The Fart Jar
by Croatoan658

This story contains female farting, and giantess farting. Read at your own risk.

* This story was written mostly by Croatoan658. We worked in a collab where I added the fart sounds and helped to clear up some grammatical typos and syntax. Otherwise enjoy the story! *

It is a hot summer in California. Roy is 18 years old and he is not very tall, has brown long hair, and brown eyes. He looks stronger than he actually is; Roy likes spending his time playing videos, going to the cinema with friends, going to parties and getting drunk, and he loves playing jokes on his older sister Kendall. She is a tall, beautiful 19 year old girl, really smart, with brown eyes and long blonde hair, she has nice breasts but her best attribute is her big bubble butt, each cheek the size of a volleyball but still firm.

Kendall hates her brother for making jokes about her being a nerd in school and also telling her that she has a fat unattractive ass; Roy also enjoys playing tricks on everyone including his sister so this doesn't make it easy to pass time with his sister without fighting. They love each other, as the siblings they are, but they just don't have things in common.

A week ago Roy made a joke on his sister in which she ended looking like an idiot in front of everyone in school, she got really mad but her sadness overruled this anger. Therefore, she went to her room and locked herself in there for about three days just going out to eat and going to the bathroom.

Roy thought it was hilarious at the momment seing his sister so embarrased but now he was feeling really sorry for being such a jerk with her. He decided to at least give her something while she was alone in her room so he decided to buy some food. She loved mexican food so he thought it would be a nice detail to bring her some Mega bean and meat burritos with extra cheese and some onion rings aside. Kendall was lactose intolerant but she loves eating cheese despite the horrible effects.

He bought the food and went to her bedroom, he knocked on the door but she didn't answer so he told her that he would leave the food outside and he went to his own bedroom. It was next to kendalls bedroom so it was easy to hear what she was doing, all Roy could hear was some strange laboratory noises, like chemicals being mixed and some bottles making *cling* when touching each other. He passed some hours in his room and then he felt hungry at about 7:00 pm so he went downstairs and in his way he saw that the food was gone, he was happy to see that she at least accepted his present.

He made himself a sandwich and watched a movie while eating. When he was done and was about to go upstairs, Kendall appeared with her usual clothes and looking really messy since she hadn't had a bath in this three days. She was wearing a pink sexy sporting bra and some pink panties with white spots. Roy noticed that her bra had some stains of different colours and that she was holding her hands behind her back, she was obviously hiding something with that cute but fake smile in her pretty face.

"Hey, how are you sis? Look I'm sorry about my little prank but you have to admit it was pretty funny!" Roy said without knowing how hard her sister had been working to take revenge on him.

"Yeah sure it was hilarious" she said obviously thinking otherwise. "Look, the burritos you brought me were delicious so I decided to bought you something too, a sign of peace" Kendall said presenting to him what she was hiding, it was a bottle with a green liquid that had some bubbles on the surface.

Roy thought it was her way of taking revenge on his prank but still accepted hoping that it will make her feel better.

"Here you go, I hope you like it" she said.

"Thanks sis" and with that he took the bottle and drank the strange liquid, it tasted awful but Roy decided it was better not to make a comment that could made her mad again so he swallowed. In about three minutes the whole liquid was dranked and Kendall looked really interested in her brothers reaction.

"Did you like it?" she asked.

"Yeah, thanks again" he lied. "Well I'm tired so I think I'm going to bed so... good night big butt!" He said as he began going upstairs. When he was in the second step he felt a gurgle in his stomach and when he looked at his hand he noticed it was really small.

In just 15 seconds he was the size of a baby, and in another 10 he was the size of his hand before he began shrinking, and in 5 seconds more he was just 3 cm tall. Roy was really scared and amazed at what had just happened, he couldn't understand how this was happening and then he looked back at where her sister was. Kendall had a great smile across her face as she knew her experiment has worked. She has just shrunk her brother and at the same time finished her project for the science fair, she was obviously going to win and almost sure was getting an scholarship in harvard with one of the greatest inventions of all time. But right now she had other plans: revenge.

Kendall walked to pick her "little brother" and bring him up to make eye contact with him. Roy was really scared and just stared at the giantess that had him in her palm like just a little bug.

"Awww, you look so cute bro! I hope you aren't as stupid as I think and you understand what is happening. Well I'm tired of you making me miserable all the time, so I thought it would be nice to pass some "great" time with you so we can solve this" she said enjoying each second of her brother's fear.

"Put me back to normal!" he said "what the f*** you think you are doing?! If you drop me I will die!"

"Oh don't worry about that! With your new size you more dense and harder so you are covered in that aspect. I spent this past three days finishing this masterpiece and it was totally worth it. Here, I will show you your new house for the next 48 hrs" she said without being worried about anything.

"What?! 48 hrs?!" he screamed, but she could barely hear him.

"Yeah Roy, it will take about two days for you to go back to your normal size, look I'm not completely sure, this is the first time I make this formula, maybe you could stay like that forever! But hey I will take care of you!"

"Kendall this isn't funny!" Roy screamed "Make me normal again! I'm telling mom if you don't!"

"Listen carefully brother, you are my slave now so shut up or I will go put you in the toilet and flush you to your death, understood?" She said pointing her giantic finger at him.

Roy was confused so decided to do so, Kendall walked to the kitchen with her brother in her hand and took a jar. She relocated his brother inside of it, then put it on the floor and she began the torture.

"Ok bro, this is your new house!" she said with an evil grin.

Roy just screamed hoping someone will hear him but then he remembered his mom was out of the city working.

"What are you going to do with me?" Roy asked.

"Oh you will see" she said as she turned around and began taking her panties off.

"Kendall if you close the jar I'm going to run out of air" he screamed.

"Roy, in a few seconds you are going to have more air than you want" Kendall said in a sexy way. "And by the way, thank you again for the Mega bean and meat burritos with extra cheese and the onion rings, they were the only thing missing in my plan and they were just in time!" She said as a loud gurgle came from her bowels.

 

With that she took her panties completely off and sat her big round ass on the jar, with her asshole right in the middle of the opening. He just stared at the enormous and perfect booty that was above him, it was glorious. Her pink thight anus being spread and making him feel both scared and surprised. It was a perfect ass and he could also get a nice view of Kendall's pussy also pink and tight. Her ass was really sweaty and didn't looked completely clean as she hadn't showered in three days, the jar was already smelling quite bad but as he heard another loud rumble coming from above him he understood what his sister meant by "air". He didn't have time to react as her big sister produced a big, nasty, wet and puke inducing fart that fullfilled the jar in it's first two seconds of being released.

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This fart was a monster, it was a raunchy 7 seconds fart that came with a lot of force, and it was something of another world for poor Roy who received the full impact of her sister's bowels. The fart was really wet and it wasn't a surprise since she was lactose intolerant, it mostly smelled like beans with a little rotten cheese scent. The fart didn't had enough space in the jar so after the impact it was blown up again and escaped through her sisters ass crack.

Roy was in shock, the force of her fart was obviously enough to blow his hair in the nasty air that was now the only thing he could breath. The horrendous gas burnt his nostrils really bad and the temperature in the jar was rising. Kendall just giggled at the idea of his brother suffocating by one of her farts.

"Oh my god! Hahaha that must be a real pain to breath in! And that's just the first one! I hope you like the breeze because it's not stoping anytime soon!" Kendall said. Roy could hear her despite the echo generated in the jar. He was truly scared, in some ocations before he had heard her sister fart but she was always really shy about it. She could blast away some really loud stinkers but she usually does when anyone is around, and Roy had smelled them from the distance or entering to the bathroom after her. But now she was taking her revenge on her annoying brother for being such a jerk; all her nerd and shy acttitude was aside for the momment. She was going to relax and let Roy's present of food make the rest, after all this was the perfect simbolic revenge, he made her feel like shit so now he was going to smell like her shit.

Roy screamed and begged Kendall to take him out of her horrific gas chamber but Kendall couldn't listen with his tiny screams and her ass plugging most of the jar.

"Uuugghh... that's a strong scent" said Kendall taking a whiff of the air that got out between her amazing buttocks. "Man! I don't think you are going to survive today but I wish you good luck soldier" she joked as she began to feel something else. A loud gurgle was heard from her bowels and seemed to got louder. Roy just kept watching her little stinkhole wink at him as she was pushing something awful.

"Ooohh, you hear that soldier? An enemy is going your way, you better take cover because it sounds like it's mad at you" her sister joked as another fart was released in the toxic gas chamber.

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This time it was an airy fart with a really cheesy smell, it was awful and it was about 5 seconds long. Roy could smell the burritos and the onion rings, this fart really added a new scent to the jar and to Roy's nightmares. He couldn't stop gagging and coughing.

"Aaaa that felt good! You should be happy Roy, you love pranks don't you? But I guess it's different when you are the one who suffers the results." Kendall said without even caring to see if her little brother was ok.

"All this farts have been brewing just for you so I hope you enjoy each second because I'm really bloated" she said with a kinky tone in her voice "Speaking of gas..."

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An amazingly strong trumpet fart came from Kendall's ass and exploded right in front of Roy's face, this was another meaty one that carried a little bit of the onions unique smell. It lasted for only 4 seconds but it's force was enough to blow Roy all across the jar and make his lungs begin to hurt.

He was astonished he couldn't believe what was happening, his sister was a giantess breaking wind right in his face without panties and trapping him a jar. He hopped he was just having a nightmare because now the worst part for him was that now he could taste her sisters farts, it was the grossest thing he had ever experienced and it was just beginning. He could taste the baked beans, the black beans and the meat from those big burritos, it made him gag.

"Just for you Roy! The secret ingredient is love... and your sister's bowels" she said while laughing from her own joke. "Alright here comes some more!"

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Four medium sized farts erupted from her anus and added to the jar's atmosphere or as Kendall call it: Roy's new house. They were squeakers but really filled the jar with that inhuman stench that was produced by this sexy and intelligent girl.

"I hope those burritos taste as good coming out as they tasted going in!" she said "And wait until the cheese really affects me, the things down there won't smell like flowers anymore"

Roy heard her and what she said made him tremble in fear, he tried shouting so she could hear him but it was useless since she couldn't hear nothing and even if she did she won't give a damn.

"Ok fartboy I feel a good one coming so be a good boy and open wide saying aaahhh" she waited until he did what she says holding her gas right in the exit of the cannon.

Roy was horrified but knew that if he doesn't do what she says then things could become a real "mess". Kendall waited biting her lip as she was about to blow up but she wanted her brother to truly suffer. Roy took his time but finally opened his mouth wide looking to the storm coming from above, her asshole was heaven and her farts were hell. When Kendall saw that he was in position she unleashed the monster.

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A great bassy fart exploded in the jar inunding it with the foulest aroma yet, it was a 10 second long fart that shooted Roy to the ground facing her open anus and kept him like that with it's unbelievable force. It was like if a truck just hit Roy right in his front; he passed the complete 10 seconds with his mouth open, he couldn't close it cause of the power of Kendall's latest creation. An eggy and beanny stench made Roy gag and cough like he has never had before.

"Jesus Christ! Now that's what I call a fart! I could clear a cinema with that one! Tell me slave, how did it taste? Good isn't it?" She said while bouncing her ass up and down in the top of the jar.

Roy slowly got up feeling lightheaded and seeing kind of blury, he had the worst taste in his mouth of digested onions, beans, meat, eggs, and he noticed some cauliflower in the air. His taste buds felt as if they were on fire. Kendall was detonating bomb after bomb of her natural butt scent, and made the jar's atmosphere really hot and wet. She wasn't holding anything back.

She decided to stand up for a second, giving more space for the gas to exit Roy's new house. Roy finally had a little bit of fresh air despite the smell that was still lingering. She turned around and picked her brother out of his prison with her enormous fingers. She took a whiff near him.

"Uuugghh... bro you should take a shower, you stink!" she joked as Roy was all covered in sweat and farts.

"Kendall, please let me go! I'm really sorry for all the things I've done to you! Please stop, I won't tell mom!" he said feeling really sick and weak.

"Roy I know since you were born and I know when you lie, I see you are suffering and you want to get the hell out of that fart hole but I know you are not really sorry, but you will be" she said grabbing her stomach and relocating him back in the gas chamber. Her stomach was making loud noises and she looked like she was in pain, her bowels weren't done yet and as Roy was sumerged in his stinky prison again he understood the lactose in her sister's digestive sister was about to make the things much worse.

 

Kendall's ass slowly descended back in to position as a gurgling noise could be heard, for Roy it was like a thunder announcing his fate. When her butt covered the jar again, Roy was just smelling all the aftermath of her previous farts with disgust as a wink of her anus made him get on his knees and beg for mercy. His sister couldn't heard him as she was trying to push an evil smell out of her.

"Soldier!" she screamed as she bit her upper lip and pushed hard "Bombs away!"

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And with that another huge fart came out of her ass, shooting Roy back to the floor with his back touching the bottom glass. What was coming out of her was truly a giant, an enormous roaring monster that made Roy wish he was dead.

It was a strong, bassy, extremely hot, brassy, 13 second long fart that made the whole jar tremble with it's force. The jar was shaking like jelly as this wet, puke-inducing blast assaulted all of Roy's scences. This fart was wet as hell, it threw some fart juice on Roy's face and body that also stuck to the walls of the jar, it was a stinky nuclear bomb that made Roy wanna puke. Roy's eyes were watering as the spicy, acidic fart filled his lungs, he could taste everything that Kendall has eaten in the last 12 hrs, he was just her fart slave now. Roy had a lot of problems breathing already, the newest adittion was rotten and hot as hell, that jar was at 40 degrees after that fart. He was gagging and coughing on the smell and the wetness didn't help. He had fart juice in his face that was sticky and hot, it felt like a skunk had just sprayed him, a giant sexy lactose-intolerant skunk of course.

"Oh god! That one hurt! I feel like if my ass is on fire. Shit, my ass hurts! And... *sniff* holy shit! That was wet!" Kendall said proud of her big bubble butt "I hope you loved that one as I did bro! Oh look at the glass, it's fogged up! And my fart juice must be delicious, right?" she said without waiting for an answer.

Roy was in hell, he was suffering a lot and he almost puked after that one. The consecuences of that last blast were also a dense fog that fluded the jar, the temperature and the wetness made the glass fog as some drops began to form on the walls. She was also making a discovery: farts could condense into liquid. Kendall waited sitting there leaving just a little space for the stinky air to leave and some fresh air to enter.

"Okay shrimp! Sadly for you, you are still aware but luckily for you I'm still gassy so you can keep sniffing my ass all the time you want! I feel more wet farts that want to meet you so I'm going to be checking my phone while I release them" she said while picking her phone from the table "So just remember, try to get used to deep breathing and fart juice in your mouth. If you feel thirsty there are some liquid farts forming in the walls, the condensation process is awesome! So lick those drops if the things go to hot in there, and believe me, they will" she said the last part in seductive way, almost believing he was up to doing that by will.

Kendall sat there, checking some messages on her phone as her bowels began to relax and her asshole opened in preparation for the next incoming explosions. Roy stared at her sisters round ass, now he saw it with fear waiting for the next fart to blow his mind and torture him once again.

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Kendall's farts were getting really wet as she said, they were smaller and weren't as forcefuls as the previous ones but still they were noxious. Her farts were each 3 seconds long in average and sounded wet and sticky, they came with a lot of fart juice. They sounded squeaky and weren't too loud but they created a whole new odor that will be stuck to Roy for the rest of his life. These were the classic lactose-intolerance farts, they carried an acid and spicy smell, like spoiled milk, they sounded creamy and Roy could tell Kendall was really enjoying letting them all out. These farts weren't as big in length or force but they came one after the other; it was fart, around six seconds of waiting, and then another 3 second long acid fart. Each fart exploded with a little bit of fart juice splashing the insides of the jar and Roy's entire body, he was covered in her anal juices and couldn't do anything but try to inhale without gagging or coughing. Each fart made Roy wanna puke and indeed he did after 10 min of this torture.

Kendall was distracted with her phone, every now and then she just giggled on how wet and squishy her farts were. Roy was crying both from fear/disgust and because each time he had to breath the smell made his eyes water and his throat feel on fire.

After 15 min of agony and Kendall not giving a damn about her brother, and what seemed to be a rain of fart juice over Roy's house, she put her phone on the table and stood up, picking up the jar to check how bad the smell was. She took a whiff near the top and began gagging on the smell, she almost let the jar fall in her surprise.

"Well, I think that was a bit too much" she said while pinching her nose and seeing Roy covered in her anal juices.

He didn't want to talk because opening his mouth will let the fart juice in his face attack his tongue again, another reason of his silence was that he was about to faint, he was feeling really sick and could barely stood on all his fours trembling.

"Look at you! You are still awake! Barely alive but still! Good job soldier" she joked "Well I think I'm done with you for now, I need to go take a dump. I think you learned your lesson: "Don't ever mess with me again" understood? Ok, now you just have to wait to the effects of my shrinking formula to dissappear, you may be back to normal by the morning of the day after tomorrow" she said as she approached her fingers to pick her brother from the worst smelling jar that has existed.

When she was about to take Roy out of his prison, she felt something in her colon. She smiled evily as she decided to put the jar back in the floor.

"I know what you are thinking bro: "what the hell are you doing now?" And don't worry about that I will take care of you" she said as she made some stretching excercises and rubbed her belly, she made some squats and some waist moving. She was enormous, standing in front of him wearing that sexy sporting bra and pantieless. Roy was only the size of one her toes.

"You might be really tired Roy, so I thought I could help you get some sleep, and like it or not here comes your good night kiss jerk!" she said squatting down over the jar in a very sexy way "Open up slave!" she teased as her ass was once again in position.

Roy was trembling but did what she commanded him, hopping that after this, she will let him go. Her asshole began winking at him as he looked up at it.

"I want to see your tongue sticking out! Do what I command you to or you will help me clean myself after taking a dump" Kendall said as she prepared her ass for the gas explosion, she was brewing a really big one "Here is the big final!"

Roy obeyed having no other options, he heard a loud gurgling noise coming from a really deep part of Kendall's bowels. She was about to break wind and it was going to be bad for both of them.

"Hey bro!" she said "Bottoms up!" Kendall screamed closing one eye, clenching her fists, biting her lip and closing her legs while pushing.

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Kendall's ass just released a 23 second long that reeked of all the things those burritos had in and with a special onion scent. It began with a bassy, loud, sharp and wet sound that made the jar tremble and made Kendall moan in pleasure as she poured devastation right on his face and splashed the glass prison with her anal juices during the first 9 seconds of this eye-watering fart. After 10 seconds it turned into a hot and puke-inducing SBD. This silent but deadly wind dried the interior of the jar with it's wave of hot spicy cheese and onion flavoured air. It was horrendous and while Roy was receiving it face first some of the liquids (her butt sweat, anal juices, and fart juice) got right on his mouth and tongue giving him the full experience of Kendall's raunchy power. The jar became basically an express cooking pot, reaching 42 at the end of the silent fart, and inside of it the worst smelling food was being prepared by the cheff Kendall and her little food taster Roy. The hissing sound of the fart could be heard also as it escaped through her crack of her big round meaty ass, making the gas sound kind of a whistle. It was the greatest fart she had ever produced and she was proud of it.

"Aaaaaahhhhhh!" she exhaled full of pleasure after getting rid of two problems with one shot "Oh my god that was the best fart I have ever ripped! Such a masterpiece can't be wasted" she said while getting up really fast and quickly sealing the jar with it's plastic lid, trapping her recent bomb with his little brother.

After Kendall's greatest fart he felt the lights out, he was going to faint, her latest fart was too much for him to handle, he fell on his back and watched her sister close the jar with the lid just having one little hole made with a needle, it wasn't enough to make the smell go away in anytime soon.

"Good night bro! Enjoy the fragrance!See you in the morning!"

The last thing Roy could see before he passed out was Kendall's pink tight butthole winking at him while she walked away from the kitchen.

THE END