and sticking to his face – but the worst spot was her crack. Sweat ran down it like a river to form a puddle right under his nose, and the air he inhaled became humid and salty.

Her ass-sweat was already so gross, he forgot how much smellier things could get.

Fffffffffffffrrrrrrrrrrrrrrrrrrraaaaaaaapppp

Jake gagged as a high-pitched fart squeaked up his nostrils, flooding them with the scent of rotten eggs! It was absolutely brutal, rich and sour; thanks to Ashley’s healthy diet her gas was practically a biological weapon. After just a few breaths it became too much, and he started to shake his head in disgust.

“Head still, bro.” His sister ordered without looking back. That was the only acknowledgement she gave him. She was utterly focused on her run, paying her brother minimal attention. It was enough to keep him in line, though, and he quickly settled back down, returning his nose to the correct position.

Ffffffffffffffoooooooooorrrrrrrrrooooopssss

…just in time for another dose of gas. This one was even smellier than the last, but he made sure to stay calm and sniff deep. He had a feeling if he distracted her again, he’d be receiving more than a warning for it.

Time dragged on. The siblings spent almost a full hour like this, Ashley ripping gut-churning farts on him all the while. His sister’s stamina was impressive. As time passed, she only seemed to speed up despite how hard she was pushing herself… and something weird started to happen to Jake, too.

Even though Ashley was the one running, he also found himself strangely out of breath, as though fighting to keep his head up her bum was his own special workout. As a result his breathing became heavy. He was forced to take long, deep inhales almost directly from his sister’s sweaty backdoor, filling his lungs with more and more of her repulsive odour with every passing second! He began to feel physically ill. “How much longer is she going to run?” He worried.

Brrrrrrt! Blp! Brp! Fttt! Frrrrrrrrrrrrrrrpppp!

Ashley suddenly released a series of short popping farts that burst against his face with each bounce of her butt. Jake, panting heavily, took full, square breaths of each one – and retched. He had never inhaled gas so deeply or completely before, and the stink took its toll on his body. It was too much! He was moments away from panicking and attempting escape.

But mercifully, his sister was at long last finished. She tapped a few buttons and the treadmill began to power down. As the belt slowed, she stopped moving and let it carry her backward into Jake, who was in turn pushed back until he was stopped by his arm straps.

“Phew! That was an intense workout, huh?” Ashley gasped. Her skin was red and glistening with sweat. “I pushed myself extra-hard today! It must be because I have you supporting me, bro. Literally!” She laughed, lifting her legs up so that she was sitting fully on his face. She then took advantage of the moment to force out another ripe blast.

Fppppppraarrrrrrppp!

“Oh, and that reminds me!”

Bzzzzzzzzzzzzzzzzt!

Jake spasmed wildly, his collar sparking electricity even as his senses were attacked by the smell of digesting vegetables. Another shock! But what had he done wrong?

“…why?” He wheezed, once the pain and stink had faded.

“Don’t play dumb, bro. Mom told me about how she was training you yesterday, so I know that you know you should’ve been kissing my ass after every fart. I didn’t feel a single one! Were you hoping I didn’t know about that little rule?”

Jake cringed. In truth, he’d remembered after the first couple of farts. But as Ashley hadn’t said anything, he’d thought he’d gotten away with it, and decided to just continue ignoring his duty. That, it seemed, had been a mistake.

“I’d say that's a good 30 or so ass-kisses you owe me. Should I give you a shock for each one? Or are you going to start paying them back?”

He didn’t need to be told twice. He puckered up with zero hesitation, planting a long, deep kiss against his sister’s cheek with an over-the-top “mwah!” noise; when finished, he immediately turned to her other cheek to repeat the process.

“Haha, good boy!” Ashley giggled. “C’mon, let’s go upstairs. You can finish your kisses while I fix us up some breakfast!”

He crawled behind her as instructed, peppering her ass with kisses all the way up the stairs, through the hall and into the kitchen. He delivered her 30 smooches as promised but didn’t stop there. He made sure to pay back his debt with interest, continuing in the hopes of getting on her good side.

He was deliberately humiliating himself, he realised. He was willingly throwing away his dignity and moulding himself into the perfect little ass-slave… but it was better than being electrocuted.

While Ashley stood at the stove, humming happily and tilting a pan as it sizzled away, Jake was still at his worship. He only stopped when he felt his sister tap him on the head, and pulled back to see her holding two plates, a delicious golden omelette on each.

“All that hard work really works up your appetite, huh?” She smiled. “I bet you must be hungry!”

“…Starving,” he admitted. He hadn’t eaten anything since starting his training – although to be fair, he’d felt so sick yesterday that the thought of food hadn’t even crossed his mind. Now, though, with this delectable, lightly seasoned, golden-brown treat dangled before him… his mouth watered, and he reached out toward it.

“Nuh-uh, not yet, bro! It’s missing the final ingredient!”

“Huh?”

Ashley whisked his dish away with an evil grin. He was forced to watch, helpless, as she brought it behind her back and lowered it to her ass; then, with a cute little grunt, she unleashed hell on his poor, unsuspecting breakfast.

Bbbbbbbllllllllllaaaaarrrrrrrrppppaaaaaaaarrrrrrrffff!

His delicious meal was spoiled in a matter of seconds. The sheer force of the fart blew off most of the herbs on top, droplets of ass-sweat replacing the seasoning, while a nauseating stench erased all trace of the food’s once-pleasant aroma. Ashley held it in place for a while, letting it soak in the flavour, and gave it a quick wipe up her crack for good measure. Then she brought it back around to her awaiting brother.

“Breakfast is served! Mmm, smells good, right?”

Jake looked down at the tainted dish, then back to his sister. “Ashley, please…” he started.

“That’s Mistress Ashley, and I wanna see you eat every bite, bro. Come on! If it gets cold, I’ll warm it up again for you!” She winked.

Jake resigned himself to his fate. His sister watching expectantly, he picked up the omelette, brought it to his mouth, closed his eyes… then bit off a small morsel, and began to chew.

It was vile. There was, somewhere, some hint of the original tasty flavour – but it was almost entirely lost, buried beneath Ashley’s bitter ass-gas. The beaten eggs had absorbed her fart like a sponge in water. Every slight movement of his tongue subjected his tastebuds to the aroma of her bowels, and he had to fight his own gag reflex just to swallow.

And all that was just one bite.

“Yum yum! Good boy, now keep going!” Ashley praised him, picking up her plate to enjoy her own (uncorrupted) omelette. She took her first bite and made a small noise of approval. “Oh man, that’s good. And so healthy for you, too!” She spoke with her mouth full. “Eggs are a great source of protein and vitamin A, and can help raise your levels of high-density lipoprotein. They’re packed with nutrition, and they make my farts fucking stink! Could you ask for a better breakfast?”

“…thank you, Mistress Ashley,” mumbled Jake, tearing off another disgusting chunk. This next bite was soggy with sweat.

“Aww, no problem, bro! Just wait – once we’re living together, I’ll make sure all your meals are like this. Healthy, filling, and covered in my own special flavouring!” She gave her ass a slap, and turned to let him see it jiggle. “Now hurry up and finish your food! This is the only one-on-one time we have this week, and I don’t want to waste even a second of it. You’ve still got a lot of sniffing to do!”

*

Jake’s time with his Mom yesterday had been slow, leisurely, almost relaxed in a weird way. Though no less torturous, Ashley’s pace was the complete opposite.

She raced around the house in a whirlwind, never in one spot for long. She was upstairs, downstairs, sitting, standing, stretching, running, jumping… it was like she was allergic to staying still!

It wasn’t until late evening that she finally began to wind down, and even then it was only after another marathon session on the treadmill; she somehow managed to push herself even harder than this morning, and generated so much sweat that Jake was practically water-boarded by her shorts. He was still panting hard into them by the time they made their way upstairs to Ashley’s bedroom.

There they lay on her bed together, Ashley lying on her stomach with her phone held out in front of her. She was watching some vapid Netflix show about spoiled rich families, while enjoying her brother’s hot, heavy breathing into her ass.

“God, are you still out of breath, bro?” She called back to him. “Do you need some air? Here, I’ll help you out.”

Fffffffffffpppppppppprrrrrrrrrrrrrooooooooopppp

“Hahaha! There you go, breathe that in! Did that help?”

It didn’t. The scorching, eggy wind blew straight into Jake’s mouth, causing him to choke until he’d swallowed it all. Once recovered he made sure to give his sister’s ass a dutiful kiss, but he was still gasping hard.

“Wow, you’re so out of shape it’s not even funny! Good thing you’ll be joining me for daily exercise from next week, we’ll soon get you fit.” He felt her adjust her position slightly before continuing. “So bro, how did you enjoy being my slave today? Must’ve been pretty gross, huh?”

“…Yes Mistress Ashley,” he wheezed quietly.

“Hmm, but you have been a good boy, overall. Ewww, is that because you secretly like it? Oh wait, hang on, get deeper!”

Jake did as he was told, pressing his face forward until his nose was flush against the seam of her shorts.

Brrrrrrrrrrrrruuuuuuuuuuuuuppppppppffffff

“Ahh, that was a steamy one! Deep sniffs bro, come on! What does it smell like?”

“Does she want a real answer?” His face was hidden between her cheeks, but Jake was cringing with disgust. As per usual, the fart was foul. It smelt like milk that had been left out in the sun all day. But that reply would probably not help his situation.

“It smells like… ugh… like roses…” he eventually replied.

“Haha, I knew it! You love my stinky little farts, don’t you bro?” She kicked her feet in the air. “I can’t believe he’s actually worshipping my ass. His nose feels so awesome! Remember to like and comment for more, guys!”

“Wait, who is she talking to?!” Jake looked up in alarm to see his sister holding up her phone – not to watch Netflix, but using the reverse camera to film them both! She was recording him sniffing her farts! He immediately panicked and started thrashing around, but a shock from his collar quickly had him settled back down again.

“Hahaha, calm down already! I’m not gonna post it anywhere. Yet!” She tossed her phone to the side and looked back at him, smiling. “I’m thinking of making some social media accounts to document our lives together once you’re officially my slave. Maybe we’ll go viral, and the whole world can see how devoted you are to my bum! How does the username “gas-addict” sound to you?”

“Mistress, please…” He kissed her ass again, hoping to persuade her. Just being her slave was embarrassing enough on its own. Having the entire world know about it would be a whole extra layer of humiliation!

“Like I said though, I’ll hold off until next week.” She continued, ignoring him. “In the one-in-a-million chance you pick Rachel or Natalie over me, they might not appreciate you already being my famous Instagram butt-boy. But that’s all for later! As for right now, I think it’s time we went to bed. One of the most important aspects of a healthy lifestyle is a regular sleep schedule, after all.” She lightly ruffled his hair. “Head up a sec, bro.”

It was an unexpectedly difficult order to obey. Ashley’s ass was so sweaty that Jake’s face had become slightly stuck to it, and he had to use both hands to pry himself free with a wet, sticky “shhlurpp” noise.

“Aww, did you two get attached?” His sister grinned, while reaching back to tug down her shorts. Her ass underneath simmered with heat; fat beads of perspiration rolled down her cheeks, and her (far too small) grey panties were covered in sweat patches. Jake grimaced as he looked down at it.

“OK, back in you go!” Ashley placed a hand on his head and guided him gently back down into her waiting crack. Nestled in deep the heat and stink radiating from her rear was incredible – it was like being in the world’s most disgusting sauna.

She didn’t stop there, either. She grabbed a thick leather belt and wrapped it around the back of Jake’s head, then secured it around her waist, strapping Jake tight against her body. He was trapped, just like the night before. But this time the rear he was tied to was far hotter, and far sweatier, making it torturous in a whole new way.

“Mmkay, you feel nice and snug…” Ashley muttered to herself, checking the fastenings. “I’m leaving your hands free as a special privilege, but don’t try anything stupid, bro. I’d hate to have to tape down the shock button on your remote all night.”

Finally she pulled off her shirt, flicked off the lights and pulled the covers over both of them. Her duvet was unusually thick and heavy; already his body felt uncomfortably warm beneath it, and his face fared even worse. Her hot, slimy cheeks rubbed against his on either side, baking him between them.

“So Jake, you’ve been my slave for a day! Sad to say your week is all downhill from here,” Ashley laughed from above the covers. “Aww, don’t worry though. I’m sure the other two will take good care of you, and you’ll be back in my crack before you know it. Just breath deeply and slowly, really savour the flavour of my gas… and I know you’ll make the right decision next Monday.”

Pppppplllaaaaaaaaaarppppppptt

“Aahhhh. Night bro!”

Ashley rolled over and began to drift off peacefully, a cool breeze from her open window keeping her at a perfectly comfortable temperature. Under the covers, it was a different story.

Her latest fart was not only rancid, it was blisteringly hot, and trapped beneath the duvet with two human bodies supplying their warmth… the heat was going to skyrocket.

Jake swallowed dryly. In this heat cocoon, Ashley’s ass would soon be sweating just as much as it had on the treadmill, or (likely) even worse. Pretty soon it would be unbearable. “At least her ass is comfortable,” he thought miserably as he tried to settle himself in.

A bead of sweat rolled off his sister’s buttock and into his mouth, salty and strong. It was his first of the night. But it would certainly not be his last.

Wednesday

“Jake. Pssst! Hey, Jake! Wake up!”

Jake’s eyes flickered open slowly. Delirious with heat and fatigue, it took him a moment to absorb his surroundings; he was still in his youngest sister Ashley’s bed, but he’d been (mercifully) unbelted from her ass. Now he found himself looking up at her as she gently shook him awake, smiling with her finger over her lips.

“Oh my God, finally!” She whispered. “Get up already, and do it quietly!”

“Whu…” He groaned. Even knowing the pain she could cause him, Jake was almost too tired to obey. He’d just spent the entire night sweltering in her ass-crack, cooked in heat trapped under her duvet – and roasted by her sporadic, fiery bursts of flatulence. His head was so drenched in sweat, he wasn’t even sure which was his and which was from his sister’s ass… at least until some dripped into his mouth, and the rancid flavour gave it away.

“Get up!” Ashley insisted. “I’m supposed to be handing you over to Natalie today, but I thought if we woke up early we could do one last session on the treadmill together. Let’s go have a final, super intense workout to really leave a lasting impression on your nose!”

Jake’s heart sank. “No… Mistress, please…” He was so exhausted he wasn’t sure if he could stand, let alone endure another treadmill run – but one look at her face told him exactly how little choice he had. He whimpered and wiped sweat out of his eyes, then crawled off his sister’s bed and knelt obediently at her feet.

“Good boy!” She beamed, heading over to the door. “Now try not to make too much noise. We don’t want to wake up – ”

“Good morning, Ashley.”

“Nat!” Ashley almost screamed in surprise. There standing in the hallway, arms folded and a wry grin on her face was Natalie; the middle sister of the family, and Jake’s mistress for the day. “I, uh – m-morning! What are you doing up?”

“Well, I just couldn’t wait to take possession of my slave,” Natalie replied. “…and also, I had a feeling you might try something like this. You’ve always been one to bend the rules a little.”

“Haha, alright! I’m caught red handed, I guess,” Ashley laughed. She tossed Jake’s remote over to her sister, officially transferring his ownership. “Mind if I give him one more for the road?”

“Be my guest.”

Ashley grabbed her brother by the hair and rammed him hard against her ass. Jake already knew what was coming next. He closed his eyes and braced for impact.

Ppppppppppppprrrrrrrrrrrrrruuuuuuuppppppppp

Flaring his nostrils, he sucked the spicy fart deep into his lungs. It was thick and meaty; he could almost taste the high protein diet that had gone into producing it. Still holding his hair, Ashley smeared his face up and down her crack until she was satisfied her stink had rubbed off onto him, then finally dropped him and walked past her sister to the stairs.

“He’s all yours, sis!” She said cheerfully as she left. “Try not to miss my butt too much, bro. I’ll see you again in a couple days!”

With that she was gone, leaving Jake and Natalie alone together. His new owner looked down at him and smiled. “Rough night, huh? Come on, let’s head to my room.”

Natalie set off down the hall with her brother following close behind. He shuffled after her, still on his knees; partly due to tiredness, but mostly because he was sadly aware that this was the position she’d likely want him in anyway.

Once inside her room, she shut the door behind them and turned to inspect her new property.

“Hmmm,” she hummed, tapping her chin thoughtfully. “Those two have done a number on you… Ashley especially, I’ll bet. You look like shit, and you smell worse. Here.” She tossed him a damp cloth to clean with.

“Th-thank you, Mistress Natalie!” He said sincerely, immediately setting to work scrubbing the filth off his face. His sister didn’t reply, but continued to study him, taking note of his clear signs of fatigue.

“I’ll tell you what,” she eventually announced. “I’d prefer to have a more alert slave serving me today, and I’m not feeling especially gassy just now anyway. How would you like a little extra sleep before we get started?”

He looked up at her with round, wide eyes, making Natalie giggle. “I’ll take that as a yes,” she smiled, walking over to and patting her bed. Jake climbed in as directed, weary but excited, and ready to immediately collapse – but he wasn’t allowed to just yet. “Hang on a second.”

Jake watched as his sister undressed in front of him, pulling off first her leggings, then panties, which she held up to him with a smile. Before he could react she bent down and wrapped them around his head, the crotch running vertically up his face with a brown stain directly under his nostrils.

“No squirming!” She warned him, as he started to do just that. “If you want a rest, that stays on.”

He settled down and started to take slow, deep breaths through his nose, trying not to think about the stain he was sniffing and what must have caused it. The smell was strong, earthy and acrid, but… soft, somehow, not like the sharp tang of raw ass or a fart. It was still repulsive, but his inhales went down smoothly, helping him relax. His exhaustion soon began to catch up with him and he felt his eyes grow heavy.

“That’s it. You just keep smelling those while you have a nice little snooze, Jake,” Natalie said, placing some other worn clothes around and on his head for good measure. “Keep enjoying that little taster, and when you wake up, the real thing will be here waiting for you…”

The sound of her voice slowly trailed off as Jake fell into a deep, relaxing sleep. As his body received its first proper rest in days, the thick aroma of ass continued to soak into his nose… and mind. While he enjoyed a peaceful slumber, blissfully unaware, her scent would be working its way into his subconscious.

*

When Jake awoke a short while later, he did so with the luxury of having no ass in his face. An increasingly uncommon event in his new life. He was still wearing his used panty mask, however, and when he yawned he filled his lungs with the scent of the countless stale farts absorbed by the cotton. Naturally he coughed.

“Ah! Good morning, again.” His sister was sat at her desk nearby, and looked up from her laptop at the sound. “How are you feeling?”

“…better… thank you,” Jake mumbled. In truth his ears felt a little funny, and he remembered having a weird dream. There had been… chanting, or something? But he couldn’t deny he felt a lot less tired. “How long was I asleep?”

“About 3 hours. I nudged you a few minutes ago to stop you entering another REM cycle, so hopefully you shouldn’t be too groggy.” She stood up and walked over to him, collecting all her dirty laundry and removing (to his great relief) the panty mask. “And now I bet you’re pretty hungry, right?”

From her desk Natalie picked up a tupperware box containing a couple of pancakes. Jake eyed it nervously. After yesterday’s stomach-churning meals, he was wary of what “flavouring” she might add before he was allowed to eat… but she handed him the box without any tampering of the food inside.

“Relax, I’m not going to fart on it,” she smiled. “Just eat. You need to keep your strength up.”

Jake returned her smile with a wave of relief; Natalie was already proving a kinder mistress than Ashley had been. He removed the lid on the box and picked up a pancake, then brought it to his mouth and bit into it without hesitation.

And retched.

“Sorry, I should’ve said “I’m not going to fart on it… because I already spent 4 hours farting on it yesterday”,” Natalie said casually, picking up her notepad while her brother convulsed. “I want to see how much the flavour of my ass is retained over time, so I can’t skew the data with fresh farts just before you eat. So? How does it taste?”

He just shook his head, gagging. The flavour had most definitely been retained; ass and gas were practically all he could taste, with only a hint of the original pancake detectable underneath. It reminded him of the disgusting toothbrush event of 2 days ago, but this was about 10 times worse.

“Pancakes were a good choice, I think,” Natalie smiled, jotting down her “results”. “They’re very moist and porous, allows them to soak up more of the flavour. Which would you say you can taste more: my ass-sweat or my farts?”

Jake finally choked down his mouthful and gasped for breath, eyes streaming. “…your farts, Mistress Natalie…” He croaked. “Please… I can’t eat any more.”

She raised an eyebrow. “You can, and you will, because I’m your mistress and you do what I say. Do I need to remind you who’s in charge?” She held up his remote. “I’m not deliberately cruel, Jake, but don’t mistake that for weakness. Any more disrespect and I won’t hesitate to punish you.”

He hung his head shamefully. “Yes, Mistress. I’m sorry.”

She nodded. “That’s better. Oh, and if you think this is bad you should brace yourself, because your lunch was in my ass-crack for 8 hours and your dinner got a full 12 all last night.” She giggled as she watched the colour drain from Jake’s face. “Now come on, next bite. What adjectives would you use to describe the taste?”

It took Jake a further 25 minutes to fully consume his repulsive, soggy breakfast (these words came more than once when he was asked for descriptions). Once finished, his sister gave him no time to recover before declaring he’d had enough of a break. It was past time his servitude began.

“Kneel down over here,” Natalie ordered, pointing to a spot in front of her desk while she moved her perfectly functional chair out of the way. “I need a seat while I work, and from what I’ve heard your face makes a very comfortable cushion.”

He moved quickly, and the second he was in position his sister walked over to test him out. Jake watched nervously as her large, grey leggings-clad butt descended toward him, appearing to grow the closer it got. As she made contact, and the pressure on his head increased, he braced his arms against the floor behind him to support her weight; but her ass was heavy, and he still felt his body sag slightly.

“Mmm! You are comfy!” Natalie made an impressed noise, bouncing her butt up and down. Jake groaned painfully as his nose was driven further up her crack, now just far enough in to detect a natural, earthy aroma. “Now then, let’s move on to the main event.”

Ffffffffffffffftttttttttttttt

His middle sister’s first face-fart. A quiet, airy gust of wind rushed out to meet Jake’s nose, and he sucked it up as he had been taught. It wasn’t as forceful as Ashley’s farts had been, but was still punishingly foul – he gagged once as he absorbed the unfamiliar flavour, before giving her ass its obligatory kiss.

“I actually started to feel gassy about an hour into your nap, so I’ve been holding these in for a while,” said Natalie. “In other words, you have something of a backlog of farts to sniff.”

Btttttttttpppppppptt

As he drank deep of another bubbly blast, Jake felt his body begin to waver. He could sniff up his sister’s gas, or serve as her seat – but not both simultaneously. The stink was weakening him. His arms wobbled, and he could tell they were only moments from giving way.

Fffprrf

“Mistress – !” He started. That was as far as he got. He collapsed backward, his sister coming after him ass-first; he slammed into the ground painfully only to be immediately crushed by her butt. Natalie was fortunately unhurt, his face having cushioned the blow of her fall.

She sat unmoving for a moment, looking down on her brother’s crumpled form. “Disappointing,” she muttered, picking up and priming his shock remote… only to put it back down again with a sigh. “I suppose it isn’t really your fault you’re so weak. You’ve only just become a slave. In the future we’ll need to put work into improving your endurance, but for the time being I think I have a solution to this chair problem.”

While Jake struggled back to his knees, Natalie went to work. There were two specially prepared hooks mounted to the ceiling above them; by standing on her (actual) chair, she was able to attach strong nylon cords to both that dangled down almost to the floor. She then clipped metal bracelets around her brother’s wrists and secured a cord to each, before shortening them so his arms were forced up into the air. Jake had just become a human swing.

“Perfect!” Natalie smiled, standing back to admire her handiwork. “Now your endurance – or lack thereof – won’t cause us any more issues.”

“Huh?..” Jake mumbled, still a little dazed. His sister paid him no mind. Earlier she had taken care not to sit on him too quickly or heavily, but this time she made no such considerations; she dropped onto his face exactly as she would with any other piece of furniture.

“Mmnngg!” The force of Natalie’s butt-drop was considerable. Jake’s arms and neck strained and he grunted with pain… but the cords held his body firmly upright. The only movement he could make was to sway slightly back and forth.

“Looks like you’re holding. Great!” Natalie shifted her weight, getting her brother’s nose as deep as possible. “Now that you don’t have to worry about failing to hold me up, you can focus all your attention on breathing in my gas. I’m going to be busy for a while, writing my first report on “The Effects of Continuous Fart Inhalation on the Human Body”, so I don’t want any distractions.”

Brrrrrrrrrrruuuuuuummmmmmmmppp

“Ahhh. Oh, and get comfortable, because we’ll probably be here a while. After all, I’ll be generating new data even as I’m writing!”

Fppprff

*

Jake spent most of the day serving as his sister’s chair. It only took her about 2 hours to type up her report, but she continued to sit on him long afterward: browsing the web, watching a documentary, reading a book, eating lunch (with a quick break to force-feed him his), practising the violin… and of course, farting the entire time.

He was released only after they had both had dinner, which for Jake took quite a long time. 12 hours in Natalie’s ass had completely flattened his burger and saturated every last inch of it with sweat, gas, and worse; each bite seemed to explode with ass-juice and release a pocket of trapped air, like a mini-fart inside his mouth.

“Obviously once we’re living together, I won’t be able to flavour your meals like this,” Natalie mentioned while he choked. “Because my ass will be entirely occupied by your nose. We’ll have to find someone else to help out. Rachel or Ashley, possibly? Or Mom? Maybe all 3!”

By the time she let him down, Jake’s entire body was aching – his wrists, arms and neck especially so. He thanked his mistress with grateful foot kisses, relieved to be free at last. If he had only known what was coming next he might have begged to keep being her seat.

“I want to gather more raw data. We need numbers,” said Natalie. She had instructed Jake to wait in the middle of the room, so he watched as she walked over to her closet and opened it to search inside. “We’re going to start tracking the smelliness of my farts over time. And to help with that, I have this.”

She brought out a clear plastic box a little over a foot in width and set it down on the floor next to him. There was an adjustable circular hole in one of the sides; he was made to lie on his back and force his head through, after which it was tightened firmly around his neck. His head was now entirely trapped inside the box, and he found himself looking straight up at the ceiling through its only other hole… and his only ventilation. He started to get a very bad feeling.

“I call this “The Fart Box”, for reasons that will shortly become apparent,” said Natalie, standing over him with her hands on her hips. “Your part is pretty simple. Just sniff up everything I give you, and rate the stink out of 10. Ready?”

“Uh – n-no! Wait, please!” Sadly, his sister’s question had been rhetorical. She sat down on top of the box, her ass completely covering the hole less than an inch above him, and the smell of her crack slowly began to filter down.

Inside it was extremely claustrophobic. The box was small, and with Natalie sitting on it, dark. Jake’s breathing quickened. He wasn’t sure what made him more uncomfortable – how little air he currently had, or how much he was soon about to.

Ssppptttrrrrarfffff

“Ugh…” Jake moaned. Ordinarily he took his sister’s gas straight in the face, and it would smell awful for a few minutes or so then start to dissipate throughout the room. In the box it was different. The stink billowed outward to fill up every available inch, then with nowhere else to go, simply grew denser. It just kept getting worse. Jake gagged, and couldn’t stop.

“Hey! Concentrate.” Natalie poked his stomach. “Give me a score out of 10.”

“It’s a… erk…” he retched. “Oh God!.. It’s like an 8!”

“An 8?” She sighed. “Please don’t be dramatic, Jake. I might not be able to smell it up here, but based on sound, length and heat alone I seriously doubt that was more than a 4.”

Ffffffffprrrrrrrrrrrrrroooooooooooooooooorrrrrrrrrrrpppp

“Aahhhh. Now see, that one definitely felt smellier coming out!”

She was right; this next fart was far worse. He felt its heat warm the tip of his nose just before filling it with the scent of rotting vegetables, beef and cheese. It was so awful he instinctively began clawing at the box for freedom, causing his sister to pin down his arms with her feet.

“Will you settle down? You’re not going anywhere!” She giggled. “Now, how bad is that compared to the first fart?”

It was getting hard to speak. “Tw-twice as bad…” he eventually managed.

“Twice? Ok, so if we’re saying the first was a 4, I can mark this one down as a tentative 8.” She paused, and Jake could tell that above him she was taking notes. “This is good progress. The more farts you sniff, the more accurately you’ll be able to rank their stink. Then in future we can try different things to see how it affects the results. Different diets, times of day, exercise routines – we’ll be able to find out exactly what gets those numbers highest!”

Jake was horrified. Not only was she going to make her gas as smelly as possible, she was going to force him to help her!

“Oh, I feel your next sample coming along,” Natalie said, patting her stomach. “Big sniffs, now!”

Pffffrrrrrrrrroooooooaaaaaaaaaaaaapppp

*

Jake spent the next hour and a half in the Fart Box, being blasted over and over with no breaks and without mercy. It was a unique sort of torture; by forcing him to rank their smelliness, Jake had to focus his senses on the distinct scents of each blast, making them seem even more sharp and pungent than usual.

Blllurrrrrrffffffffffff

“3…”

Grrrrrrrrooooooooooorrpppppp

“5…”

Ssspppppppppppuuuuuuurrrrrrrraaaaaaaaapppppttttt!

“Oh-oh God! 9! 9!”

He had no idea if his rankings were getting more accurate over time. But meanwhile above, Natalie had noticed an interesting trend in the data.

“Interesting. There are a few outliers, of course…” she muttered to herself as she skimmed through her notes. “…but on average the numbers are definitely starting to drift up. Does that mean my gas is already getting smellier?”

That would be great news, but she had to consider other possibilities before leaping to conclusions. It could be that her brother was developing a bias due to increasing physical and mental anguish as the session went on, or – more likely – lack of ventilation in the box was causing the remnants of un-sniffed farts to mingle together, creating a thick, pungent fog that Jake was smelling in addition the blasts he was ranking. That was hot, but not helpful for her experiment.

“More tests are definitely needed.” She decided. But for now, maybe he’d been through enough.

“Hey, Jake? Good news, we’re done!” She called down, then felt her belly rumble. Her stomach seemed a little angrier than usual… she couldn’t waste it. “…almost done! Just one more fart, Ok?”

“Yes Mistress,” Jake replied hoarsely, his throat dry from swallowing so much warm, dry air. He felt terrible. But knowing he was only one fart from freedom gave him a morale boost he sorely needed, and he renewed his resolve, ready to face this last challenge.

That resolve wavered, however, when he noticed Natalie shimmying down her leggings and panties. He was now looking up at her bare-ass as it covered the hole at the top of his box.

“M-mistress?!” He panicked.

“Sorry, this feels like a big one!” He heard her giggle. “I’m going to make the most of it.”

“B-but what about your data?” He tried desperately. “If I’m smelling this one in different – uh, uh – conditions! You can’t fairly compare it to the others? Right?”

“Hmm… you have a point,” she allowed. Jake breathed a quick sigh of relief, thinking he had saved himself. “Well, whatever. I have enough numbers already. This one can just be for fun!”

His eyes widened. “N-n-no! Wait! I – !”

Sssssssbrrrrrrrrrroooooooooooooooopppppppppppppprrrrrrrrfffffffffffffffffffff

Natalie’s bare ass unleashed a hurricane – by far her longest and foulest fart yet. The gas filled the entire box in a matter of seconds, and was still coming. Jake could see her naked anus pulse as it churned out endless waves of thick, sour, cabbage-scented stink. After one breath Jake was screaming, after three he was trying not to throw up; by his fifth he was already passed out, lying still in his smelly prison.

Natalie realised what had happened when his limbs suddenly stopped flailing and his screaming died down. She stood up quickly, turning to look down on her poor, unconscious brother. Knocked out by his little sister’s fart.

“Wow. I guess that one was a 10!” She chuckled, proud of her accomplishment. Then she sighed. “Ahh, but now my plans are ruined. We were just about to go to bed, and now look at you! Already fast asleep. I mean, I could easily wake you up…” she glanced over at the shock remote on her desk. “…but you look so peaceful… fine. I guess you’ve earned a break.”

She couldn’t move him without disturbing him, so her brother would spend the night right there on the floor. Natalie threw a light blanket over his lower body then removed the lid of the box – pinching her nose as her own fumes came rushing out – to place a pillow inside.

“I had a lovely new piece of equipment to test on you in bed, too,” she tutted. “Oh well. We’ll soon have as many nights as we like to try it. Just as soon as you choose me.” She picked up her panties, bathed in far more farts than they had been this morning, and wrapped them once again around Jake’s face so their smell could soak into his subconscious. Finally she placed some headphones over his ears and started the custom playlist she had made, then left her brother to his sleep.

“I suppose I should hit the hay as well,” Natalie muttered to herself. She began her evening routine, giving her room a quick tidy, changing into her pajamas and heading over to the bathroom; throughout, she couldn’t help feeling a little sad that her day was already over.

“It’s a shame I didn’t get to use Jake more,” she sighed. “But he needed his rest this morning, and he’ll definitely need it for tomorrow, too. He’ll be spending the day with Rachel, after all… I wonder what the odds are of her going easy on him?”

That thought, at least, gave her a little chuckle as she went to brush her teeth. She already knew the answer.

Next to none.

Thursday

“No, Jake. We’ve been over this.”

“But Mistress Natalie – ”

“It’s Thursday. Right now, you belong to Rachel. Just because she’s sleeping in doesn’t mean you get to slack off.”

Jake gulped nervously. It was early morning, his middle sister having just recently woken him (from another strange dream involving chanting and asses, weirdly) and already he was about to be delivered to his next tormentor. Knowing Rachel and how long she took to get up, Jake had hoped he might get a few extra hours to rest… but Natalie, in the spirit of “fairness”, refused to permit it.

“If, for some bizarre reason, you end up choosing Rachel at the end of this,” she continued, “You’ll probably spend every morning in bed worshipping her until she’s up. So that’s what you should be doing now. The whole point of this week is preparing you for what the rest of your life will be like, whoever you end up serving.”

“R-right, but – uh – I’d much rather stay here with you, Mistress Natalie!” Jake said. Maybe flattery would save him. “I could massage your… lovely… feet, or ass, or – ”

“Oh, is that so?” His sister smirked, seeing right through his less-than-subtle strategy. “Alright then, I’ll give you a choice. We can go to Rachel now, or you can spend another hour with me, in the Fart Box. Which’ll it be?”

Just the thought of going back in that box had Jake turning green. Natalie shook her head, laughing at the look on his face. “That’s what I thought. You’re still far too cheeky for a slave, Jake. Maybe I’ve been too lenient a mistress…”

The matter settled, Natalie led her brother out through the hall and into their older sister’s room. Rachel had made no effort to clean up in preparation for her day; the room was just as much a mess as always, and she herself was again lying sprawled out in bed with the covers half-kicked off. It was the exact same position Jake had found her in 3 days ago, just before his life had turned to shit.

“Rachel. Hey, Rachel!” Natalie called, poking her sister in the shoulder. There was no response except for another loud snore. Unlike Monday, this time she actually seemed to be asleep. Natalie sighed and turned to her brother. “Your turn, Jake. Climb up there and give her a wake-up call.”

Jake swallowed grimly, knowing what was expected of him. He climbed up from the foot of the bed, placing himself between his oldest sister’s spread legs, and moved forward until his face was only inches from her massive pantied ass. He gave Natalie a quick glance, and seeing her smile and nod in confirmation, he lowered his head to plant a kiss on the heaving cheek before him.

“Hmmm… Wuh?.. Hoozaht?”

Ffffffffffppppppppooooooooooooooffffffffffffffffff

As Rachel started awake she ripped a thick blast of morning gas right in her brother’s face. While he gagged, Natalie laughed, and took a step back in anticipation of the awful stink… but surprisingly, found it unnecessary. She couldn’t smell a thing. Jake must have perfectly absorbed the entire fart. “He’s getting good,” she thought, impressed.

“Good Morning, Rachel,” she said brightly.

“…Morning…” Rachel replied sleepily, propping herself up on her elbows. She was still half-asleep, but quickly gaining a grasp of the situation; she smiled slyly as she noticed Jake behind her trying to back away, and grabbed the back of his head to force him back down to her butt. “…Heh. Nice. Finally my day?”

“Yeah, just dropping him off for you.”

“Thanks.” She yawned. “…What’s the time?”

“About half nine.”

“Fuuuck. Way too early.” She fell back into her pillow, her eyes already closing again. “Yeah, thanks Nat. He’s good there, I’m going back to sleep.”

“Yeah? Do you want a belt or something, to keep him still?”

“Nah.” She lifted a leg and seized Jake’s head between her thick, trunk-like thighs, trapping him in the head-scissors he so hated. Then, while he gasped for breath, she rolled over onto her back to pin him under her ass. “He’s not going anywhere.”

“Haha, alright. I’ll leave you to it then. See you both later, Ok?” Rachel lifted a lazy thumbs-up in reply, already almost back asleep. Natalie turned to leave and placed the shock remote on her sister’s bedside table. In the end, she’d never actually used it. “Maybe I really was too lenient,” she thought to herself, frowning. “I’ll have to work on that in future…”

Jake heard the door close from between Rachel’s fat cheeks and gulped nervously. He was alone now, he knew, with his biggest, most dominant, and least hygienic sister. He tried to take a deep breath to calm himself and gagged instead; her ass smelled like it hadn’t been washed in weeks. Knowing her, it probably hadn’t.

Before long he could hear snoring, and Rachel’s butt began to rise and fall slowly around his face as she enjoyed her lie in. “Looks like I’ll be here a while,” Jake thought sadly, then closed his eyes as well. He wondered if he might be able to get some rest before what would surely be a brutally stinky day.

Paaaaaaaaaaaarrrrrrff

…somehow it didn’t seem likely.

*

A few hours later the two were still lying in bed. Rachel hadn’t moved, unless you counted occasionally rolling over to get into a more comfortable position; right now she was back on her stomach, which at least meant Jake could use her ass as a pillow instead of being crushed by it. Not that it helped him get any sleep.

Sppplllllllrrrrrrt

He winced as he sucked up the rank, oniony blast. Thanks to her poor diet Rachel’s gas was greasy, bitter and somewhat spicy, making it just that little bit more torturous to inhale. He didn’t know if she knew about the kiss rule, or would even feel it in her sleep, but he made sure to give her buttocks passionate smooches anyway. The risk just wasn’t worth it.

“Mnuhh,” Rachel grunted in her sleep. She shifted her weight again to fart, and this time lifted her leg clear away from Jake’s neck. For a moment his eyes lit up – he was free! – but only until he remembered his situation. He still had to stay within range of the remote. Sure, he could leave her ass, but he couldn’t go anywhere… and if she woke up and found him not in her butt, he was sure she’d make him regret it.

“Might as well stay put.” He reflected miserably. “At least I can turn my head now.” And in doing so, he saw it. For a moment he lay stunned, frozen in shock; until a bassy fart vibrating in his ear brought him back to his senses.

His remote was just… sitting there, on the table by the bed!

“Holy shit…” Jake swallowed. That tiny little remote controlled his entire life! “I could just take it and leave!” He felt his heart start to pound, and his breathing quickened. That made him cough; he covered his mouth, glanced at Rachel, saw her still unmoving.

“Shit… gotta stay calm.” He breathed. If he panicked it was all over. “I can do this.” He began to reach out slowly, keeping his body as still and silent as possible. It was so close… his freedom was so close!..

“Try it and I’m seriously gonna take a dump on your head.”

Jake felt his blood run cold. He literally dived back between his sister’s buttocks and started kissing every bit of ass his lips could reach, while his sister chuckled and slowly began to sit up. He couldn’t believe it. For the second time this week, he’d fallen for her “faking sleep” technique!

“Unbelievable, Jakey. I uncross my legs for what, 2 seconds? And you’re already trying to escape? I thought you’d be trained by now! What the fuck have you been doing all week?”

“I’m sorry mistress, I’m sorry!” He begged for forgiveness, not even taking his lips off her cheek.

“Yeah, you’re sorry you got caught.” Rachel stretched lazily, turning over and flipping her brother with her. Then she sat down, putting her full weight on his head. “Luckily I’m in a forgiving mood, so I won’t hold it against you. Buuut, you do still need to be punished. Actions have consequences, Jakey~!”

“Mistress…” She cupped her feet underneath his head, pressing him further up into her crack, and he sensed her leaning to reach for something. He already knew what. “Mistress, please!”

Bbbbzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzztttttttttttt!

Fffffppppppprrrrrrrrrrrrraaaaaaaaaaafffffffffffffffffffffffppppp

Jake received two things simultaneously: an excruciating electric shock from his collar, and a powerful flapping fart right up the nose. It was a devastating combination, as the agony caused him to reflexively inhale extra-sharply, making the putrid gas seem to stink even more than usual. His pain was Rachel’s pleasure, however, as she enjoyed the feeling of his thrashing deep up her ass.

“Ooh shit, that feels good. You’re like a human vibrator!” She laughed. “I kinda hope you misbehave more often. Or actually, fuck it, I’m in charge here, I can just do this whenever I want!”

She gave him a few more quick shocks, more for pleasure than punishment, but soon found it in her heart to forgive him. It was far too early to relax, however. Rachel had only just woken up. Now she was about to put him to work.

She climbed off the bed and switched on her computer, while her still recovering brother climbed down onto the floor. He landed on his hands and knees and felt his palm touch something sticky – a pair of Rachel’s used panties, heavily stained. He fought the sudden urge to vomit.

“Hey pervert! Stop feeling up my panties and get over here.”

When Jake looked up his sister was waving to him from to her desk. She made him crawl over and kneel behind her computer chair, which was an old-fashioned model with an empty space between the seat and the backrest. Then she yanked him as far forward as he could go, zip-tied his wrists to the arm rests and had him rest his chin on the edge of the seat, his face positioned directly behind where her she would be sitting. He could see where this was going.

“You ought to have a pretty good view from there, huh?” Rachel grinned. She gave him a quick pat on the head, then turned and sat down heavily, before starting to shimmy backward. With every little shuffle Jake’s nose poked further and further into her crack. He groaned and squirmed, but there was nowhere to go – soon he was back in his least favourite (but increasingly familiar) position, with his face wedged up his sister’s butt.

“Great! Now don’t distract me, OK? Just sit back and… ugh…”

Ffppppppppppoooooooooooooooooooff

“…enjoy the atmosphere.”

Obeying that last part was not physically possible, but Jake certainly did his best for the first. As Rachel began her daily marathon gaming session he forced himself to remain still (or as still as one could while breathing in such foul fumes). He listened quietly to her furious clicking, clacking and cursing, as well as the rustling of chips and the sound of sodas being cracked open. And then, of course, there was that sound.

Ffoooff

It seemed like the junk food was already affecting his sister’s stomach. The amount of farts she ripped was quickly increasing, and they were getting smellier, too. He could actually taste the potato in that one, not to mention the greasy, oily cheese flavouring.

Brrrrrrrrrrrraaaaaaap

Bffffffoooooooorrrrrrt

Sudden twin farts in rapid succession caught him off guard – he’d been halfway through sniffing the first, nostrils flared, when the second squeaked out unexpectedly. Jake jerked backward with enough force to move the entire chair, which of course did nothing to help him, but did manage to piss off his sister.

“Uggggh, Jake! I told you not to distract me!” She leaned forward, concentrating, only to sink back down a moment later in frustration. “Great! Just great. That was a ranked game, Jakey! God, you’re supposed to be helping me!”

“I’m sorry, Mistress Rachel!” Jake offered his apologies the most humiliating way he knew how, by immediately plastering his lips to her crack. It was unsettling how quickly he found himself doing that recently.

“…Whatever. We were a man down anyway.” Rachel threw back her head to chug the last of her soda, then belched angrily and tossed the finished can at the other side of the room, missing her trashcan by several feet. “Hmm… I could do with some real food. I bet you’re hungry too, huh?”

“M-me? Well… ah…” Jake was hungry, but ever since his family had enslaved him mealtimes had rapidly become some of the most disgusting parts of his day, and he knew this was unlikely to be an exception. Rachel wasn’t waiting for his opinion, however.

“I’ll get you something too.” She decided, standing. “Aren’t I a good big sis? Maybe once you’ve eaten you’ll do a better job sniffing, haha!”

Before she left she stuck a hand down the back of her panties and rubbed it thoroughly up and down her crack, then smeared her filthy palm into Jake’s face. She called it “marking her property”. By the time she’d finished he probably stank enough to attract flies from miles around, but he did at least get to enjoy a few minutes of peace afterward.

“God, I hope she isn’t planning anything weird today.” While still easily in the top five worst days of Jake’s life, at least so far he hadn’t been physically exhausted, or subjected to bizarre experiments. If greasy face-farts were the worst thing he experienced today he’d count himself lucky. “…What the fuck is my life turning into, where that’s what I consider lucky?” He sighed miserably as he continued to wait for his sister, looking up at the remote that she’d surely left on her desk deliberately, tantalisingly close but still completely beyond his reach.

“I’m back, bitch!” Rachel announced when she eventually returned, bringing with her two tasty-looking sandwiches. “Were you a good boy, huh? Did you miss my raunchy ass? Don’t worry, we’ll get you back where you belong soon. But first let’s have some food!”

She untied him from the chair and had him kneel beside her bed, then came and sat down beside his head. She set her own plate aside and waved his in front of his nose.

“Grilled cheese.” She said. “Mmmm, smells good, right~?”

It... did. More than good, actually. It smelled incredible. He inhaled deeply, and got not a single hint of farts or sweat… this was a delicious, completely untainted sandwich. But would it stay that way?

“Now, open wide!” Embarrassingly, Rachel insisted on feeding him herself. She ripped a corner off the toasty (he could only pray she’d washed her hands) and dropped it in his mouth.

When it made contact with his tongue, he almost cried. It was… amazing! Sure, it was just a simple grilled cheese, but after three days of eating gas and butt-debris, this was the best thing he’d ever tasted. He chewed it gratefully, savouring every bite, his mouth already watering for more.

“Wait! Don’t swallow.” Rachel stopped him just before he could complete the mouthful. He looked up nervously, and saw the most terrifying grin on her face. “Aww, haha! You looked so happy, I almost feel bad! You’re really not gonna like this next part.”

She pushed his head back onto the bed, so he was looking straight up, then stood over him. She looked over her shoulder at him and winked as she grabbed her panties, and slowly pulled them down. “Keep your mouth open,” she warned him as she sat.

“Oh God… What is she doing?” Suddenly finding himself deep in his sister’s naked ass-crack, Jake’s heart began to pound. He could feel her shifting around on top of him, carefully positioning herself… until at last she stopped, with her dirty, puckering anus aligned directly over his mouth. His still wide-open mouth. His eyes widened. “No… please!”

Ssppppppprrrrrrraaaaaaaaaaaffffffffffffffffffffff

A searing jet of bitter shit-air rushed to fill Jake’s oral cavity, coating every square inch of his gaping maw with the taste of rotten onions. The gas was so thick he could almost chew it. His stomach roiled and his body prepared an almighty heave; but before he could make the slightest cough, his sister jumped up and slammed a hand over his jaw.

“Haha, oh my God! That one burned coming out! It’s gotta be ripe!” She laughed hysterically, keeping her hand firm while her brother writhed. “Okay, okay! Now you can swallow. Do it.”

Lacking any other real choice, Jake did. He gulped down the tiny bite of grilled cheese (which he couldn’t taste even slightly any more), along with an entire mouthful of methane. He moaned, the feeling of all that air travelling down his throat making him nauseous. This was probably the closest possible thing to eating a fart in solid form.

“Mmm-mmm. So gooood, huh? Aren’t you a lucky boy?” With her free hand Rachel was taking bites of her own sandwich, and looked like she was enjoying it a lot more than he was, but her focus was still on her little brother’s suffering. She waited until she’d seen him take three big swallows before finally releasing him, only to immediately get into firing position; she squatted directly over his head, her cheeks just gently brushing his jaw, then ripped off another chunk of his meal and dangled it above. “C’mon, open up… here’s your next bite~!”

Jake’s tongue was still soaked with the rancid taste of his sister’s last ass-blast, and he was hesitant to obey. Luckily, Rachel seemed find his reluctance amusing rather than annoying.

“Aww, not hungry any more? But you’ve gotta eat, Jakey!” She giggled, playfully poking at his face. Eventually she sighed, and reached down to pinch his nostrils shut. Jake’s eyes widened – the only way he’d be able to breathe was if he…

“Haha, something tells me you’ll be changing your mind pretty soon!” She smiled evilly. “And don’t worry! As soon as you’re ready to eat, I’ve got your seasoning…” She rubbed her pudgy belly. “…ready to go!”

“I’m just delaying the inevitable,” Jake realised, despairing. She had him trapped; sooner or later, her farts were going down his throat. And he was so hungry…

He closed his eyes, and opened wide.

*

Practically Jake’s entire day was spent in just two locations: he was either in his sister’s bed, or kneeling behind her chair. And no matter which, his nose was always up her crack.

Brrrrrroooooooooooopppp

Right now was no exception. Rachel was back at her computer, and he was back on his knees, nuzzling closer into her panties to huff her latest blast – ugh, beefy – and give her cheeks a kiss. She didn’t react. While she was gaming she never acknowledged him, as long as he didn’t distract her. So he kept all his thoughts to himself.

“She’s gotta be nearly done, right?” He knew it was late. The skies outside had long turned dark, and dinner (farts, with a side of lasagne) had been hours ago. But Rachel was still grinding away, fuelled by a buffet of energy drinks and junk food that were clearly doing a number on her guts. Would she be up until 2, 3? Later?

“Oh God, please let her be done soon!..” Jake had had a long, tiring day, and naturally was looking forward to sleep; but that wasn’t the only reason he was desperate for Rachel to call it a night. Unlike with his Mom and sisters, whose gas had been similarly unpleasant all day, Rachel’s had been getting steadily worse ever since lunch. Her farts were growing longer, louder… wetter. And in the past hour he’d noticed her shifting in her seat, just a little. Jake could see what was happening, and the thought terrified him.

“We just need to make it another hour or two!” He silently prayed. “Please Rachel, just go to bed! Hold it in until tomorrow! We’re so close! I don’t want to – ”

Sspppppaaaaaaaaaarrrrrrrrrapptpptptptpt

With one appalling, bubbly fart, Rachel dashed her brother’s hopes. He watched in horror as a large wet patch suddenly appeared on the back of her panties, damp on the tip of his nose; and an ungodly stench began to fill the room, with his face right at the shitty epicentre. He immediately began to dry-heave.

“Oh shit.” Rachel grimaced, holding her stomach. “Yikes… I was gonna hold off on this, but… oh well. Nature calls!” She shrugged. “Sorry, Jakey! I gotta take a mean dump, and you’re gonna get a front row seat!”

It took three separate shocks before Jake was docile enough to willingly follow his sister into the bathroom. He crawled submissively behind her, watching her fat cheeks bounce along happily and dreading what was about to come out of them. Once they were inside, Rachel locked the door behind them and dropped her panties around her ankles.

She looked down at him, grinning, and for one terrible moment Jake wasn’t sure what would happen next. But his worst fears, at least, were not realised. She sat down on the toilet, legs spread, and patted her thighs invitingly.

“Haha, was someone scared he was about to be eating dessert?” She laughed. “I guess I can’t blame you! But don’t worry, I wouldn’t go that far… not this week, anyway. We all agreed beforehand not to push you too far during your initiation. Once you choose me, though, Jakey, who knows?” She winced suddenly, grabbing her stomach. "Oof. Anyway, quick, get your head in closer.”

He was already kneeling right in front of the bowl, but she pulled him in further, so his chin rested on the edge of the seat. He was nestled right between her thick thighs, and his face was uncomfortably close to her shaved crotch – but that wasn’t what concerned him most. That would have to be the view he saw below, of the crisp, clear toilet water that would not be crisp or clear much longer.

Fffffffaaaaaaaaaarrrrrrrrrfffffffffffff

An airy sounding fart disturbed the pool, ripples spreading across its surface. Jake’s body stiffened, paralysed by the smell, like a deer in headlights. This was her worst yet, the last bit of gas that preceded the monster lurking right behind. And a few seconds later…

“Hnng.”

What followed was the most repulsive, abhorrent event Jake had witnessed in his entire life. Before his eyes, Rachel unleashed an unholy mess of brown destruction in all manner of shapes and sizes; some were light sharts that spattered the sides of the bowl, others chunky, heavy masses that crashed heavily to the bottom. One was so big it actually splashed the lower part of his face in filthy water, sending him immediately into a wild, panicked frenzy.

“Hey, quit it! Do not pull away.” Rachel kept him in place with a firm grip on his hair. She stroked it gently when she wasn’t holding him still. “I want to hear you appreciating this, Jakey. Let’s hear a nice big sniff!”

“N-no…” He couldn’t. The smell was nightmarish even without him actively inhaling it – just wafting up by itself, it was 10 times stronger than any fart he had smelled. It stung his eyes, poisoned his lungs. If he actually tried to sniff those toxic fumes, there was zero chance of him keeping his lunch down, or dinner.

In a rare display of mercy, Rachel didn’t force the issue. Of course, she also didn’t let him back away. Jake spent the next fifteen minutes watching his sister paint the toilet brown, trying his hardest just to breathe in the smog of her hazardous waste, and wondering how much bigger the mountainous pile below could possibly grow.

Until finally, she was done. With a satisfied sigh she stood up, letting Jake slink weakly away while she turned around to inspect her work.

“God damn!” She said, impressed. “I think I just lost 5 pounds. This almost seems a shame to flush, haha! Wanna pose for a photo with it?”

He looked up wearily, not entirely sure if she was joking, but his sister was already turning away. She looked directly at the full roll of toilet paper, then back to him, making sure he was watching. She grinned and winked. Then she pulled up her panties.

“Ugh…” Jake couldn’t hold back a revolted groan.

“Don’t “ugh” me. I’m leaving a special extra-smelly scent for you to enjoy, you should be grateful! Plus, this’ll give you something to work on in bed.”

That last part sent a jolt of fear down his spine. “W-what do you mean, Mistress Rachel?”

She smiled. “I’m pretty tired now. Think it’s time we hit the hay.” She flushed the toilet. “And I’m a very kind owner, so I’m not even gonna belt you to my butt all night. …Although, you did already try to escape today, so I’ll still have to cuff your ankle to the frame or something. But apart from that you can sleep wherever you want!” She flushed a second time. It still didn’t completely remove the waste. “There’s just one rule.”

He was too afraid to even ask. But Rachel had the answer for him anyway. She bent over, showing off her humongous ass, and gave it a hearty slap.

“When I wake up tomorrow morning,” she said, “my crack had better be squeaky fucking clean.”

Jake’s mouth gaped open in horror. He knew exactly what she was implying, what she expected him to do. She wanted him to clean her filthy, unwiped ass, using only his – his tong – he couldn’t even finish the thought. Just thinking about it made him feel ill.

“Please, mistress!” Begging was his only option. “Please, please – !”

“– Please, let me lick your butt all night? Well sure Jakey, whatever you say!” She laughed. “I don’t wanna hear any whining. You’ll have ages, you can take all the time you need – although it probably won’t get any easier when it’s dry – just so long as you get it done. If I wake up tomorrow and find you’ve disobeyed a direct order… there will be consequences.”

Jake began to despair, realising his sister was deadly serious. He genuinely didn’t know what he was going to do. He wasn’t even sure this was an order he could physically bring himself to obey; but at the same time, he was petrified of what unknown punishment he might have to endure if he didn’t!

“Okay then, let’s go to bed.” Rachel yawned. “I don’t know about you, but I’m pooped!”

For now, at least, Jake wouldn’t make a decision. He just submissively followed his default instructions, the commands he knew best, pressing his face into Rachel’s now extra-rancid crack and giving it a kiss. “Another day almost over,” he thought miserably. How was it they always seemed to get worse?

He could only dread what fresh nightmares tomorrow would surely bring.

Friday

The sound of birds chirping in the morning was not ordinarily one that inspired fear. But this was not an ordinary situation. When Jake heard their happy tweets float in from outside the window, it was almost enough to send him into a blind panic.

“Shit… shit! I’m running out of time!”

He was lying beneath the covers of his older sister’s bed, watching her massive ass gently rise and fall just inches from his face. The stench of Rachel’s crack, even without her constant farting, was atrocious – but Jake had positioned himself here deliberately, despite the stink. In fact, it was because of the stink that he had to be here. His mistress had instructed him to clean her filthy, waste-covered rear using only his tongue, and had given him all night to do it.

But now his time was almost up.

He stared into the reeking brown abyss before him, almost crying at how little progress he’d made. He had tried, really tried! The threat of punishment Rachel had promised for failure was a powerful motivator. But every time his tongue made contact with a patch of her toxic sludge, his body rejected it automatically, and it was all he could do not to vomit. Not only that, but with his head so close to her bare asshole, every fart was making him light-headed and woozy; he had already passed out more than once. Thanks to these difficulties he estimated he was only about a quarter of the way done with the job. Maybe a third, if he was being generous.

“I have to keep going.” If he didn’t finish now, not only would he have to face the repercussions… but everything he’d done already would go to waste. Everything he’d already eaten. “I can’t – I can’t have done all this for nothing!”

Taking a shaky breath, he began to lower himself back down. He stuck out his tongue, aimed at a particularly messy spot right in the centre of Rachel’s crack, and closed his eyes. Maybe not actually seeing it would help.

Fffooooooooooopppppppsh

Unfortunately with his eyes shut Jake had also failed to see his sister’s puckering anus, which had pulsated angrily before firing a short, sour blast directly down his throat. He recoiled backwards, retching, and let his weary body collapse into the mattress. “This is impossible…” He thought miserably.

Suddenly there was movement above the covers. Was Rachel awake already, preparing to check on his progress? His heard began to pound with terror – but when a hand pulled back the duvet, it wasn’t his sister’s face he found himself staring up at.

“Good morning, sweetie!” His Mom whispered. She wrinkled her nose as the trapped stink from under the covers wafted up. “Whew. Smells like someone had a busy night!”

“M-mom?! I – ”

“Shhh!” She put a finger over her lips, smiling. “Let’s not wake your sister, you know how she likes her lie-ins. But for you, mister, it’s time to get up! It’s Friday, and you’ve got another long day of worshipping Mommy’s butt ahead of you!"

“Worshipping…” He processed the information slowly. Thinking about it, he vaguely recalled Ashley complaining about their Mom getting two days to use him, while his sisters got one each. So she was here to claim him for her second day? “But if I leave now…” He looked back down at Rachel’s still incredibly unclean ass. “…Could I have just a few more minutes?”

“Aww, you want to spend more time with your sister? That’s so cute! But slaves don’t get to make requests, silly.” She picked up the collar remote from the bedside table and waved it at him. “Now come on, rise and shine! I’ve got a nasty morning-gas bubble brewing inside me, and I’d hate to have to punish you for missing it.”

She was already walking away. Jake looked between his two family members in a panic, but in the end he had no choice; he forced himself to give Rachel’s crack one last horrifying lick from top to bottom, swallowed, choked back vomit, and finally jumped off the bed and hurried after his mother. “I hope I did enough,” he worried. Now he could only pray that his sister would show mercy for his efforts.

For now, though, he had more pressing concerns. He crawled forward as fast as possible, preparing to throw himself into his own Mom’s ass and sniff the fart she was saving for him. He’d hate to keep her waiting, after all.

*

“And now, from the Mountain position, let us move into the Warrior.”

Jake’s Mom exhaled softly as she brought her right foot forward and bent her knee into a lunge. She brought her arms together as though praying, closed her eyes, took another deep breath. Her entire body was in a state of blissful relaxation.

Bbffffffffffffrroooooooooooooooooorrrrrrppp

“Mmnn…”

“Quiet, sweetie.”

Jake struggled to obey as he sucked up the cloud of noxious, eggy methane from his Mom’s spandex covered ass. The pair were practicing yoga in his room – or, more accurately, what used to be his room. In the past few days all of his things had been cleared away, while a yoga mat and wide screen television had been moved in. Apparently she was turning it into a multi-purpose room.

“That’s great.” A soothing voice came from the instructional video on the TV. “Now, hold that pose. Relax. Feel all the tension in your life just flowing out your body.”

His Mom sighed contentedly. Unfortunately, tension wasn’t the only thing flowing from her body.

Pprrrrrrrrrrrrrrrrrrrfffffffffffffffff

Jake almost moaned again, but managed to supress the noise by mashing his face further between his Mom’s jiggling buttocks. As she was wearing a one-piece, skin-tight purple leotard, one that hid very little of her voluptuous frame, he ended up quiet deep.

She smiled as she felt his nose tickling her backside. “You know, you should try this too, honey. Yoga is a great way to reduce stress! Focus on your breathing: in through the nose, out through the mouth. In, out. In, out. Nice and slow. That’s it.”

He inhaled as instructed while his mother shifted into her next pose, the downward dog. She bent over to support herself on her hands and feet, arching her back up high. As her ass lifted into the air the position allowed her cheeks to separate slightly, and Jake found himself sinking even further into her crack.

Prrrvv

Unluckily, his new breathing technique greatly enhanced the aroma of his Mom’s latest fart. He could really taste the rotting meat, the pungent dairy; absolutely foul. But he made sure to kiss her ass in gratitude anyway. When he brushed his lips against her crack, the leotard was so tight he could almost feel her anus through the spandex.

“Aaaaaand relax.” The voice on the TV soothed. “Great job! Time for a break.”

Jake’s Mom sighed with relief as she broke the pose, descending to the floor to sit cross-legged – and using her son’s head as an unfortunate cushion. She fanned herself, overheated; her face was flushed and she was sweating copiously. Her armpits were especially drenched. She picked up a rag to rub them with, soaking up a virtual ocean of perspiration.

“Phew! Yoga may be good for you, but it’s pretty tiring, too,” she panted. After her armpits, her breasts were next. She pulled open the front of her leotard to swab at her sweat-covered chest, and took several gulps of water from a sports bottle. “Oh, sorry, honey. You’ve been working hard as well, haven’t you? Do you want a drink?”

“Yes, please…” Said Jake, once his Mom leaned to the side so he could speak. When he heard her giggle he knew he’d made a mistake. Instead of the bottle, she held her sopping rag over his face and began to wring it out; hot, salty sweat poured down, dribbling over his face and into his mouth. It tasted disgusting, but he forced himself to swallow it all, and muttered a quiet “thank you” once she’d finished.

He expected his Mom to sit back on his face afterward, but she surprised him, plopping herself down heavily on his groin. She swivelled to face him and stretched out her legs, playfully pinching at his nose with her bare toes. They were sweaty, too. And cheesy.

“So, I thought I should have a check-up chat with my special little fart vacuum.” She smiled warmly. “How’s your week been going so far? Have you settled in to your new life okay?”

Jake looked at his mother, uncertain. Should he answer honestly? Should he use this chance to beg her to set him free? Or was this some kind of test? “It’s been… different…” He answered cautiously.

“I’m sure!” She chuckled, stroking his cheek with her sole. “But I can already see how much progress you’ve made. And in such a short amount of time! I’m so proud of you, sweetie!”

Jake didn’t respond. He wanted his life back, not praise for his fart-sucking ability, but all the same he couldn’t help finding his Mom’s words weirdly encouraging. “…no! What am I thinking?!” He shook his head.

“Now, what about your sisters? Do you know who you’re going to choose yet?”

“…No. Um… No idea.” Jake frowned. Actually, he realised, he hadn’t given it much thought at all. He’d been so focused on just surviving the present that he hadn’t had time to worry about the rest of his life. But even now that he was thinking about it… he couldn’t pick a clear standout.

Ashley’s butt was the comfiest, but also the sweatiest. Natalie was the nicest to him, but her experiments were harsh and unforgiving. Rachel’s tasks were the simplest, but often the most disgusting.

On average, Ashley’s farts smelled the worst, Natalie’s were the most frequent, and Rachel’s were the… ugh… messiest.

Ashley was bratty. Natalie was crafty. Rachel was crude. Each had their pros, as well as some truly horrifying cons.

“Oh God, who am I going to pick?” Obviously his life was going to be hell no matter who he chose, but surely there was a least unpleasant option. Who would be the easiest to live with? Who did he want to worship for the rest of his life? He genuinely had no clue.

“I’m glad none of them are going easy on you, at least!” His Mom laughed, seeing his distress. “There was some concern when we were planning all this that your sisters might “pull their punches” a little. You know, give you a nice, easy day with no shocks and barely any farts, purely so you’d want to choose them. But that’s a little deceptive, huh? Plus, if everyone did that, you’d have no idea what serving them would actually be like! So we agreed beforehand that everyone would give you as realistic a day as possible. Sounds like they’re all keeping their promise!”

He nodded grimly. “Definitely.” They had to be, surely. The past three days had been actual torture, each sister having pushed his poor nose to its breaking point, and well beyond. There was no way any of them could actually have been holding back! “…right?”

“Well honey, you still have plenty of time before the big day, but you really should start thinking about this seriously. This is the most important decision of your life, after all! You need to be absolutely certain you choose correctly!” She rose to stand over him, placing her hands on her hips. “For now, though, I think it’s time we resumed your training. I hear someone has a problem handling bare-ass farts?..”

Jake cringed; he knew exactly what she was talking about. The first night with his Mom, in Natalie’s Fart Box, and even just a few hours ago in bed with Rachel – every time he was forced to inhale farts direct from the source, without any clothing to filter the stench, the raw power of his family’s gas made him feel woozy and eventually knocked him out. That wasn’t a problem he especially wanted to solve, however.

Of course, he hardly had a say in the matter. His Mom winked at him, turned around, and reached back for her ass. She dug her hand in her crack and fished around until she found the thin line of spandex covering her crotch and ass, which she pulled out and held to the side.

“In you go, sweetie! Press your nose right up against Mommy’s asshole, okay?”

Jake almost sobbed. He wanted so desperately to refuse, to run away and hide… but he knew he’d only be shocked until he obeyed anyway. So to save himself some pain he instead sat up, shuffled forward on his knees, and willingly shoved his face up his mother’s backside.

“Mmm. That’s good.” His Mom took a moment just to enjoy the feeling of her own son devoting himself to her bottom; then she patted him affectionately on the back of the head, and let the leotard snap back into place. “There we are! Now get comfortable, Jake, because you’re going to spend quite some time in there today. We haven’t even finished our yoga session yet!”

Resuming the video, she widened her legs and held out her arms, returning to the default pose. At the virtual instructor’s signal she lowered her body into a squat, squashing her son’s body and allowing a burst of gas to flow freely from her anus. As she sighed she heard a weak mumble from her son down below; likely some complaint about his current position, or a plea to leave.

“Oh shush, sweetie, don’t be silly.” She muttered, more to herself than him. “You’re already right where you belong!”

Burrrf

“Ah. Home sweet home.”

*

Earlier, Jake had noted that each of his sister’s asses were the “worst” in their own way. Ashley’s was the sweatiest, Natalie’s the gassiest, and Rachel’s the least clean. But now he realised his Mom’s ass was the clear winner in all three categories… and he’d had his nose buried in it for almost 12 hours.

“This is hell,” he despaired, blindly hugging his mother’s hips as she walked somewhere, her mammoth buttocks grinding on his head. He’d been forced to sniff his Mom’s butt before, both clothed and bare, but compared to Monday it was far worse – rivers of sweat ran down her cheeks, farts oozed from her anus in an almost non-stop stream, and it seemed she hadn’t wiped after her most recent bowel movement. It was as though she’d deliberately made her ass as disgusting as possible in preparation for today. And through it all, he was still undergoing his “training”.

Grrrgggl

At the sound of a low gurgle Jake snapped to attention. He angled his neck back and brought his face forward, pressing his nose flush against his Mom’s butthole – a perfect seal. And just in time.

Ffffffffffffffffpaaaaaarp

With an expertly timed inhale he sucked the entire rank emission into his lungs, trying his best to ignore the nauseatingly cheesy aroma, and the droplets of ass-juice that splashed him. He held the position for some time, eventually peeling his nostrils off the sticky orifice and giving it a kiss.

That was his Mom’s training method; for each fart, he was to keep his nose firmly attached to her butthole until every last particle of gas was inhaled. If he pulled back in disgust, began slipping into unconsciousness, or otherwise failed to hold his nose to her anus, he could expect repeated electric shocks until he was back where he “belonged”.

And sadly, it seemed to be working. While the unfiltered stench was still enough to make him light-headed, Jake was now able – forced, really – to stay awake through even the most powerful and putrid blasts, and he hadn’t received a shock in over an hour. In just a day, he’d become an expert at sniffing bare-ass farts. Blacking out would no longer be a means to escape his family’s gas.

If they didn’t stop soon, though, Jake felt like he might pass out anyway, from sheer exhaustion. There was no way to tell time down here, but he must have been serving his Mom for over 12 hours now, and he was approaching his physical limit. “Should I try to signal her?” He wondered. Vocal complaints usually just got him punished, but maybe… maybe if he kissed and licked especially vigorously, or something…

Suddenly his mother stopped walking. “Shit, is she about to sit down?” Being chewed between his Mom’s buttocks as she moved was far from pleasant, but he preferred it to the incredible weight pressing down on him when she sat. To his overwhelming relief, however, she did neither. She’d stopped to pull the back of her leotard out of her crack. He felt her hand pat the back of his head, and with a gentle tug, she released him from her stinking cave. He was free!

Jake fell back, gasping and wheezing. He took in his surroundings slowly, his eyes not used to the light. They were out in the hall; his Mom had let him out at the foot of the stairs. “Thank God.” Stairs were especially brutal while being butt-smothered.

“There’s my little trooper!” His Mom smiled down at him, hands on her hips. “How are you holding up, honey?”

Jake coughed. In truth, he still felt miserable; all those hours spent huffing his Mom’s fumes had taken their toll on his body. But he was so glad to be out, to be breathing fresh, clean air again, that he just looked up at his mother and held out a shaky thumbs up.

“Aww, that’s great! I know it must have been a tough little session for you. But you made it through, and you’ve become an even better slave for your sisters!” She held his hand, squeezing it encouragingly. “I really am proud of you, sweetie!”

He smiled, despite himself. “S-so… have I earned a break?” He asked hopefully.

“Hm? Well, in a way. It’s time you were off to bed. It’s another busy day tomorrow!”

“…Right…” He sighed. “No point delaying the inevitable, then.” He took a deep breath and crawled back around to his mother’s arse, then began to wedge his head back inside.

“Ooh! Very good, Jake, I love the initiative – but that’s the wrong way!”

“Yeah, bro! God, I hadn’t realised you were such a mommy’s boy!”

“H-huh?” Jake pulled backward and looked to the sound of a familiar voice – his youngest sister, Ashley, had appeared behind them! She was already dressed for bed, wearing a pair of tight fitting cotton shorts and an oversized shirt.

“You’ll be spending the night with Ashley, sweetie,” his Mom explained.

“B-but I thought – ”

“Hey, don’t assume, bro! Unless it’s about “ass”, “u” and “me”!” She laughed at her own dumb joke. “Sorry Mom, I’m pretty tired. Mind if I take him straight up to bed?”

“Of course not baby, he’s all yours! Good work today, Jake, and good night, both of you! I’ll see you tomorrow, okay?”

“Okay, night Mom!”

And with that his sister was off, already halfway up the stairs before Jake realised he needed to scramble after her. “So… I’m with Ashley tonight?..” He was still trying to figure out what was happening, which was difficult given how much time he spent buried in ass-flesh, literally in the dark about his surroundings. He hated these constant surprises. Why did his family give him so little information?

“Ashl – Mistress Ashley?” He asked warily. Was asking questions allowed?

“Hm?” She didn’t look back, still heading up the stairs.

“I was just wondering – who will I be serving tomorrow? And Sunday?”

“Oh! Well, everyone’s had you for a day now, and Mom got two, so for the next two days we’re just gonna share you between everyone. You’ll be pretty busy! Four mistresses, four assholes and only one nose to suck up all our gas, haha! Don’t stress though, it’s only ‘til Monday, and then you’ll only have to worry about my butt for the rest of your life.”

“Serving everyone…” He shuddered. It was like fate was punishing him for thinking things couldn’t possibly keep getting worse. “But – but then, at night – ?”

“Look, don’t worry about it, okay? A slave’s job isn’t to ask questions, it’s to obey.” Ashley cut him off as she led him into her room, closing the door behind them. “And right now you belong to me, so just shut up and check out what I’ve got ready for tonight!”

She was pointing smugly at her bed. Jake looked over wearily, and saw… a sleeping bag, rolled up on top of the covers? But why?..

“I know how much you love my sweaty booty, bro, so I figured I should crank up the heat even further! Look, see, we’ll get you all bundled inside the bag first, then you’ll be joined by my ass… then once you’re belted tight to my butt, I’ll zip us both up, and the whole thing can go under my extra-heavy duvet! Oh, and I also turned up the thermostat.”

Jake began to feel a growing sense of dread. Already, he was feeling uncomfortably warm. But being trapped all night, in that furnace, with his sister’s gassy ass!.. “Mistress Ashley…” He swallowed dryly. “The sweat…”

“Yeah, it’s gonna be wet down there!” She laughed. “You’d better lick fast! At least you won’t be thirsty, right?”

“I – I can’t…”

“You will. Now come on, let’s get ready! I’ll unfold the sleeping bag, and you can stick your face in my crack ‘til I’m done.” She patted her stomach and squirmed slightly. “Hurry up. I’ve been holding my gas in for you since dinner.”

Jake slumped, defeated. He just did as he was told, sinking into Ashley’s soft, warm cheeks, and trying not to imagine what they’d soon be doing to his nose. He wanted to appreciate this moment, savour every second of the present in which he wasn’t being tortured.

Pfffffffft

After all, it wouldn’t last much longer.

Saturday

“So it’s a double cheeseburger, large fries, and a chocolate milkshake, huh? Ooh, that does sound good, honey. I might try that as well! How about you, Ashley?”

“Just a salad, thanks Mom!”

“Seriously, Ash? What's the point of getting salad from the drive through?”

“Hey, just because some of us care about what we put in our bodies – !”

“Alright you two, that’s enough! Natalie, could you check on your brother, see if he wants anything?”

“Sure, Mom.”

Jake gasped for breath as his sister leaned to the side, and for the first time in almost two hours, the oppressive weight of her ass lifted slowly off his face. He blinked, his eyes stinging in the sudden light, and stretched his aching body. Lying in this cramped position, with only his head on the passenger seat of the car, had done a number on his neck.

“What’s… happening?” He croaked. His throat was dry, scorched from having swallowed so many of Natalie’s silent-but-deadlies. “A-Are we there yet?”

“No sweetie, not yet!” He heard his Mom call from the driver’s seat to his left. “We’re about halfway there. Still a ways to go!”

Jake groaned miserably, laying his head back down on the seat. “Halfway there…” Having to endure this torture for so much longer was a truly dismal prospect. Although to be fair, he was hardly looking forward to arriving at their destination, either.

The entire family – Jake, his Mom and all three of his sisters – had set out on a mini road-trip today, off to the quiet little holiday home he would soon be living in with his new mistress. It was a fair distance to travel, but their Mom had insisted they all go out to see it. Apparently it was important he get a chance to inspect the place he’d be spending the rest of his life… even if that horrifying thought was the exact reason he didn’t want to visit.

“Jake?” Natalie reached down to poke the side of his face. “We’re about to grab some food. Do you want anything?”

“Food?” He licked his lips. “Y-yes… please. Can I… am I allowed to sit up properly?”

“Oooh, I don’t know about that, Jakey,” he heard Rachel call from directly behind. “Will your meal taste nearly as good without one of us sitting on your face?”

“Plus we have to think about your safety, bro!” Ashley chimed in. “If we get into an accident, you’ll need a nice soft airbag around your head to cushion the impact!”

“Mmm. Speaking of air.”

Pffffffffffffffffffffffffffffffffffffffrrt

With Natalie still leaning to the side it was a moment before the sulphuric wave of stink hit, but when it did Jake’s response was almost automatic. He leaned in close and sucked hard, his chest rising as his lungs filled with putrid eggy methane. It was even more important he do his job properly here. Disappointing one mistress was bad, but there were four in this enclosed space; if even one of them got a whiff of the gas he was supposed to be absorbing…

“You can sit up, but only while we’re eating, honey.” His Mom continued. “That way everyone can help flavour your food!” She said it as though it was the most normal thing in the world.

“…Thanks, Mom.” He sighed. Was getting a break from face-sitting worth it, if it meant tasting all four of his family member’s farts? Probably not. He regretted even asking, now.

“Okay then, sounds like a plan! We’ll have a quick break for lunch, then it’s straight on to see your new home. Oh, and we'll need to decide who’s swapping with Natalie for the front passenger seat the rest of the way.”

“Shotgun!”

“Shotg- fuck!”

“Language!”

The sounds of his family’s laughter and bickering began to fade as Natalie lowered herself back down on Jake’s face. Darkness returned, and that familiar soft, heavy pressure. “Lunch, another hour or so, then the house,” he thought to himself miserably. He wasn’t sure which he was least looking forward to. He didn’t really want to think about it.

Fffffffffffftttt

As another airy fart arrived to torment him, Jake flared his nostrils and inhaled deeply, letting the warm, bitter scent of his sister’s bowels overwhelm his senses. The stink left no room for troubling thoughts about the future; it was disgusting, but it certainly made a good distraction.

*

When the car left behind the smooth asphalt of the highways for rough, winding side-roads, Jake knew they had to be getting close. He still couldn’t see anything – Ashley’s ass prevented that – but the change in terrain was obvious. Each minor bump in the road set her ass bouncing excitedly against his face, and whenever they hit a big one – like now – !

He caught a split-second glimpse of the outside world as his sister’s rear rose into the air, before it came crashing back down with a devastating butt-drop. She smashed into him painfully, with so much force he felt like he was being flattened into the seat. Then a nasty sounding gurgle warned him she was about to add insult to injury.

Bllllllllllrrrrrrrrrrrrrrrrrraaaaat

“Mmm…” Jake groaned as he breathed in the rank veggie-scented fumes. Once he’d inhaled them all, he pursed his lips and reached up to kiss his sister’s soft, smelly cheeks, though with the car bouncing around so much the task was surprisingly difficult. He was still trying (and failing) to keep his lips plastered against them when the car came to a sudden, abrupt halt. “We’re here,” he realised.

Jake could hear the heavy thuds of doors slamming all around him, but Ashley remained seated for a moment longer, reluctant to give up her seat. Eventually, however, she released him from his pillowy prison, hopping gracefully out of the car and dragging her brother along with her.

“Here we are, bro!” She announced cheerfully. “Our soon-to-be home! What do you think?”

He looked up wearily.

For a place that filled him with such overwhelming dread, the house looked surprisingly welcoming. Picturesque, even. A two-storey luxury log cabin, spacious, well-maintained… there was even a hot tub out on the side patio deck. The building occupied a small hillside clearing in the middle of the woods, with massive redwood trees sheltering them on all sides, and no other cabins in sight. Jake would be left well alone with his new mistress here.

The inside of the house, he found, was equally charming; a sleek, modern design, with a cosy layout and warm lighting that seemed to invite you in to relax. The entire place screamed luxury, comfort, quiet repose. “And captivity.”

They found the rest of the family waiting in the living room, a large and comfortable space with a wide-screen TV above a wood-burning fireplace, and floor-to-ceiling windows that offered an impressive view of the forested landscape outside.

“Nice place, huh?” Natalie smiled when she saw them arrive. “I’m looking forward to living here.”

“Finally! Now can we start the tour already?” Rachel’s eyes narrowed in on her brother. “Hey, what are you doing walking around like a normal human being? Pick an ass and shove your face in it. I’ll be happy to provide you one.”

“Rachel honey, it might be hard for your brother to enjoy the tour if he can’t see any of it,” their mother explained gently. “Why don’t we compromise? Jake can crawl around behind us, and if anyone needs to use him, his face will be right there.”

She thought for a moment, then shrugged. “Sounds good to me. Get over here then, Jakey! I’ve been holding this in since lunch.”

Jake gulped and sank to his knees, obeying as slowly as he dared. Approaching Rachel he found himself particularly nervous. Obviously she was about to gas him, and he was hardly looking forward to that… but he had another reason to fear her today.

Two nights ago, she had given him a… task… to complete while she slept. A task so stomach-churning, so foul, that he’d been physically unable to finish the job. He’d given up less than halfway through – and ever since, he’d lived in terror of what the price of his failure would be.

“So far, though… so good?” She hadn’t punished him for it yet, not when she’d seen him this morning or since… and when he glanced up now, he saw nothing different about her expression. Just her usual smug grin, and a wink, as she turned around to present her massive jean-clad rear. Had she forgotten? Or even decided to forgive him? Could he really be that lucky?

Bbbrrrrrrrrrrruuuuuuuuuuummmmmmmmmmp

“Ugh…” He certainly didn’t feel lucky as Rachel wiped his head up and down her crack, soaking up every trace of the beefy, milky stench she’d created while fanning the air with her other hand.

“Oof, God!” She laughed. “Who let me order that milkshake? Poor Jakey’s gonna suffer now!”

“Well, he can suffer and crawl at the same time,” smiled their Mom. “Now come on, let me give you the tour!”

And so she did. The family walked (and crawled) from room to room, taking in all the various amenities and facilities the house had to offer; there was a games room, and a sauna, and a second lounge, less roomy but with an even larger TV than the first. The decking outside had the hot tub he’d seen earlier, as well as a barbeque grill that Rachel had been especially taken with. The kitchen was sprawling, well stocked with both frozen and non-perishable foods, and a fine selection of wines. And the master bedroom upstairs looked like it should be reserved for VIP guests at a five-star hotel.

Even Jake began to feel a little better, as their Mom showed them the stunning view from the bedroom balcony. “As far as prisons go, it could be worse,” he decided, just before Natalie grabbed him by the collar to deliver another sour toot.

“…and obviously you’ll have loads of privacy, but at the same time, it’s only about a thirty minute drive to the nearest city!” Their Mom was explaining. “And – ah, now let’s see what you think about this room!”

This room turned out to be one of the least impressive, in Jake’s opinion. It was large and almost entirely empty, with just a few empty storage boxes lining the back wall. But each of his sisters immediately saw its potential.

“Ooh, this could be my home gym!” Ashley gasped as they entered. “I’ll have my weights there, my exercise mat there… and my new treadmill can go right there by the window!”

“Hmm. Lots of space, that’s good…” Natalie gave a satisfactory nod. “I think I’ll make this my study. There’s some experiments I want to try that need a lot of room just for the equipment.”

“Oh yeah, I’ll have some equipment to put in here, too!” Rachel laughed. “I’ve got loads of ideas! Like I saw this one video where a guy was strapped to a table. That’ll be you, Jakey! And then this huge, fat-ass girl comes over, shoves a funnel in his mouth – ”

“And on that note,” their Mom interrupted, “let’s go see the final room on the tour. Jake, sweetie, pay attention! I think you’ll like this one!”

He already knew, well before they actually went inside, but the sight of it still made him shiver with fear. The bathroom. It looked as pleasant as anywhere else in the house, but Jake was too familiar with his sister’s sadistic hobbies to see it as anything other than a torture chamber.

And then… there was something strange about the toilet itself, an odd little attachment lying beneath the porcelain throne. As he looked more closely at it, he began to feel a cold dread creeping up his spine.

“W-what – what is – ” He pointed, praying he was wrong.

“Well spotted sweetie! That little feature is brand new, added just before the house was bequeathed to your sisters.” She patted him on the head as she moved forward to show everyone. “You see, this part of the floor opens up, and this section of plumbing can be rotated like so… that way, a certain someone will be able to lie directly underneath the toilet, slot his head neatly right below the bowl, and open wide for – well, I’m sure you can guess.”

Somebody was laughing behind him, and someone else was saying “Eww!”, but Jake could barely hear them. The walls were closing in around him, and there was a loud buzzing sound in his ears. He felt numb. This… was his future? Only a week ago, he’d been a free man… what had happened to his life?

“…no, no, nobody’s testing it out right now. Your brother will need to build up to this, slowly – over a few weeks, at least. Toilet duties can often be a bit much for a new slave.” His Mom seemed to notice his devastated expression; she led them away from the source of his despair, back out into the hall. “Anyway! That concludes our grand tour! So, what do you all think?”

“This place is great, Mom.” Natalie smiled.

“Yeah! We get all this, and a fat stack of cash to live off of?” Said Ashley. “I can’t wait to move in!”

“Well, you won’t be moving anywhere, because Jakey’s picking me.” Rachel folded her arms.

“Haha, sure he is, sis! Keep telling yourself that!” She turned to her brother. “Come on bro, just tell everyone you’re picking me now, and you can devote yourself entirely to this!” She slapped her ass, sending ripples across her thick cheeks.

“Your brother still has until Monday to decide,” their Mom interrupted, gently but firmly. “But now we have to decide, on what we’re doing next. The plan was to spend just a couple of hours here before heading home, but it really is a beautiful place… why don’t we all spend the night?”

“Here?” Rachel sounded surprised. “Are there enough beds?”

“There’s the master bedroom, the guest room, and a pull-out couch downstairs. Jake is obviously already sharing with someone, and two of us will still need to double up,” said Natalie. “But yeah, we could do it.”

“And there’s plenty of sheets and stuff, the laundry closet downstairs was packed!”

“Then it’s settled!” Their Mom decided. “Someone go see what movies are on, while I inspect the wine selection. Ooh, this is just like a mini-vacation!”

With that, the family set off again, moving toward the stairs. All except Natalie, who held back for a moment alone with her brother. She leaned close to mutter in his ear.

“Not for us, though, Jake.” She whispered. “For us, this isn’t a vacation. It’s just a preview. Because after Monday, this is where you and I are going to spend the rest of our lives.”

*

Flames crackled softly in the fireplace, and a cheesy rom-com played on the TV above. The family lay sprawled out across three different sofas before it, having just consumed a somewhat excessive Chinese takeaway, and four of the five of them could not have asked for a more relaxing or enjoyable evening.

For the other… well, Jake was cosy, if nothing else. In his current position there was no shortage of heat. But he would still prefer to be almost anywhere else in the world, than pinned to a couch by his own mother’s mammoth rear-end.

Booooooooooooooorrrrfffff

A long, whining fart filled Jake’s mouth with so much methane it began to leak out his nose. He alternated between sniffing and gagging, as the tiny pocket of air available to him was contaminated by hot, eggy ass-gas; he was just beginning to smell the effects of the takeaway now, which meant his sisters would be almost fuelled up again too. He’d probably be let out to service them soon. Would that be an improvement? “Or just out of the frying pan…”

By the time the credits rolled, food and warmth had left the sisters pleasantly tired. And gassy. They sat up, stretching and yawning, and there was a general agreement that it would soon be time for bed. There was just one little detail to sort out first.

“So!” Said Rachel. “Who’s getting fart-breath tonight?”

“Oh, about that,” Natalie replied. “I was going to suggest – ”

“We should draw straws again,” Ashley interrupted.

“Haha, should we now? If “we” means me and Nat, then sure.”

“No, me too!” She pouted. “Why am I disqualified?”

“You did win yesterday,” Natalie reminded her.

“So?! Straws are random, it’s fair!”

“Forget it, Ash.” Rachel shut her down. “You had your turn already. Go get the straws.”

“Ugh. Fine!” She huffed, standing, and would have stomped right out the room – had a brilliant idea not suddenly come to her. “Unless… you wanna make this more interesting.”

“…interesting?”

It was a good choice of words; Ashley had managed to pique both Natalie’s curiosity, and Rachel’s competitive streak. They were sat up now, and listening. “Here’s what we should do,” she grinned.

Back on the couch, Jake grunted with pain. By the time his Mom finally climbed off the sofa, her weight had squashed him so thoroughly that his head was left stuck to the ass-print she’d made in the leather. Everyone but him had a good laugh about that. He then watched wearily as his mother kissed each of her daughters goodnight, and blew him his, to avoid getting too close to his stink-stained face.

And then it was just him and his sisters. Jake was so tired he would happily have gone to sleep right there on the sofa, but he knew such laziness could easily earn him a shock. So he slid off the couch into a kneeling position, submissively awaiting his mistresses’ next instruction.

“Heeeeeey bro,” Ashley smirked, her hands on her hips. “Guess what? We’re gonna play a little game before bed.”

Something about her tone made the hairs on Jake’s neck stand up. Rachel laughed; the fear must have been written plainly on his face.

“Relax, Jakey, you’ll like this! Well, you won’t actually, you’ll hate it. But you’ll like the reward after!”

“You’ve been such a good slave for us today, none of those silly little escape attempts,” Natalie smiled. “So we’ve decided to give you some time off tomorrow. But, you still need to earn it.”

“All three of us are about to take turns gassing you! Non-stop, no breaks, no mercy… until you tap out, or pass out. But for every minute you last now, we’ll give you five minutes of peace tomorrow! Sounds like a good deal, right?”

“Ah, we’re just too generous.”

The girls didn’t wait for their brother to agree; a slave’s opinion is irrelevant, after all. Rachel cleared some space while Ashley dragged him into the middle of the room, and Natalie laid down a pillow for his head. Then he was lying down, looking up nervously at all three of them. And the game had begun.

“Me first!” Ashley cheered. In her enthusiasm she practically jumped onto his face, slamming into him so hard he saw stars; it was a good thing her butt was so ridiculously soft and bouncy, or the impact might’ve broken his nose. His nose wasn’t out of danger yet, however.

Prooooooooooooooooffffffffffffffftt

A sharp, powerful blast singed Jake’s nostril hairs as it filled them with an absolutely rotten stench. His body shook with protest, but he managed to stay completely still as he sniffed it all up. “I might not have been given a choice to play this, but since I am, I’ll do my best,” he resolved. Each fart sniffed was worth five whole minutes tomorrow. He was determined to endure as many as possible.

“My turn!” He just about heard Rachel say, the sound muffled by Ashley’s ass. A moment later the elder sister was taking the younger’s place. As promised, he was given not one second of reprieve before her much heavier, meatier rear settled comfortably onto his head, and he felt her push.

Bbrrrrrrrrrrrrrrrrrrrrruuuuuuuuuuupppppppff

Jake’s eyes widened – the fart stank beyond belief! It was only the second rip of the game, but the sheer shitty aroma almost broke him; he swallowed a scream, along with a fair amount of gas, and fought with everything he had to make it through.

“Heh, I don’t think he liked that one.” Rachel watched her brother’s legs, kicking feebly beneath her. “Who’s next? Nat?”

Natalie shook her head. “Sorry. I don’t have one yet.”

“Ooh, I do!”

Ashley and Rachel swapped once again, and gave Jake even less recovery time than before. This time, the spectating girls heard a pitiful moan follow their sister’s fart, and all three burst into laughter.

“You’d better hurry up if you want a turn,” Rachel grinned. “I don’t think he’s gonna last much longer!”

To his credit, however, Jake did. Fart after fart after fart, with only a few seconds at most in between them… for some time his breaths contained no oxygen at all, his body sustained purely by air from his sister’s digestive tracts.

The stink started nightmarishly bad, and only got worse. He could taste the effects of the takeaway in their gas – egg, soy, garlic, onions, pork, duck, chicken… even a hint of seafood. The spiciest ones were the worst. It was strange how the flavours, so delicious going in, could be distorted into something so horrific coming out.

More than once he came within seconds of giving in. The closest call came when Ashley and Rachel decided they both would blast him at once, pressing their asses to either side of his head and letting rip into both ears; Jake could not recall afterward how he’d survived that one, but somehow he managed it, and the game went on.

“Still alive down there, bro?” Ashley bounced on top of him impatiently. “He’s gotta be close… Nat, switch with me!”

“Mm.”

When he saw Natalie’s ass descending toward his head, Jake actually almost breathed a sigh of relief. Ordinarily, that would be a strange reaction to being face-sat by your sibling, but right now he considered Natalie’s turns the closest thing he had to a break.

His middle sister had been strangely inactive throughout the course of the game, despite usually being the gassiest of the trio. She skipped several turns, and whenever she did sit on him, her farts were small and weak; easy to sniff. At one point after climbing onto his face, she did nothing at all – he heard her claim afterward it had been a silent-but-deadly. Only she and Jake knew it was a lie.

“Is she just being nice? Trying to help me out?” He wondered. Her behaviour was definitely odd, but he wasn’t complaining. Even with her assistance, he was at his breaking point. One more good fart would finish him.

Which, unfortunately, was the exact moment Natalie had been waiting for.

“Game over,” she smiled at her sisters.

Sssppppppbbbbbbbbbbbrrrrrrrrrroooooooooooooooooooooooommmmmmm

For a moment, Jake was frozen in shock. Then the smell hit. Just one whiff of her incredible ass-blast had him retching and wheezing; it smelled like an outhouse, used by a skunk, who had eaten nothing but garbage for a week! Vomit rose in his throat, the taste delicious compared to his sister’s toxic cloud. Jake was done. He slapped desperately at the ground with both hands, pleading to be released.

She stayed seated, however. “I win!” She laughed. Natalie had been going easy on her brother, but not out of kindness, and certainly not because she wasn’t gassy. In fact, it was the opposite. A smelly storm had been raging inside her the entire game, and it had taken all of her focus (and some serious clenching) to hold it in for the perfect moment… right when Jake was at his limit.

“Man, are you kidding?..” Rachel groaned.

“Damn. Well, congrats, sis!” Shrugged Ashley.

Once he was finally allowed out, Jake spent a full minute hunched over dry-heaving. “I can still taste it,” he grimaced, sticking out his tongue. In his disgust, it took him a moment to realise that Natalie was celebrating something. And then he remembered her words…

“I win,” he muttered. “What did you mean… “I win”?”

“Oh, that’s right! Sorry, Jake.” Natalie smiled. “We were playing a game, but you weren’t really the one competing.”

“W-what? I don’t…”

“God, you are slow, bro!” Ashley laughed. “We were having a good old fashioned fart contest! And you were the judge!”

“Not just the judge. The prize, too,” said Rachel. “Since Nat won, she gets you for bed tonight.” She was glaring at him, as though it was his fault she’d lost.

“But… but my reward? The free time tomorrow?”

“Oh yeah, haha! That was a lie.”

“We could honour it anyway, I suppose.”

“We could. Sure we could.” Just from the way Rachel smirked, though, Jake knew for a certainty his efforts had earned him nothing. If anything she looked like she wanted to punish him. But before she could, Natalie had an announcement to make.

“Well everyone, as the champion I will of course be claiming our brother tonight. I have a certain tool I’d like to try out, since I didn’t get a chance on Wednesday. I actually almost left it at home – good thing I like to be prepared!” Natalie rummaged through a bag she’d brought with her, lifting her “tool” to show them all. When Jake saw it his heart sank immediately. A small, see-through cup, vaguely triangular, with a long plastic tube connected to the centre… it could only be…

“A gas-mask,” Ashley laughed. “No way! Does it work?”

“It certainly does,” Natalie smiled. “Once we get this around Jake’s head, the only thing he’ll be able to breathe is whatever enters this nozzle. And that’s not even the best part!” She turned to her elder sister. “Rachel. I feel a little bad, all of us getting two nights with Jake, and you only getting one. Luckily, this mask actually has another attachment…”

Reaching back into the bag, Natalie produced another plastic tube, and Jake’s night instantly became twice as horrific. This second hose still had one end to connect to the mask, but at the other, the tube split halfway through into two different channels. Two nozzles. Two sources to provide air.

“I was going to suggest this earlier, but the game sounded like more fun.” Natalie shrugged. “So Rachel, what do you say? Want to bunk with me?”

“Sounds good, Nat!” Her face had lit up, her expression one of pure evil delight. “Can you believe it, Jakey? You’re spending the night with both of us! This must be your dream come true!”

“Not a dream,” he thought. “A nightmare.” But he would never dare say the words out loud.

*

The bed was comfortable, at least, with its feather-soft quilt and memory foam mattress. And it was huge, too. There would be plenty of space even with three bodies occupying it. It really did seem like a delightful place to sleep; it was a shame Jake wasn’t going to be able to enjoy it.

It was late now, and he was sat on the edge of the bed with Natalie and Rachel to either side of him. They were just making the final preparations now before the sisters could go to sleep, and their brother’s eight-hour torture session could begin.

“Any last words?” When he sadly shook his head, Natalie slipped the gas mask around his nose and mouth, fastening the strap to fix it into place. The mask effectively doubled as a gag; there was nothing actually preventing him from speaking, but his voice was muffled enough that neither of his sisters would be able to understand him.

“Looking good, Jakey. That really suits you!”

“Yes, I think he’ll be wearing it often in the future,” said Natalie. She gave him a quick pat on the head and stood up. “Okay! I’m just going to the bathroom before bed. Feel free to, ah… plug him in.”

Once she was gone, Rachel turned to face her brother. She winked at him, picking up her end of the tube and playing with it. “Nice day, wasn’t it, Jakey? I know I had a great time. This place is so relaxing!” She stood up, hiking her panties to the side and bringing the hose closer. Jake braced himself… but she stopped suddenly. “So relaxing… that I almost forgot to punish you for Thursday night.”

Jake’s blood ran cold. “Oh shit. Oh shit! She remembered!” He heard a low growl from Rachel’s stomach, and she put a hand to it, wincing slightly.

“Oof. See, right around now is usually the time I’d be taking my evening dump. But just for you, Jakey, I’ve decided to skip it! Should make my farts just that extra-bit smellier.”

He groaned miserably, but Rachel wasn’t finished.

“It’s actually pretty risky though. I mean, I really need to shit, haha! I genuinely don’t know if I can hold it in all night. And if an accident were to happen, with this tube connecting directly from my asshole to your face?..” She put her hand over her mouth. “Oh man. I’d hate to be you then!”

Under the mask, Jake’s jaw hung open. “No… please! Don’t!” He begged. “I’m sorry! Don’t!”

But she already was. With one quick shove, the other end of the tube was sealed… and an awful, fetid stench was already filtering through, pumping almost directly up his nose. It was bitter, earthy. A promise of worse to come.

“I warned you there would be consequences for failure, Jakey…”

A moment later, Natalie returned. She looked at the pair of them and smiled. “Ready?”

“NO!” Jake screamed. He immediately began to plead with his middle sister – surely she wouldn’t let this happen? But the mask reduced his frantic explanation to a series of incoherent babbles. Desperately he grabbed the straps and attempted to wrench it free, but Rachel seized his hands.

“What’s gotten into him?” Natalie frowned.

“Guess he’s getting cold feet!” Rachel chuckled. “Can’t say I blame him. But don’t worry, I have cuffs.”

There was nothing else he could do. Bound and helpless, he allowed himself to be dragged limply under the covers while his sisters settled in; all he could see in front of him was their feet, legs and asses, Rachel’s thick and fleshy, Natalie’s smaller but shapely. And the tubes, leading directly into both of their cracks, his only source of air for the rest of the night.

Fffffffffoooooooooooooorrrrrrfffff

Bbbbbbbbbbbllllllllaaaaaaaaaaaaaapppt

Two farts bubbled near-simultaneously out of both their rears, rippling down the tubes and combining to form one nauseating, fetid fog. He felt the heat on his face, the wind in his nose. It was bad enough to bring tears to his eyes.

He could only pray it was the worst thing that would happen to him tonight.

Sunday

It wouldn’t be long now, Jake knew.

He felt the tube to his right rumble, and a moment later a cloud of noxious gas belched out of its opening into the mask secured to his face. Humiliatingly, he’d sniffed so many of his sister’s farts that he could tell it was one of Rachel’s from the smell alone – greasy, spicy, uniquely beefy. And as had been the trend for the past two hours, just a little bit browner than the one before.

“It’s almost here,” he thought, with an ever-increasing sense of dread. Very soon now Rachel’s terrifying threat would be realised, and something worse than gas would come barrelling down that tube.

Jake was currently trapped in bed with two of his sisters, sharing the space beneath the covers with their lower halves; each had a tube extending from their asses to the mask attached to his face, providing him his only air supply. That was awful enough by itself, but his situation was in fact even more dire. If he didn’t escape soon, the night might well have an unpleasantly sticky end.

He flexed his wrists painfully, hoping he might suddenly find them un-cuffed. No good. He looked at Natalie to his left, slumbering peacefully, (mostly) unaware of his present shitty situation. If he could only talk to her… but the mask he wore acted as a gag as well as a fart delivery system. Any effort he made to communicate would only translate as a muffled groan, and would probably wake Rachel up as well, pissing her off even further.

No, there was nothing he could do but lie still, huff farts, and anxiously await the inevitable.

He heard Natalie sigh quietly, and then the left-hand tube activated, releasing a smooth, warm wind into the mask. Rancid. “But at least hers don’t smell like she’s about to take a dump.” Jake was just thinking how insane his life had become, that he found himself appreciating one fart just for not smelling as bad as another, when the horrifying sound he’d been waiting for finally arrived.

BbbbrrrrrraaaaapPPFPFFSHSHHHHBBLPSSSHHHT

“Oh God.” Suddenly the end of Rachel’s tube sagged, as something heavy weighed it down, and a thick bitter stench assaulted Jake’s nostrils, ten times worse than any fart. “Oh God… No!” He retched instantly, and all concerns of irritating his sisters vanished – he needed out of this situation, now.

“Natalie!” He called out desperately. “Rachel? Guys!?!”

There was no response; if they could hear him, they weren’t acknowledging it. Panicking, Jake renewed his struggles to escape his cuffs, wriggling his entire body from side to side. But the motion only helped accelerate the mass in the tube. He could feel its weight sliding, further and further, inch by inch toward his face.

“Nat – ack!” A thin trickle of ass-juice had reached him in advance, dribbling onto his lower face. He clamped his mouth shut, but not before his tongue received a taste of that rancid, acrid slime. He shook his head wildly in disgust.

And then it was here. The thick brown sludge was right at the edge of the mask. He could feel the heat radiating off it as it teetered on the edge, the ungodly stench so powerful in his nose that it eclipsed all other feeling, except fear; because he knew any second now it would fall inward, with nowhere to go but his nose… and mouth.

“No, please,” he whimpered. He thought he felt movement beside him – was somebody finally stirring? – but it was already too late. Rachel farted again, the tube vibrated, and the mass began to tip. “Please, I can’t! Please! Rachel, don’t make me eat your – ”

*

“– shit!”

Jake sat bolt upright, heart pounding, forehead dripping with sweat. In his state of delirium, it took him a moment to remember where he was; no longer trapped in bed with his sisters, but returned safely home, lying quietly in his mother’s bedroom.

“…Shit…” Slowly he lay back down, steadying his breath. “A flashback.” He must have drifted off and had a nightmare about the events of last night. “Why did I have to dream about that, though?” It was an experience he’d prefer to never think about again.

In the end it had been a very close call. Mercifully, his thrashings had awoken Natalie, who had rescued him before he’d been forced to swallow anything… but sadly not before he’d gotten a taste of Rachel’s “chocolate”. The flavour was indescribable. It went beyond “gross” or “vile”; he’d spent over an hour dry-heaving, and even now the memory of it had him feeling ill again.

Afterward Rachel had feigned innocence and even apologised, but everyone else had been pretty upset with her. Their Mom especially. “I told you, your brother isn’t ready for that yet!” She had scolded. “A new slave’s mind is delicate. You have to be careful not to push him too far!”

Since then, Jake had enjoyed the most peace he’d experienced all week. The rest of the night he’d spent with Natalie, which hadn’t been too bad. Although once again he’d woken up from strange dreams involving asses and chanting. “That seems to happen a lot with Natalie, for some reason.”

Then the morning after, breakfast, and the car ride home had each been almost entirely fart-free – and now they were all back home, he was even being allowed time alone! The proximity range on his collar had been temporarily extended to cover the house, giving him a chance to recover fully, as well as to think about his final decision tomorrow.

“A decision I’m still no closer to reaching…”

He sighed miserably. In less than 24 hours he’d have to decide whose farts he’d be sniffing for the rest of his life, and he still hadn’t got the first clue who to pick. If his life was going to be hell no matter what, was there even a right answer?

Suddenly a knock on the door interrupted Jake’s brooding. He glanced over to see his Mom leaning in and waving at him, and he felt a twinge of fear despite her warm smile. Over the past week he had come to fear any interaction with his family.

“Hi sweetie!” Her tone was gentle. “How are you holding up?”

“Um…” He sat up slowly. “Better, I guess…”

“That’s great! Shall we get you belted to my bum for some worship, then?”

“N-no! I mean, I’m still – I’m not – not ready for – ”

“Ahah, I’m only kidding!” She laughed, sitting down beside him. “I know this is a stressful time for you. If you want to rest a little longer, I understand.”

Jake wanted to cry. His Mom seemed so genuine, so warm and kind… so motherly. He knew she loved him, really, and yet she was about to force him to be his sister’s slave! “Would she really do it? Even if I begged?” At least one more time, he had to try.

“…Mom?...” He began.

Fffbbrrrrurrrrrrf

There was the sound of a heavy thud as his mother farted squarely into the mattress. For once she made no move to grab his head and sit on it, or cup her gas and hold it to his nose, but the stench was fierce and soon wafted over to him anyway. It smelled raw and earthy… she’d been eating vegetables, definitely. Cauliflower? No, broccoli. And there was a cheesy tang in there too…

It was several seconds before Jake realised what he was doing; willingly, without any kind of instruction or coercion, sniffing up his own mother’s fart. His eyes widened in horror, while she smiled knowingly at him and gently stroked his hair.

“I told you on Monday, honey,” she said softly. “You’re a natural born sniffer. My little fart-vacuum. You just need to learn to accept it.” She gave him a final pat on the head and stood up. “Now then, today’s schedule! You’ll need to go visit each of your sisters one more time, so they can make their final attempts to persuade you before tomorrow. Afterward I’ll see you again this evening; you’ll be spending your final night here with me.”

Jake watched her go, still shocked at his own body’s response. “I just wasn’t thinking,” he assured himself. But was that even worse? Why would sniffing be his first instinct when smelling a fart?!

His Mom stopped at the door, looking back and smiling at him. “I know you’re still resting, but don’t keep the girls waiting too long, sweetie. One of them should still have your remote, and you know how impatient they can be!”

And then she was gone. Jake lay back down for a while, trying to enjoy just a little more peace, but quickly realised it was impossible. His head was a mess, and he couldn’t relax knowing his collar might electrocute him at any moment. Only a few minutes passed before he gave in and stood up. He was choosing his duties over rest and relaxation.

Like a good little slave should.

*

Ashley’s room was the closest, so he went to her first.

It was obvious from the smell alone that she’d just been on a run – the second he entered he was hit by the stink of perspiration, reminding him of a used locker room after gym class. Her appearance confirmed his suspicion. Ashley was lying prone on her bed, dripping sweat from head to toe with visible damp stains in both her pits and the crack of her booty shorts. Her long, golden-blonde hair was matted, and when she looked back at him over her shoulder, her cheeks were flushed red.

“Hey bro, you’re just in time!” She grinned. “Quick, get behind me and lie down. I gotta rip ass.”

Her words alone made him feel nauseous, but he obeyed quickly enough regardless. In a matter of seconds Jake was in position and already obeying her next command, to pull down her shorts. She was so sweaty he could actually hear them peeling off her skin. And once they were off, the foul odour of her ass intensified tenfold, jets of raw and salty air steaming up into his nose. He gagged but remained still.

“Hmm. I can’t quite…” Ashley was flexing, but nothing was coming out. “Sorry bro, it’ll just be a sec. While you’re down there though, why don’t you give my ass a clean? It’s kinda sweaty, don’t know if you can tell!”

“Yes mistress,” Jake groaned. He stuck out his tongue and lapped gently at the side of his sister’s cheek, shuddering with disgust at the salty flavour.

“Ewww!” She giggled. Then her voice became serious. “Do it again.”

So he did. For the next few minutes, Jake dragged his tongue over every inch of her soaked, sticky butt, swallowing enough perspiration to fill a shot glass. Then two, then three. He tried to focus on her cheeks as much as possible, unpleasant and large as they were, but eventually could put aside her reeking crack no longer; he lowered himself slowly downward just as Ashley helpfully pulled her panties to the side.

Ssshpppppppffffaaaaaaaaarrrrrrraaaaaaaaappp

Suddenly her butthole pulsed, and a loud, flapping fart sputtered out at Jake’s face, showering his face with droplets of sweat and ass-juice. Both his senses of smell and taste were attacked, as the spray covered his outstretched tongue while the rancid gas swirled up his nostrils. He choked instantly. It was hard to say which was worse.

“Looking good back there bro!” Ashley laughed, holding up her phone to record his reaction. “This’ll be great for the Insta! You remember, right? I told you Tuesday I was setting up social media accounts to show the world how devoted my little ass-slave brother is. I can’t wait to start posting tomorrow!”

“Fuck…” Jake had forgotten. His sister was already a popular influencer, with a sizeable internet following; if she wanted to, she could well end up making him famous. For all the wrong reasons.

Ffooooorrrrrrppp

“Ooh. Oh yeah, also, check this out!”

She turned her phone so he could see the screen. He looked up wearily, expecting to see some humiliating photo of himself half-buried in her crack… but no, this looked like… a text-chat? He squinted to read the messages.

> no u didnt

> im doing it right now

> hes licking the sweat right out of my ass

> omg i just farted

> xD xD xD

> hahahaha nooooo

> ur doing this to ur brother????

> holy shit thats so hot xxx

> i want a slave so bad

Jake couldn’t believe it. This wasn’t just one person, but an entire group chat of attractive girls, all of whom seemed to be loving the fact that she was torturing him! He knew a lot of these names and profile pictures, too – Ashley’s friends from her old cheerleading team, fellow Instagram models, and… “Oh no…”

“Man, Katie is really into this. She keeps asking me to send more videos!” Ashley laughed. “Didn’t you have, like, a weird crush on her?”

Katie was his sister’s best friend, and probably the most beautiful girl Jake knew in real life. She was a gorgeous brunette, slim and toned, with an ass not quite as big as Ashley’s, but a far bigger chest to compensate. She was smart and funny, and had the sweetest laugh… and apparently, a secret domination fetish.

“They all want to use you too, you know. Would you like that? Worshipping a dozen girls all at once?” She reached back to force his head down into her crack in time for another wet blast. “Ahhh. All you gotta do is pick me, bro. You’ll still mainly just be serving me, but I’ll bring friends to the house sometimes, and throw parties just so we can all punish you together! Think about it – it’s the only way you’re ever gonna get near Katie’s ass, hahaha!”

Jake tried to think. Serving more women didn’t sound pleasant, but he couldn’t deny they were all attractive. “And Katie…” He liked her, it might be nice to see her again. But… as her fart cushion?..

“I mean obviously you’re picking me anyway. But that might be an extra little incentive for you, huh?” She tossed her phone to the side and lay down fully, resting her head on folded arms. “Mmm. Now! I know you need to go see Nat and Rachel, but you’re not done here yet, bro. My butt still feels pretty nasty! Better get to work, they might be mad if you’re late visiting them.”

She was right, he knew. Jake plunged his head downward without another word, licking at double speed; he sniffed her farts, swallowed her sweat, and thought to himself all the while about the “perk” she was offering.

*

Jake decided to visit Natalie next.

He found her, predictably, sitting at her desk reading a book. She looked up as he entered, brushing her strawberry-blonde bangs out of her eyes and smiling at him.

“Hi Jake. I’ve almost finished this chapter. Why don’t you come over and join me?”

She asked nicely, but it was a command all the same. With a quiet “Yes, Mistress,” Jake approached the chair, falling to his hands and knees once he was beside her. Then, once she leaned to one side to accommodate him, he slid his face under her ass and promptly became her pillow.

“That’s good,” she murmured idly, turning to the next page. “Very good. You’re a good boy.”

Pprrrrrraaaaaaaaaafffffffff

His reward for good behaviour, unfortunately, was an airy fart that stank of expired yoghurt. He sniffed it up dutifully, catching a whiff of an earthier scent beneath; Natalie was wearing thin grey leggings, and the fabric was doing very little to filter the smell of her actual bare butt.

Stench aside, however, the task wasn’t too unpleasant – certainly not compared to the other horrific things he’d been forced to do this week. Natalie wasn’t heavy, and while she farted the most of his sisters, they were usually the least smelly. It was warm, soft, quiet… almost peaceful, in a weird way.

When she eventually stood up off of him, the sudden cold came as quite a shock, and for a single mad instant he almost pressed his face right back into her crack! He shook his head, dazed, while Natalie giggled at his confusion.

“Hey Jake.” She said. “What do you think of my ass?”

“Y-your ass, mistress? I…” She put her hands on her hips and bent slightly, giving him a better look. “What am I supposed to say? She’s my sister!” It was a nice shape, he supposed, he couldn’t deny that. Not too big, nice and curvy. Bubbly enough that you could get a nice handful… it looked good, he had to admit… it was sort of… inviting… before he knew it he was leaning forward again.

“God!” He jerked backwards in disgust, disturbed by his own actions. What was wrong with him today?

“Ha, amazing! Such a clear effect on the psyche, and after only three sessions!” Natalie was already scribbling down her results. “Sorry, I’ll explain in just a moment – here, sniff these.”

She tossed a pair of panties at him, hitting him square in the face. “What – ack!” From the awful smell, they had been worn thoroughly and recently. “What effect?” He gasped, once he’d untangled himself from the lingerie.

“Oh, I’ve been running a little test on you since Wednesday. A psychological experiment,” she said. “Once Wednesday morning, again that evening, and just last night for a few hours; I had you all to myself, sleeping and defenceless. So I put these over your ears.” She held up a pair of headphones. “See, I have this friend studying psychology. She helped me make a custom playlist, looping several hours of subliminal messaging and mental conditioning, all designed to make you dependent on… my butt.”

Jake’s jaw hung open. “You mean?..”

“Yep! You listen to this enough, and pretty soon you’ll be addicted,” she smiled, turning back toward him. “To me, my ass, and all the smells and tastes it has to offer.”

“So – so I’ll start to like it? Being your fart slave?”

“Well… no, haha. You’ll always hate it. They’re farts, they smell, I can’t change how your brain processes sensory information – and even if I could, I wouldn’t. You not liking this is actually part of the enjoyment for me. But,” she picked up her panties and wrapped them back around his face, “It’ll be an easier life for you, right? No more forcing yourself, just letting your body take over, gulping down my gas like oxygen no matter how badly you want to pull away… we wouldn’t need this anymore, either,” she flicked his shock collar. “Once you’re fully addicted only my stink will satisfy your cravings. Even if you ran away somehow, you’d come crawling back in less than a week, begging me to fart down your throat. Wouldn’t that be nice?”

Jake tried to think as the rotten stench of her panties wormed its way up his nostrils. “Becoming addicted…” It sounded horrible, honestly. But if he had to live as a slave no matter what, maybe it was better to have no free will at all?

“My opinion might be biased, but I really think you should pick me, Jake. Become my slave, and in just a few months… half a year, tops… I’ll have your mind broken, permanently.” She smiled pleasantly. “Now, before you go see Rachel, I think I still have a few more farts for you. Would you rest your head back down on the seat please?”

Jake was in position before he even realised it. Was that part of her conditioning? Or just his slave training? It was impossible to say. He looked up fearfully at her smiling face before she turned to sit back down.

“Mmm. That’s my good boy.”

*

“Hey Jakey. Saved the best for last, huh?”

Jake stood apprehensively at the door of Rachel’s bedroom, watching her dominate a League game. “If only that was all she was interested in dominating.” Right now she was focused completely on her computer – she didn’t even look away to address him – but from the looks of things she was only a minute or so from securing the win, and immediately after her attention would be on him.

“Fuck yes!” She announced suddenly. “Easy win! Man, I’m just too good, it isn’t fair on everyone else.” She swivelled her chair around and locked eyes on her brother. “Now then.” She grinned at him hungrily. “Let’s make ourselves comfortable, huh?”

She grabbed him by the collar and shoved him onto her bed, despite the fact she could have simply ordered him there. Once he was lying on his back she joined him, walking across the mattress and squatting over his chest before suddenly dropping; the impact knocked the wind out of his chest, but Rachel quickly resupplied him.

Prrrrroooooooooaaaaaaaaaaaaap

“Eughh…” Jake first felt the bubbles burst angrily against his chest, before the milky stink began to breeze lazily toward him. He started to squirm, but Rachel’s legs were wrapped tight around his head. A quick flex stopped him dead.

“Look at me.” He stared directly up, meeting his sister’s piercing blue eyes. She smiled approvingly and slid her body forward until her pantied crotch rested comfortably over his mouth. “Good. Don’t look away.”

Bffffffaaaaaaaaaaarrrrrrrrff

The gas billowed directly into his mouth, spicy and dense. Jake’s vision blurred as the putrid taste made him tear up, but he made sure to maintain eye contact. They watched each other’s expressions for a moment, him his sister’s sadistic glee, and her, his own disgusted grimace.

“Now, first things first: I guess I should apologise for last night,” Rachel began casually. As though her actions right now required no such excuse. “I didn’t think I’d actually shit, haha. Well, not that much, at least! So. Uh. Sorry!”

Literally no words could make up for his nearly ingesting faecal matter, and this half-hearted apology didn’t even come close – but on the other hand, it was rare for Rachel to express regret for anything. Jake mumbled a faint acceptance into her crotch, wondering where this was going.

“That leads me to my next point, and the question I’m sure you’ve been asking yourself for a while: “Why the hell would I pick Rachel to be my fart-mistress for life?”” She laughed at the immediate flicker of uncertainty in her brother’s eyes. “Haha, you don’t have to panic! I get it, I’ve been a little rough with you so far. But I promise, I haven’t done anything that those two won’t also do at some point down the line. I’m just helping prepare you for the worst. Like a good big sister should!”

“A good big sister?!” Hearing that Jake almost choked, although that may also have been the s.b.d. oozing down his throat. But… was she right? Would Ashley and Natalie eventually use him for… more than farts… as well? He hadn’t thought so, but suddenly he wasn’t sure.

“Plus, with me at least you’ll just be my slave. I know what those two have planned. Ashley’s gonna make you the world’s most famous fart-eater – you don’t want all that humiliation, right? And Nat might seem nice, but she’s not gonna stop experimenting until she’s made her gas as nasty as humanly possible. And probably not even then! She’s way smarter than either of us, we can’t even imagine what she might have planned.”

“Now, with me?” Rachel spread her arms wide. “Farts, shit, sweat. That’s it. I might mix it up, get you to do some feet or armpit worship… or whatever other gross stuff I can think of, haha – but I promise, of the three of us, I’m offering you by far the simplest life.”

She stood up suddenly, allowing her brother a quick gasp of fresh air, but only so she could turn around; once she was facing the other way, she began to sit back down. Jake stared at her gigantic purple-pantied ass as she hovered it above his face, her words echoing in his mind. “The simplest life…”

“Oh! And there is one other benefit to being my slave, something I seriously doubt the other two are going to provide. Let me hear some really deep sniffing on this next one, and I’ll show you!”

Ssbllllllllaaaaaaaatttttttttt

“Might as well obey,” Jake grimaced, flaring his nostrils and sucking in Rachel’s latest beany blast. At first, his only reaction was a nauseated wince… but then he felt a new sensation. His eyes widened. A moment later his whole body lurched. Rachel was – her hand – what was she doing?!

“Hmm. Feels nice, huh?” She brushed gently against the front of his pants, the faintest whisper of a promise. “Don’t stop sniffing. You go nice and slow, and so will I.”

Bbbfffffffoooooof

“No…” Jake moaned, partly from the stink, mainly from the shame. It felt good… so good that he didn’t want it to stop. But – no! This was humiliating! “God… she’s my sister!”

“No? I think yes!” Rachel grabbed him suddenly, and if not for her sitting on him he might have jumped right off the bed – but then just as abruptly, she let him go. “But… not right now. You’ve gotta pick me first, Jakey. And even then, you’ve gotta earn it!”

Jake was still trying to regain his composure. “Earn it?..” He gasped, his mind racing as his heart pounded furiously in his chest.

Rachel looked over her shoulder at him and grinned. “Just remember this, when you’re making your final decision,” she said as her ass, bigger than his head, descended to bury him once more. “I give out the harshest punishments… but I also offer the best rewards.”

Bllarttt

*

By the time evening rolled around, Jake was so tired he was almost glad to be going to bed, despite knowing he was spending the night with his mother. Hearing the perks his sisters were offering for his service, rather than helping, had only made him more indecisive; it was yet another factor to consider in the most important decision he’d ever make.

“Maybe I just won’t choose at all. What happens then?” He thought glumly. Probably there would be a horrific punishment, or some torturous game to force him to pick someone, or both. No, he had to decide, and he had to do it tonight.

He pushed into his Mom’s room to find her already waiting for him, lying prone on the bed, her bare arse winking obscenely at him through the custom-made hole in her pajama bottoms.

“Hi sweetie,” she mumbled sleepily at him. “Mommie’s a little tired. Could you get yourself ready for bed? The handcuffs are just over there.”

There was an extra level of humiliation in having to offer himself up to his Mom’s ass over being forced into it. With grim resignation, Jake attached one cuff to his left wrist and climbed onto the bed between her legs, then attempted to reach under her stomach to link his hands together. Thanks to her ridiculously wide hips, it would only be possible if he was buried up to his neck in her crack, so he began the process of worming his face between her enormous, fleshy cheeks.

“Aww. You’re like a little mole, burrowing into my butt!” His Mom laughed, before draping the covers over them. “So cute.” She sighed. “You know, I considered at one point just keeping you all to myself.”

That made him pause. “R-really?”

“Mhm. Who better to show you your rightful place in this world than your mother? My bum is so big, I could keep you warm and safe in there forever… I could chain you beneath my long, flowery sundress and go walking around outside, and nobody would have any idea you were down there worshipping my ass. My own son!” She giggled. “Oh, but that would be selfish. You belong to your sisters, of course.”

Fffffffffffrooooooooooooooooooaaaaaaarrrrrrrrrrrrrrrrtt

“Oh God…” This had to be the worst fart today. Sickly, cloying, sweet and sour and bitter all at once. It took everything he had to continue pushing his head forward after that, to where the stench was even stronger, but somehow Jake persevered.

“Ahh. Anyway. Tomorrow’s your big day, honey!” His Mom chatted as he worked. “You’re nervous, I bet. But don’t be. Whoever you pick, I know you’ll be the perfect slave.”

“Yesh Mmm.” His mouth was pressed tight against her buttocks now; talking had become difficult. But he was finally deep enough to link his wrists. With a final resounding click, he locked himself into his prison.

“There you go! Nice and cosy.” She squeezed her cheeks affectionately, flicked off the light and rolled over onto her back. “Well, goodnight, sweetie! Try to get some rest; remember, tomorrow is the first day of the next exciting chapter of your life.” After that she was silent. It wasn't long before he began to hear her snores.

Hours passed. Or was it only minutes? Darkness, heat, and stink, they were all Jake experienced down here, his entire world. His mother’s rear surrounded him and yet he felt completely alone.

“Concentrate.” He had to avoid despairing. “Focus, make a choice. Ashley, Natalie, Rachel. Harem, addiction, pleasure. Stink, stink, and more stink.”

He found himself reflecting on the past week, and the various horrors he had endured; that life-shattering first day with his mother. Ashley and her treadmill, Natalie's fart box… Rachel on the toilet. Yoga, a road trip, the fart contest, the gas mask, and today’s final persuasions. Easily, it had been the worst seven days of his life.

“So far.”

Because as horrible as it had been, it was still all only prelude. Mere training for the true nightmare which had yet to even begin. At long last, his seven days of hell were over.

Now it was time to decide.

The End

It was hard for Jake to believe how much his life had changed in just a week.

He stared numbly at his reflection in the bathroom mirror, and hardly recognised the man looking back. He’d washed the sweat out of his hair, cleaned the stains off his face, spent half an hour scrubbing every last particle of ass and farts and waste off his teeth… but his eyes were those of a stranger, wracked with pain, fear, and exhaustion. “A slave’s eyes.”

Seven days ago, he’d been told he had to pick one of his sisters to serve as their fart slave. And a few hours ago, sometime in the middle of the night while sniffing up his Mom’s rancid s.b.ds, he’d made his choice. All that was left was to announce it, and his life of servitude would begin.

There was a polite knock on the door. “Honey?” His Mom called. “They’re waiting. Are you ready?”

“No.” He thought. “Never.” If he had any choice, Jake would have preferred to lock himself in the bathroom and never leave again rather than face his fate. But then she was only asking him as a courtesy. If his Mom wanted she could have him out in about three seconds, writhing in pain as his collar shocked him repeatedly.

When he opened the door, his mother looked him over and beamed with pride. “Oh, very nice, sweetie! All freshened up. You need to look your best – this is a day of celebration, after all!” She took his hand, giving it a reassuring squeeze. “Shall we head downstairs?”

“Yes Mom.” He tried to start forwards, but she stopped him, raising her eyebrows inquisitively. Jake knew what she wanted. He didn’t even try to fight, just sank slowly to his knees, held onto her hips for support, and planted his face into the crack of her fat jean-covered ass.

“That’s my boy.”

Bbbbbblllllllloooooooooooorrrp

Jake sniffed at the sharp, cheesy fart almost robotically as they walked through the hall and down the stairs. Even as they descended the steps, and her tight denim crack pinched at his nose, he barely registered the pain; he was completely distracted by thoughts of his immediate future. The decision he made now would determine the entire rest of his life, after all. If he got it wrong… there was no going back, ever.

He found his sisters waiting for him in the dining room. Like him, they had dressed up for the occasion. Ashley and Natalie, who were stunning on your average day, wouldn’t have looked out of place at a red carpet event, and even Rachel had made a rare effort to look good.

Jake looked at the trio as he passed them, and felt another wave of unease crash over him.

“Should it be her?” He wondered yet again. There was still time, even now, to change his mind. But not much.

“Here, sweetie, take a seat.” His Mom sat him at the head of the table, and he looked up at his family standing all around him. They loomed above him like giantesses, casting long, dark shadows over his insignificant little form.

“It’s finally time, bro,” Ashley grinned at him. “Ready to begin our new life together?”

“Ignore her, Jake.” Said Natalie. “You know who you should pick.”

“Yeah, me.” Rachel let out a belch. “Can we hurry this up? I’ve got good gas going to waste.”

“Go on, honey.” From behind, his Mom placed her hand on his shoulder. “Whenever you’re ready.”

This was it; the moment this past week – or maybe his entire life – had been building to. He looked between each of his sisters one last time, remembering their threats and assurances, their attitudes, desires, unique little habits…their stink. But most of all, he remembered the futures they had promised him. “A simple life.” Those words came echoing once again through his mind, as they had all last night. “Her. It has to be her.”

“I choose…” He swallowed, and turned to his eldest sister. “Rachel. Please, let me be your fart slave.”

And it was done.

Instantly, the room seemed to erupt. His Mom was cheering words of congratulation, as was Natalie (although she was trying, and failing, to hide a look of disappointment from her face). Ashley was silent; Jake could see her mouthing the words “…are you fucking kidding me?..” with an expression of sheer disbelief. But nobody made more noise than Rachel, who was whooping and hollering so loudly you’d think she’d just won the lottery.

“FUCK yes! Called it from day one! Hahaha, sorry guys, little Jakey just loves his big sister’s ass too much!” She strode toward him. From his seated position, he was eye-level with her crotch; she pulled his face possessively into it, stroking his hair while he squirmed against the soft fabric. “Breathe it in, Jakey. Your new home!” She sounded almost euphoric. “So, what happens next?”

“Oh, there’s lots to do, honey!” Said their Mom. “Forms and documents to be signed, the will needs to be officiated, both of you need to pack… and tonight, I think a celebration is in order! But before anything else, let me get a picture of the two of you. I want to capture this moment – the day my son officially became his sister’s property!”

Jake was pulled from his seat to the ground, where he knelt obediently, posing for the camera. Rachel stood in front of him and unzipped the back of her dress; her ass ballooned out in front of him obscenely, and the earthy stink within her crack began to spill out. As the dank, dirty aroma clawed its way up his nostrils he felt more uncertain than ever before… but his choice was made now. Forever.

“Say cheese, Rachel!” Called their Mom. “And Jake – pucker up, sweetie!”

He planted his lips against her cheek, the camera flashed, and Rachel farted. His family were laughing and cheering all around him, and the smell of curdled dairy filling his nose was gag-inducing, but he kept his mouth pressed submissively to her fleshy buttock as it danced and jiggled.

“This… was right. Right?” He tried to reassure himself. “This was the best choice. The simplest life. It won’t be as bad as with Ashley or Natalie… it… it can’t be…” He felt almost sick with doubt, in truth. But there was no point in stressing now. He was officially his sister’s slave; he only had to worry about what she wanted.

Pllllorrrrrrrrrrrpff

If it turned out he was wrong, he only had the rest of his life to regret it.

*

One Year Later

Jake’s 22nd Birthday

Ashley raced down the stairs of the family home two at a time, having just completed a marathon session on her exercise bike. Her cheeks were flushed, her body dripped with sweat, and her legs were so tired it was an effort just to stand; but she found the energy to run regardless. Her motivation was a text message from her sister, confirming the moment had arrived at last.

Jake and Rachel were finally home.

She found Natalie and their Mom already waiting at the bottom of the stairs, by the front door. They smiled pleasantly as she jumped down the last few steps to land in front of them.

“Are they here?” Ashley panted, straightening.

“Just pulled up.” Said Natalie. Now that she listened, she could already hear the sound of gravel crunching on the driveway outside. “Shall we welcome them in?”

Rachel was still approaching the door as they swung it open for her. When she saw her family waiting, her face split into a wide grin. “Hey guys. Been a while, huh?”

“Ooooh, honey!” Their Mom squealed, pulling her daughter in for a tight hug. The moment she was released, Ashley and Natalie followed suit. The four of them laughed and smiled happily as they greeted the elder sibling, asked her how she’d been and showered her with a year’s worth of love and affection.

“Aww, missed you, sis!” Said Ashley, stepping back. Only then did she notice they were missing a family member. “Hey, where’s Jake?”

“Shit, yeah.” Rachel glanced back out the driveway. “JAKEY! What’s taking so long?!”

A few seconds later, their brother appeared, struggling to carry in three massive duffle bags and stammering through an apology. “I’m sorry, I’m sorry!” He whimpered pathetically. He put the luggage down as quickly as possible and threw himself into his mistress’ ass, burying his head like an ostrich in the sand.

“Yeah, yeah, save it.” Rachel rolled her eyes. She grabbed his head and yanked him out, throwing him forward for everyone to see. “Don’t be so rude, slave, say hi!”

“H-h-hello. Everyone.” He glanced up at all of them in turn. When Ashley met her brother’s gaze, she winked; his eyes twitched anxiously.

“Sweetie! It’s so good to see you too!” Exclaimed their Mom. She leaned down for a hug, but she stopped when she got within a few feet. “Oh, phew. You’re a little smelly, hon!”

“Yeah, my bad!” Laughed Rachel. “I did make him wash before we left, but then I hit the Taco Bell drive-through, so he’s been gobbling up mexican farts the whole way over.” She ruffled his hair affectionately. “Really earning the Fart-breath nickname, aren’t ya?”

“Oh well. I know, sweetie – why don’t you hug my bum instead?” Their Mom turned around and shook her massive rear in his face. Obediently Jake leaned into it, wrapping his arms around her waist.

Frrrrrrrrrrrrrooooooooooooooooorrrrrrrrrff

The entire family burst into laughter – except for Jake. He just inhaled dutifully, and when his mother turned away again, he kept his eyes fixed intently on the floor. He looked nervous and jumpy, like he wasn’t sure what he was supposed to be doing without an order to follow or an ass to sniff. “God, what has she been doing to you, bro?” Ashley bit her lip.

The four of them decided they’d all move into the living room together to relax and catch up. As they walked through the hall, Ashley took a closer look at her siblings. Rachel had gained weight, it seemed. About… twenty pounds, if she had to guess? And it had all gone straight to her thighs and ass, making it even more absurdly large than before. Jake, on the other hand, looked much reedier and weaker… but that made sense. She knew what he was being forced to eat, and it was not a diet for building muscle mass.

“Ahh, looks just like I remember! The cabin is amazing, but I gotta say, it’s nice to be home again.” Rachel said fondly as they entered the cosy, warm living room. Then she snapped her fingers. “Jakey! Seat.”

“Yes Goddess!” He replied instantly, practically sprinting forward in his haste to obey. He launched himself towards the nearest couch and lay down in front of it, placing his head on the cushion and staring straight up at the ceiling.

“”Goddess”?” Asked Natalie, raising an eyebrow.

“Huh? Oh, yeah, haha! “Mistress” wasn’t cutting it, he didn’t sound devoted enough.” Rachel sauntered deliberately toward her slave and hovered over him for a moment, teasing him with a view of her behind, but chose to walk past him to the adjacent sofa. “If someone else wants to use him, go for it. I used up most of my gas on the drive over.”

“Ooh ooh, shotgun!” Ashley claimed him before anyone else had a chance. She bounced over and jumped as high into the air as possible, then slammed down ass-first into her brother’s face. The impact was so forceful the entire couch groaned and sagged, but Jake somehow didn’t even flinch.

“Oh honey, not so hard!”

“It’s alright, Mom. Jakey can take it. I’ve put him through worse, trust me!”

“Aww, I’ve missed you so much, bro!” Ashley giggled, grinding herself hard against his head. Her leggings were soaked in sweat; they squelched as she wiggled. “How about you, huh? Have you missed my big soft butt?”

Pffffffffffffffffffffffft

She cut a hard, silent, protein-fuelled stinker up Jake’s nose. Her first face-fart in months… the feeling was just as incredible as she remembered. The warmth, the feeling of his nose poking up into her crack, the soft suction as he inhaled all her rancid gas. The knowledge this was her own brother she was doing this to. There was nothing quite like it.

He’d gotten better at it, too. His sniffing was flawless, silky smooth, and the kisses she felt on her cheeks after were each delivered with a passion like that of a man wildly in love. Ashley sighed, and felt a surge of jealousy toward Rachel, not for the first time since losing him to her half a year ago.

“So, sweetie! Tell us everything!” Said their Mom, once everyone was settled. “A whole year already… how have you both been?”

“Oh, great! Yeah.” Rachel nodded. “It’s been fucking amazing. I eat what I want, sleep when I want, buy whatever I want, game as long as I want… and Jakey here has his nose in my ass pretty much 24/7. So we’re both living the lives of our dreams!”

“And the gaming’s been going well, hasn’t it?” Asked Natalie. “I saw you won another tournament last month. What was the cash prize? $20,000?”

“$25,000. Yeah, I don’t know what it is, I just play so much better when I’m sitting on Jakey’s head! I don’t do as well at live tournaments, haha, but that’s fine. I’m almost making as much streaming now anyway.”

“Streaming?” Ashley frowned. “I didn’t know you were doing that. So what, people are watching you fart torture Jake?” That sounded suspiciously similar to an idea she had once had.

But Rachel shook her head. “No, just games. I think live fart-femdom might be against the Twitch guidelines. I do get a lot of tips just for ripping ass, but no-one has any clue I’m doing it with Jake belted to my butt!”

“I wonder if you’d get more or less tips if they knew they were paying you to fart on your own brother’s face,” commented Natalie with a smile. “Speaking of which. Ashley, give me a turn.”

“Huh?” Ashley squeezed her cheeks possessively, pinching Jake’s nose between them. “No way, I just sat down! I’m not even done farting!”

Brrrt

She attempted to prove her point, but only a managed a small, weak-sounding blast. Despite its size, it must have been smelly; she felt her brother react more strongly than before, though he sniffed it just as thoroughly. He was a professional now, after all.

“Ashley, don’t be selfish. I’m sure you’ll have plenty more opportunities to use him while Rachel’s here.” Scolded their mother.

Ashley scowled, but relented. She lifted herself up, and Jake – who must have been listening – promptly crawled over to his middle sister, as she leaned to the side and patted the warm cushion beneath her invitingly.

Ffffffffffraaaaaaaaarrrrrfff

“Ha… I’d forgotten how good that feels.” Natalie sighed as she sat back down. Then she began to giggle. “Oh! That’s a lot of kisses. I think he’s enjoying himself down there!” She cut another loud fart, and started subtly grinding her ass against his face. “Mmm… he’s really going for it. Maybe he’s changed his mind? Hmm, Jake? Would you rather be my slave, after all?”

Rachel didn’t say anything in response. She just smirked smugly, lifted a leg, and unleashed a seven-second long monster ass-blast.

Jake’s reaction was instantaneous. The family watched with amazement as his entire body jerked, and he began writhing around frantically, in stark contrast to his previous passive demeanour; he practically threw off Natalie in his panic, then rushed over to Rachel so quickly he almost seemed a blur.

“I’m sorry Goddess! Sorry, sorry, I’m so sorry!” He yelped, almost in tears. He dived between her legs and began desperately trying to worm his head under her crotch, to get his nose under her bottom. It was as though he’d ingested a deadly poison, and his sister was sitting on the only cure.

“Yeah, I don’t know, Nat,” Said Rachel, leaning casually to one side so her brother could wriggle into her crack. “I think I’m still number one!”

“…What did you do to him?..” Gasped Natalie, once she’d recovered from the initial shock.

“It took a while,” She replied with a satisfied grin. “I spent like three months electrocuting him every time he "missed" a fart. Even if it was after I deliberately sent him into another room! Now, if he hears me rip one and his nose isn’t already in my butt, he pretty much has a panic attack!”

Natalie seemed lost for words. “That’s…”

“That’s wonderful, sweetie!” Their Mom praised. “I’ve never seen a slave so devoted to his mistress!”

“Yeah, he’s pretty well behaved. You want a reward, slave? Here’s a fresh one.”

Pppppbbbbbbbbbrrrroooooooooooorrrrrrrrtttssssh

Long, bassy, and sputtering, just the sound of the fart made Ashley feel slightly ill. She couldn’t imagine how bad it must smell, especially at point blank range, yet Jake inhaled it without so much as a flinch… even as Rachel squirmed uncomfortably on top of him.

“Oops. That last one might not have been just gas!.. Okay, tongue out, Jakey. You’ve got some cleaning to do.” Rachel hooked her thumbs around the top of her leggings and began working to shimmy them down.

“Ooh, honey.” Their Mom winced. “Not in the living room, please.”

Rachel paused, and a moment later broke into laughter. “My bad, haha! Force of habit. When we’re at home, I just… well, doesn’t matter, you’re right.” She pulled her pants back up and turned her attention to her slave, dragging him out from under her. “Jakey! Go wait for me in the bathroom. I’ll come join you once we’re done talking. It’s about time for your dinner anyway.”

“Dinner in the bathroom.” Ashley shivered. Knowing what was on the menu, she might’ve expected her brother to refuse, or freeze, or resist in some way when faced with such a horrific order. Instead he quickly got up, thanked his mistress for her generosity, and moved to quietly carry out her instructions. All hesitation had been trained right out of him.

Except… just as he left the room, Ashley happened to glance at his hands. They were shaking. Her brother might not be hesitating, but on the inside, he was absolutely terrified. A whole year and he still wasn’t used to his toilet duties.

“Poor guy,” she thought, feeling a momentary pang of sympathy. But only before her sadistic impulses resurfaced. Then she thought,

“…Lucky girl.”

*

Jake stared numbly at his reflection in the bathroom mirror, without any trace of recognition of the man looking back.

It had been some time since he’d looked into a mirror. Living with Rachel, who had company over rarely and left the house even less so, he didn’t find himself on his own very often. In fact, he wasn’t sure he’d had this much time alone since that day, one year ago, when he’d officially chosen her to be his owner.

“The worst mistake of my…”

He shook his head suddenly. “No!” That wasn’t true, he couldn’t let himself think that. Sure, Goddess Rachel was cruel and his life with her was nightmarish. The three months of “no wasted gas” training, the panty prison, the no-showering policy and Laxative Nights were all testaments to that fact. Not to mention his current diet plan. But no matter how horrific she was, either Ashley or Natalie would still have been worse.

…right?

Jake shook his head again, more forcefully. He didn’t have time to worry about past decisions right now – if he wasn’t ready when Rachel came in, she’d soon make him regret it. He got down next to the toilet, positioning himself under a special plastic chair they’d brought with them with a hole in the seat. He was just in time; the second he lay down, the bathroom door burst open. His sister had arrived.

“Sorry to keep you waiting, Jakey!” She said, striding in and locking the door behind her. She looked down at him through the seat hole with approval. “Good seeing everyone, huh? Were their farts nice and smelly for you?”

“Not as nice as yours, Goddess,” he replied robotically. He knew his mistress liked compliments.

“Well, duh.” She smiled, pleased. But then her stomach growled, and her expression became a grimace. “Man, that Taco Bell is not sitting well… we’d better get started. Hope you’re hungry today! There’s gonna be a lot.”

Jake watched with a familiar feeling of dread as his sister pulled down her grey leggings and panties, and her mammoth ass appeared above him. It grew larger as she descended until she was sat fully; her cheeks separated, and her greasy asshole revealed itself between them. It twitched, as though excited by the horror it was about to unleash.

“Not as nice as our custom toilet back home, is it?” Rachel commented on the chair. “Doesn’t really matter, I guess. The shit all goes the same place.” She grunted. “Oh fuck, here it comes.”

No matter how many times he endured it, Jake would never, ever get used to this task. Slowly, sickeningly, the tip of a light brown turd emerged from his sister’s anus. Thick and firm, it grew continuously as it dangled above – three inches, four, five – until it finally stopped at half a foot long. He could feel the heat coming off it already, and the stink… just the smell would have made an average man vomit. He could only stare at it, petrified, trying not to think what it might taste like, but knowing he’d soon find out.

Suddenly, she pinched it off. Rachel’s shit dropped the short distance into his open mouth and splattered heavily inside it. “Oh God. Oh God! It’s vile!” The horrible acrid taste was all over his tongue, so foul and repulsive he had to retch. His gag reflex triggered, his stomach roiled, and tears came to his eyes. But there was no time to waste heaving. He had to eat quickly, before the next log.

When he bit into the turd it exploded, and the hot poo juice inside spread to every corner of his mouth. This time he actually choked, but managed somehow not to vomit up any of his Goddess’ gift. Instead he chewed and swallowed his rancid meal, getting it down his throat as fast as possible. “Not fast enough.” He could already see his sister’s butthole widening above for the next load.

“Mmph!” He moaned, his mouth still full. He reached up to tap Rachel on the thigh, their unspoken signal that he needed more time. She denied it.

“Nope. Sorry. Can’t hold it.” She grunted. “Chew faster.”

The second turd wasn’t nearly as solid as the first, more of a putrid sludge, or a thick wet mud. It slopped messily into his mouth to join the remains of its predecessor, yet the flavour was far worse. More bitter, more acidic, slightly spicy – probably the mexican she’d eaten – and there was so much of it he could barely close his jaw. He knew he needed to swallow, but he couldn’t bring himself to do it. “The taste…” He despaired. “Oh God, it’s so… I can’t…”

“Ohhhh man. Oh fuck.” He heard his sister groan loudly. “Heads up, you gotta open real wide for this next one. It’s gonna be bad!”

Jake’s eyes widened with disbelief. An absolute monster was snaking out from between Rachel’s cheeks – almost as wide as his arm, a third as long, and still growing! The raw stench coming off it could clear a stadium. It was like a train, barrelling inevitably toward him while he was tied to the tracks, unable to move.

“I – I can’t eat that!” He thought, panicking. “I haven’t even finished the second load! I’ll choke – if it doesn’t bury me first!” He was so terrified, he even considered begging his sister for mercy. But as the tip of the horror brushed his lips, the overwhelmingly shitty flavour suddenly and forcefully reminded him of his place. “No… no. I’m her slave.” He remembered, strangely calm. “I don’t need to think, or worry, or complain. I just need to do what I’m told.”

He breathed deeply, swallowed his mouthful of slop, and took the first bite.

Twenty minutes later, with a nauseatingly full stomach and a lower face covered in brown streaks, somehow, Jake was done. Rachel stood up with a sigh of relief, stepping over her brother to wash her hands at the sink.

“Wow, that felt good. Might have been a personal best. I feel like I just lost twenty pounds!” She laughed, then turned back to Jake, still struggling to sit himself up. “You alright? Gonna puke?”

Rachel had spent a long time trying to train her brother not to vomit up her “gifts”. But after six months (and hundreds of brutal electric shocks), both of them had eventually accepted that her shit was just that unpleasant, and he couldn’t always keep it down. Today, however, seemed to be one of his better days. He answered his mistress’ question with a queasy shake of the head.

“No? Great! You can clean me up then.”

“…yes Goddess.” Sadly his work wasn’t yet completed. Such a messy dump had of course left Rachel’s crack a disaster zone, and it was Jake’s task to clean it… using his tongue. Wearily he crawled on his knees up to his sister’s fat ass, pushed himself deep between her filth-covered cheeks, and began licking.

“Mmm, I love this part.” She sighed, enjoying the warm, wet sensation in her rear. “I remember the first time I made you do this. Before you even officially chose me. You’ve gotten a lot better at it since then, huh?”

“Yeth Goddeth.” He replied with his tongue still plastered to the side of her buttock. It was true – he had gotten better, but that didn’t mean the task was any less disgusting or humiliating. Since then, in fact, he’d developed a new reason to be ashamed. As he lapped up his sister’s waste, against his will, he felt himself begin to stiffen.

“Oh? What’s this?” Said Rachel, feigning surprise. As though this wasn’t the reaction she’d deliberately trained him for. “God Jakey, are you seriously getting hard? Just from cleaning my dirty asshole? Ugh, you’re such a pervert!”

Jake was too embarrassed to even reply. He just kept licking.

“I bet you want me to give you a hand down there, too. Your own sister! Such a deviant.” He could hear the sadistic joy in her voice. “…well, what the hell. It is your birthday, I guess. We’ll call this your present.” She thrust her hips back and knocked Jake to the floor, then crouched to squat over his head. “Don’t stop working, though! You’re not getting the slightest touch until your tongue is three inches deep in my ass.”

And so, despite his shame, Jake proceeded to bury his tongue as far up Rachel’s colon as it would reach while she went to work on him downstairs. While he was scraping shit directly off of her anal walls, she was delivering the most heavenly, gentle strokes to his most sensitive area. The conflicting sensations were confusing… but he didn’t want it to stop.

“How did I get like this?” He wondered, groaning as his sister gradually sped up. But he knew the answer to that. She’d conditioned him. At first he’d received his “rewards” for general good behaviour, usually at the end of the day while they lay in bed. But after a while Rachel had decided she would only touch him while he kissed her ass. Then, while sniffing her farts (and begging more for more). Later it was sharts, on days when she had an upset stomach – and now, after a full year, the only time he received pleasure was while he rimmed her anus, and only after she’d taken a shit.

Jake hated himself for it. He still remembered the day he’d realised, to his horror, that regular porn no longer had an effect on him – after so much time associating pleasure with Rachel’s farts and scat, the usual thoughts of pretty girls eager to please him did nothing. Only imagining himself worshipping his sister’s disgusting ass could stimulate him anymore. “Just as she planned.”

Eventually, he knew, she’d take it even further. One day he’d only be able to get it up while serving as her toilet, with a mouthful of waste. She’d make him beg for her shit. He dreaded that grim future, but for now he tried to focus instead on the pleasant feeling on his groin. He was close, and they both knew it.

Just as he was about to burst, Rachel stopped stroking and grabbed him, hard.

“You wanna cum?” She taunted. “Show me how much you want it, Jakey. Get up in there! Deeper!”

“Uhh…” He moaned. The pressure was unbearable; he had to do as he was told. He pressed his face even further up her ass, extended his tongue as far as it could possibly go, probed her sticky, slimy cavern and shuddered at the foul taste. He’d done as much as he could, but Rachel’s hand still wasn’t moving. “Please…” He whimpered. “I’m so close!.. Please!”

Bbbbbbbbbbbbbfffrrrrrrrrrrrruuuuuuuuuupppppppppppppshhhht

Suddenly a massive, bassy fart rumbled out of the depths of Rachel’s bowels, rippled over Jake’s tongue and shot straight down his throat. In that same instant, his sister finished him off. He came to the taste of rotten meat and spoiled cheese flooding his sinuses, and was left coughing and spasming on the floor as his Goddess stood to look down on him.

“Ew.” She grinned, admiring her handiwork. “Cumming to your own sister’s gas, Jakey? That’s nasty. Not many women would help you get off to something so perverted, you know. You’re lucky to have such a kind, understanding mistress!”

“Yes… yes, Goddess…” He wheezed from the floor.

She laughed, shaking her head. “Pathetic.” She washed her hands again, then turned to throw a wad of toilet roll at him. “Clean yourself up, slave, then come back to the living room. We’re gonna have a fart contest to decide who you’re sleeping with tonight. Just like old times!” She walked over to the door, stopped and looked back at her brother. “I’ll give you five minutes, then if you’re not back downstairs with an ass in your face, I’ll start zapping. Oh, and Jakey?”

He looked up at her fearfully.

“Big sis loves ya!”

And with that, she was gone. Jake had earned another few minutes on his own, to scrape the brown stains off his face and the white from his thigh, and think about the direction his life had taken.

“This… was right. The right choice.” He mumbled quietly to himself. Though even he didn’t really believe it anymore. A year ago, he’d been a free man; today, he was a toilet and a fart-eater, cleaning himself up to act as the judge for his family’s gas contest. And the worst part was, he no longer had the energy to care.

Slowly, Jake got to his feet and approached the sink. He avoided looking in the mirror – he didn’t want another reminder of what he’d become. He just wanted to hurry downstairs, and serve his Goddess before he got another shock.

“Maybe I’ll help her win the contest,” he thought dully. “She’ll like that.” And in the end, that was all that really mattered; his only purpose. All he knew was misery, but Rachel was happy, healthy and successful. His life was nothing, his sister’s everything. She was a Goddess, and he was her slave.

As it was always meant to be.