My Sister's Fart Filter
by salhex

PART 1 - The Punishment

My name is not particularly important, but for the purposes of this story, I'll refer to myself as Eddie. My younger sister, who I hate to admit is drop dead gorgeous, we'll call Amy. And to describe Amy, well she's just a bit of a spoiled brat. She always gets special treatment from my mom. Maybe it's because my dad was a piece of shit who was never in my life, and my face (I once found out through a night of mom's tipsy venting) is a little too similar to his for my own good. Being a constant reminder to my mom of that abusive sob never boded well for my odds of getting away with any bad behavior. That said, mom always tried to be fair, not between Amy and I, but when it came to my punishments, she tried to fit it to the crime. When I got caught smoking a cigarette, she made me go around picking up cigarette butts and over trash from the neighborhood streets. When I snuck out one night to a friend's party, she'd made me go to bed super early all week with my door open so she could make sure I followed it. She always wanted there to be some connection with the crime, a reminder of what I'd done so I wouldn't forget the reason I was being punished. To be honest, it wasn't often, I wasn't a bad son or anything as far as I was concerned. But whenever it came to picking on Amy, the punishments were always next level. I once yanked her hair a little bit, she was spraying stinky perfume all over me to mess with me and I was trying to grab it from her, I ended up pulling at her hair which got her to take one of her hands off the perfume, letting me swipe it off her. Mom was livid, she forced me to sit still and let Amy give me a "makeover", which resulted in the most hideous haircut the world has ever seen. She made me keep it that way for 3 whole days before letting me shave my head, which also wasn't great, but it was better than looking like blind Friar monk tried to cut his own hair with some old garden shears, and a bald center to boot...

So you get the idea, don't mess with Amy. Well I knew better than to do it, but accidents happen I suppose. Amy was a pretty popular girl, and she did her best to keep up appearances, but at home she would definitely surprise some people. Like one night, she was having some major chilli farts. She was just letting them rip, lifting her leg, the works. Most people would be shocked to see a girl so perfect acting so vulgarly. All I did was take a little snapchat clip of her ripping ass and send it to a few close friends, but one of them ended up saving it to the chat, downloading it, and it made some rounds... Eventually it got back to her and she was PISSED. She ran to mom, and that's where this story truly begins.

I was sitting on the couch when Mom and Amy approached me and showed me everything that had transpired

"What the hell were you thinking, Eddie?!" Mom admonished me, "Don't you realize how damaging that sort of thing can be to a girl's image?"

"I'm sorry, mom, I didn't think anyone would save it"

"That's no excuse" mom said angrily, Amy behind her shoulder, eyes slightly red, likely tearing up from the experience. I did feel bad, I never meant for this to happen... I knew this wasn't going to be good.

"You humiliated her, Eddie" mom continued, "So if you want to keep being part of this household, you have to know what it feels like to be hamulated in turn, so that this never happens again."

I wanted to speak back but I knew it would only be worse. I didn't have anywhere else to go after all. But what kind of humiliation was she about to demand of me? I waited nerve-rackingly for her next words...

"I tried really hard to think of how to punish you this time, and you won't like it one bit, but I expect you to deal with it. I don't want you to underestimate how seriously I'm taking this, so after talking with Amy, we came up with your punishment.

From now on, whenever you're in this house, Amy will be allowed to fart on you as much as she likes. You're not allowed to hold your nose or breath through your mouth to avoid the smell. Amy will only need to tell you she has to fart, and you will get on your knees before her. Whenever she farts near you, you will be expected to keep sniffing until any smell has dissipated.

"Mom, that's too much, I can-" I began, before she cut me off

"Ahh" she said as grumbly shut-up-buzzer before continuing

"I'm not finished." I tilted my head down in acceptance as she continued my sentencing

"Like I said, you will get on your knees before her and she will fart on you in any way she sees fit. That includes sticking her butt right onto your face to fart if she wants. You will obey her and not resist. If she's particularly gassy, she might want to lay your face down and use it like a seat so that she doesn't have to get up again and again every time she needs to fart. You know how gassy she can get, so I won't tolerate any resistance in this regard."

I was shocked, and I'm sure my face showed it. There was no way this was real, I was dreaming right?! What kind of nightmare had I just unleashed upon myself...

"I know that might seem extreme, but believe me, the humiliation you feel now and will feel sniffing her farts really doesn't compare to what you've put her through." mom explained. I can't say I agreed, but mom was extremely protective over Amy...

I wore a look of pure defeat, but one thing was left unexplained, "Ok, I'll obey, but for how long am I being punished? I don't know if I can survive a whole week like that..." I said trying to sound pitiful and garner some sympathy. I could probably put up with the torment for a couple days, but anything longer than that and I was going to be in hell. Amy's farts were noxious, I was anxiously awaiting mom's response.

"I had a feeling you would ask that, son. Unfortunately, the humiliation you put Amy through isn't a temporary thing, she will carry that scar with her forever, even if it fades, she will always remember it. So your punishment is similarly permanent. Amy will fart on you until she feels you've had enough, or until she's satisfied. But as long as you live here, Amy will be allowed to use you as her fart spot as much as she likes. We'll make an exception for when you have a guest over, but don't think you can start bringing people over all the time to avoid your responsibility. Amy and I agreed on one guest pass per week, any more than that and you'll have to accept that your guests will be exposed to this."

"Forever?! Mom please" I began before Amy cut me off this time

"Yes, Eddie, forever. It's not like you're going to live here forever though, so no complaining. My life might never be the same, what if I become a meme and I'm known as fart girl forever?!", emotion clear in her voice, it was true that I had accidentally caused her some serious distress

"Exactly" mom said in affirmation of Amy's outcry "In fact, I just don't think you truly understand how much you broke our trust in you. So in addition to everything I've already said, I've given full permission for Amy to record or film you in the house. Sniffing farts, or just eating your dinner, Amy is allowed to record and do what she wants with those videos. She's only planning to show her closest friends, but consider being on your best behavior and obeying her without issue so that she won't feel the need to humiliate you to anyone else."

I immediately considered that those friends might to the same as mind had, causing ME to become the meme, and ME to be permanently known as fart boy brother. FUCK, FUCK, FUCK!!! Not good, not one bit of good... In fact, I'm absolutely doomed, aren't I?

"Now, to be honest we don't have high hopes of you not resisting, and I'm not willing to risk anything happening to Amy." mom said, while grabbing her purse and pulling something out of it, "So to make sure you behave, you're going to be wearing this shock collar at all times in this house. At least until Amy feels fully comfortable without it. It has a remote, so Amy can deliver a pretty mean shock if you decide not to obey her orders."

What the fuck was all I could think. Was I a son and brother or a slave to hurt Amy???

"I know you're probably thinking this is overkill, but you are being punished and you'll quite likely have a fight or flight reaction to such a change. If you're good and show that you can handle this change, it will not be necessary." mom said

Is it bad that I could actually understand that thought process... I didn't like it, but I could definitely see myself flailing around taking a disgusting fart to the face.

"We're beginning now, Eddie, so I need to put this on you." she walked over and put the collar on me and then spoke, "Now, this will help, but we still have to make sure you don't overreact to the first time, so I'm also going to be taping your hands together behind your back, I don't want to shoving your sister off on you on pure instinct. If you need a toilet break we'll take it off and then re-apply it, so go ahead and use the bathroom now so we don't have to waste any more than necessary.

I felt like a dog... Being told to go potty before being muzzled up and told to do tricks. Only, the tricks I was supposed to do were being used as a fart cushion for my bratty little sister. This can't be real, I kept thinking to myself, but as I used the toilet and returned to have my hands bound behind my back, then told to sit on the floor in front of the couch, the wake up moment never happened.

"Now, you and Amy have a lot of bonding to do together, and she wanted to do this alone since it's really just between you two, so behave yourself, Eddie, and don't make me come out here to deal with you. This is hard enough on me already, I love you and hate so much that you've made me do this, so I'd rather leave you two to it anyway. I'm hoping you'll adjust quickly so this won't be any harder on me than it already is.

All I could do was nod slowly, my heart pounding as I was about to be left one on one with Amy, who'd been surprisingly quiet while mom was laying down my sentencing. Well, now that we were alone, that was about to change. She had presented mostly hurt when mom was here, but she donned an angry and vengeful expression now.

"Hello, assface." Amy spat, "You know, what you did was really fucked up, so I'm going to enjoy using you as much as possible. You wanted people to see me as fart girl, huh? Well, you're going to get a front row seat, or I guess I am. You're getting a front row ass, on your face that is, because I need to FART."

It took me a moment to process what was happening, only a moment, because she quickly had her finger on the zap button, the electricity causing intense discomfort in my neck.

"On. Your. Knees. Remember?" Amy said, biting off each word.

Right, I WAS supposed to do that. I struggled to get off my ass and to my knees without using my hands, but I was able to after a bit of a strain to do so.

"Better" she said as approached and then turned around, placing her ass to my cheek before letting out a loud airy fart right onto my left cheek. I could feel the air on my skin, the fart managing to still maintain its velocity through her denim shorts. Then the smell hit, and I swear I nearly barfed. Meaty and pungent, I'm guessing she loaded up on leftover chili this morning in preparation for this. I coughed and reflexively turned my face downward and breathed through my mouth.

"You have to sniff it!" Amy said with annoyance, pressing the zap button again "Mom said so!"

She bent forward in front of me and shimmied back to bring her asscrack to my nose , her shorts hugged her ass very tightly, especially when she bent forward like this. For the briefest of moments I was in awe of her shapeliness, but it didn't last long as the smell of fart trapped against her shorts hit my nose. I sniffed, stifling my desire to cough, but not doing a great job. I sniffed and gagged alternatingly but she actually seemed to be ok with it, likely enjoying how much I was suffering at her hand, or rather at her ass.

"Come on big sniffs, don't make me tape your mouth shut." she demanded. I was able to sniff a little bigger now that the smell was dissipating, but then she timed another fart with my breathing pattern so that it shot directly up my nose. I gagged mid sniff, and began coughing, I thought I might throw up, aaaand I did. Just into my own mouth, I reallly didn't want to be pushed more than I already was.

"You're really bad at this, I almost feel sorry for you, but not really because you deserve this." Amy said judgmentally, and I got the impression that she really believed that. She was a huge brat, and this was par for the course attitude for her.

"I didn't even shower today" she said, pulling the back of my head deeper into her asscrack, "how does my butt smell?" she said giggling as I was forced to take big sniffs of it. She kept smearing my nose with her hand behind my head and then let out a hot silent fart that was absolutely horrid. Like I don't know the science behind why some farts were worse than others, but this one was from a special corner of hell. Was I really such a bad brother to deserve THIS?!

This time I did throw up, not a ton, but I couldn't contain it all and some got on her jeans and her leg a tiny bit.

"Uggg, gross! You are so bad at this, holy shit!" Amy shouted, reflexively hitting the shock collar for the highest setting. It zapped me and my vision blurred. The next thing I remember was seeing Amy's annoyed face holding a cup of cold water. Apparently she had cleaned herself up, wiped my face off for me and then poured a little water on me to wake me up.

"Finally back to your senses I see" Amy said bringing the cup of water to my lips.

"Here, drink this. While you still can."

I had thought she was being sweet until the ending, but no...

"Wha?" I slurred, wondering what she meant

"I'm taping your mouth up, I don't want any more or your nasty vomit getting on me, so drink something while you can."

I started to protest when she dangled the remote in front of my face and said

"nuh uh uh, shhhh"

So I gulped down the water and then watched her wrap my head with bondage tape, fully covering my mouth and then pushing me down to the floor again, my face up toward the ceiling.

"I'm down to panties now thanks to you, so enjoy the view", she said gently jiggling and pulling apart her ass cheeks with her hands before bringing her asshole down to my face. "I'm going to sit here and watch tv for a few hours while you learn to be a little more appreciative of your new place in the family." she said, before pulling apart her cheeks to let out another fart.

I was overwhelmed again, my body tried to cough, but with the covering it resisted a little more, thankfully. I really didn't want to find out what throwing up while taped was liked.

I was now forced to sniff whether I wanted to or not, and the smell just seemed to linger forever. Her ass in her grey panties was a lot stinker than her ass was in jeans too. Honestly though, when she wasn't farting it wasn't too bad, the ass and pussy smell of a hot girl, even if she was my sister, was still the ass and pussy smell of a hot girl lol. Her weight made it hard to breath though, especially without my mouth available, so it was really difficult to clear out the last remnants of her noxious gas whenever she farted, which was often, and her farts smelled like pure hell to me. With the difficulty breathing, a new fear was suddenly unlocked of suffocating underneath my little sister's butt cheeks. Maybe she sat too long and didn't realize I had passed out or something? That fear seemed to trigger a survival instinct in me, as I found myself sniffing each successive fart more successfully. And there were plenty of them. Probably one every minute or two, she was relentless. I heard her start taking videos for her friends, "Look, Kelsie!" she began before ripping a large audible fart up my nose, "My brother finally learned his place around here!" Amy said giggling. She sent various videos like that to different friends. Kelsie of them replied with their own video "WHAT THE FUCK GIRL! Is that real? Do I get a turn?!" Kelsie said in shocked laughter.

Amy replied giggling "Mayybe, I'll have to ask my mom first"

Fuck, I was now realizing another fear, group fart sessions. Mom wouldn't allow such a thing would she?

For now I had more immediate concerns, like surviving however much longer this night was going to last. I'd now spent at least 3 hours being facesat by my little sister, constantly forced to sniff her ass and her horrid farts while she just watched tv, played on her phone, and took selfies and videos of my humiliation. As the night continued onward, these 5 words haunted me, ~This is my life now~

FUCK

PART 2 - The Big One

I had now been under my bratty younger sister's farting ass for over 3 hours, probably close to 4, and the disgustingly potent farts just kept coming. It was pretty clear to me that I couldn't be expected to live like this, it just sucked because I had a good thing going living at home. Most of my pals were always complaining about rent and bills and shit, but I only really had to contribute to the bills since the house was paid off. We'd been here my whole life, I didn't want to leave, but with each and every fart, it felt like I was going to have to. The only thing that made it somewhat tolerable was that I had to admit how perfect Amy's ass was. If it wasn't spewing toxic fumes at an incomprehensible rate, I'd probably be able to appreciate it somewhat. It's not like I'd had a girlfriend in a while, so the feeling of a nice ass on the face could have been a small perk, but not like this. I couldn't even protest, my mouth covered in tape. As the night went on, her ass only got more moist and disgusting from sitting on my face.

She would pull her asscheeks apart and release fart after fart into my sinuses, releasing her cheeks after doing so, cutting off any real chance of flushing my senses out with fresh air. I was lucky if I could breath at all, and what I could get was tainted by her sweaty crack. Laughs and giggles, teasing, it was all pretty common at first, but became less so as time passed until she was almost completely ignoring me. I was her brother just hours ago, now I was as if nothing but a seat, a cushion to fart on without a second thought. If I struggled too hard she would give me a breath, but she also shocked me with the collar remote if she felt I had not lasted long enough. Sheesh, I can't really say why I didn't just run out the door the moment this bullshit was suggested, did I actually have no self respect for myself that I would accept such a ridiculous punishment?! In all honestly, I did feel bad about what I'd done, so that was probably why. I still valued our relationship, and I didn't want there to be a huge wedge between us. So if things could just go back to normal after this, we could call it even. If only mom had been reasonable and put a clear time limit on the arrangement. It really made it seem like they were ready for me to move out when I thought about it that way, because there's no way they could expect to subject me to this for long.

Anyways, it was a long and miserable experience that kept dragging out. She watched tv way longer than is healthy, like 5-6 hours. I was thirsty, hungry, I needed to pee at this point too. I thought it was never going to end, and the farts NEVER FUCKING STOPPED. How can anybody fart that much?

Well luckily it couldn't go on forever, eventually mom popped out and expressed her amusement at Amy still sitting on my face.

"Somebody's enjoying their new toy I see" mom said, teasingly

"whaaat" Amy replied in defense, playfully faking offense to mom's words

"It's not good to stay up all night Ames" mom said, using Amy's pet-name "You can fart on Eddie more tomorrow, but he could probably do with a break

Amy huffed, "fiiiine. I'll get up after I get one more big one" then she pulled her cheeks apart and let out a big fart right up my nose. I assume mom gave her a look after that as Amy spoke again

"That was a normal one, mom! I mean a proper big one!"

Mom made an admonishing sigh, "Ok hun, well I'm off to bed, love you"

"I love you too mom!" Amy said cheerfully followed by another large fart.

Apparently that wasn't big enough either... Fuck my life.

It took about 10 more minutes before Amy got a "Proper big one" and she was NOT playing around about what she said. This was one that dwarfed her other large farts. Like when you see pictures of the Titanic compared to modern cruise liners. They're all big, but this fart was MASSIVE. At this stage, I'd inhaled quite a few similar ones already, but this fart was by far the worst yet because my brat of a sister waiting until I was gasping for breath to release it. When you're struggling for air, only to have your lungs injected with pure sulfuric, rotten ass gas, it's almost enough to pass out on. I nearly did, my focus drifting as the stream of gas gas just kept flowing. The stench was unreal, I wanted to vomit but I'd adjusted at this point to mostly turn off my gag reflex. But the fart kept going and I still needed air, so I began to cough and choke on the fumes. I expected to be punished again, but I think for once she was just so proud of herself and her massive fart that my coughing was seen as an accomplishment on her end.

She giggled and snickered to herself "Now THAT is a big one." she excitedly wiggled her butt around on my face, ordering me to keep sniffing it all up until the smell was all gone. We stayed there for another 10 minutes because every time I thought I'd gotten it all, she just say "wait, I've got another one" then let another fart out and make me sniff all over again. But finally she was out of gas for more than a minute and got up.

"Well that that a lot of fun, we'll have to do it again sometime!" Amy said to me laughing before she ran off. She didn't even help remove the tape, so I was still tied up with my mouth covered. I was able to get myself to my feet and stumbled towards her room, I could already hear the shower going... Great, now I had to wait even longer to be free. After about 20 minutes she emerged and noticed me

"Oh" she said in surprise before a smirk appeared on her face "missing my stinky toots already, huh?"

I just grunted at her in my obvious appeal to be released from my bindings.

"Ok, fiine I'll let you out," she giggled "Just hold these for me real quick"

She was holding the panties she just just been wearing and then reached out and stretched them over my face like a mask. The smell of her pussy part very ripe and stinky as she lined them up with my nose. It's not like this smelled any worse than before, but it was very humiliating.

But she did do as she said, undoing the tape from my hands.

"There" she said, "free to go" then she bound off, leaving her panties over my face and the tape still over my mouth for me to deal with myself.

Annoyance fills me to the brim. The experience of the night, the attitude, everything. I was not going to let this continue for long, I promised myself that I would stand up and figure something out. So the panties and tape quickly found themselves in their appropriate hamper and trash can respectively and I took the longest shower of my life. I kept scrubbing my face, but every once in a while I got the subtle whiff of fart stank, like she somehow stained my sinuses with her fart scent. I wanted to puke, and as the scent kept popping up as I tried to sleep, I noted that it might be a good time to try out neti potting...

The next day I was expecting the worst, but to my surprise, it was almost entirely normal. Mom took the collar off me at breakfast since I needed to go out today, and Amy didn't try to face fart me at all. She did run over and fart on my side one time, that was it. I had my concerns for later that evening, but it was more of the same. She would run over and let out a fart on me her and there, but nothing extreme. And what was more shocking is that the next few days went just about the same. I started to calm down a little bit and was beginning to feel like that one night was the true punishment, but there was still a huge fear lingering in my brain that another night like before was destined to occur once more. Was this just the calm before the next storm?