Gumball sat on the couch in the living room, enjoying some alone time as he zoned out in front of the television screen. One of the shows he watched on the regular was running a marathon, playing many episodes back-to-back, so he had been watching for hours on end.

	Some time around the middle of the day, Anais peeked into the living room to see if her brother had left yet. She was the only other person home at the time, but her interest in the TV happened to overlap with Gumball’s, which put her in an inconvenient position. She was polite enough not to demand that he give up the remote at first, instead doing other things around the house to entertain herself. After waiting for several hours, however, she grew impatient and confronted him.

	“Come on, you’ve been sitting there all day!” She said, stamping her foot.

	“Don’t you have girl stuff to do?” He asked, refusing to look away from the screen as he talked to her. He was clearly uninterested in what she had to say, as he hardly changed his expression at all.

	“Grr…” She grumbled to herself. He was really starting to get on her nerves; it wasn’t even the fact that he was hogging the TV so much as it was his flippant and dismissive attitude. “What a halfwit.” She said to herself, making sure the insult was audible to him. Gumball ignored her, so she grumbled and stormed off.

	About half an hour later, Anais returned to the living room. Gumball sighed as she approached, expecting to be pestered. “Again?” He asked her, before she even had a chance to speak.

	“If you don’t share the TV then I’m going to call mom.” She threatened. She crossed her arms as she looked at him, her once frustrated expression now replaced with one of smugness. “She already told you twice not to keep it all to yourself. If she knows you’re doing it again, you’re going to get grounded.”

	Gumball felt a pang of dread in his stomach, but the feeling was overlaid with spite at his sister’s threat. His eyes went wide for a moment, but he quickly returned to a neutral expression. “Whatever. I was done anyway.” He said, finally giving in. He held the TV remote out to her and she took it out of his hand, her face lighting up with glee.

	“Finally!” She said. The rabbit hopped up on the couch beside Gumball, then started flipping through the channels until she got to the right one. Once she was finally free of her boredom, she stopped paying attention to Gumball entirely.

	Gumball let out a sigh, his eyes droopy as he propped his head up on his palm. He had no interest in whatever she was watching, so he stared off into space, trying to think of something else to do. After sitting still for as long as he could, Gumball decided that the most appropriate entertainment would be to exact some petty revenge on his sister. He noticed that he was outside of her peripheral vision, and also that she had foolishly let her guard down after getting one over on him. She should have known better, he thought to himself.

	Gumball lifted his feet up onto the couch and got down on all fours, lowering his body and rearing himself back while swishing his tail from side to side. His feline hunting instinct kicked in, and his pupils grew as he felt a rush of adrenaline flowing into his veins. With a mischievous look on his face, he leapt forward and pounced on the rabbit, taking her down into the couch cushion by surprise.

	Anais gasped as she was suddenly flat on her side against the squishy surface, disoriented. She didn’t know what had happened at first, but when she looked up to see her brother grinning down at her, her face twisted into a snarl of annoyance. Before she could squirm out from beneath him, Gumball wrestled her hands down to her sides, pinning them with ease.

	"Get off!" She demanded, squeezing her eyes shut as she strained her muscles trying to pull her arms free.

	"Not a chance." Gumball said smugly. He snickered to himself as he climbed over top of his sister and squatted above her, his pants-clad butt hovering inches from her face. Anais's eyes went wide as she stared up at her brother's ass in apprehension.

	"You wouldn't…" She muttered in disbelief.

	"Think again, twerp." Gumball said confidently. He wore a toothy grin as he dropped his butt right on her face, smothering her beneath his ass cheeks. Anais let out a startled squeal that was cut short after her brother plopped down on her. She flailed her arms and legs around, grabbing at the cat's hips with both hands while kicking her legs and trying to wiggle away.

	Gumball rocked side to side, grinding his butt against her face as he got comfy atop it. She groaned in disgust as she was forced to endure the feeling of being sat on, filled with humiliation. Her nose burned as her senses were flooded with the cat’s pungent butt musk, which was both sour and slightly salty; a product of the warm temperature combined with sitting in pants that had no ventilation for the whole day. She squeezed her eyes shut as she reluctantly inhaled the stink, grimacing hard.

	"Get a good whiff, sis. You better get used to it too, because you're gonna be there for a while." Gumball said to her. He leaned back on the couch and propped his feet up on the coffee table, assuming a leisurely posture atop her. As he reclined, he squished Anais's face more firmly against his ass, and she whimpered in aversion.

	Just when she thought her predicament couldn't get any worse, she heard Gumball's stomach give a foreboding gurgle. The male held a hand to his abdomen as he felt pressure building up inside of him, and he smirked to himself.

	Gumball leaned to one side, lifting an ass cheek off of his sister's face and allowing her to gasp for air. Just as she went to take in a breath, however, a dry-sounding fart rumbled out from between the male’s cheeks. She coughed as she was hit in the face with a gust of the rotten fog, which clouded her vision and filled her nose with the stench of eggs and spoiled fish. Anais sputtered as her face was warmed and vibrated from the emission, and she began to struggle again, even more fiercely than she had before.

	"Aaah..." Gumball sighed, enjoying the feeling of relief after he had released the steaming fart into Anais’s face. Once the fart ended he leaned back into place, trapping the rabbit again and blocking her off from the small amount of clean air that still remained. "Get a whiff of that!" He teased, snickering in amusement. "Smells like breakfast, doesn't it?"

	As Anais heard Gumball teasing her about the smell, she realized that it actually did resemble what they had eaten earlier that morning. Her stomach churned with nausea at the thought that she was smelling the result of his digested food. Despite her shock and revulsion, she was forced to inhale the rancid fumes that spewed from her brother's butt anyway, being given no other choice between that and fainting from oxygen loss. Trying to free herself, she pounded her fists on Gumball's thighs, and when that didn’t work she clawed at his pants desperately.

	"Urgh! This is foul, even for you!" She yelled out to him, finally getting her nausea under control enough to speak again. He could hear her, but just hardly; her voice was muffled after travelling through the thick layer of butt fat that her face was buried beneath. "Y-You’re going to be in so much trouble!" She warned, trying her best to sound intimidating.

	"Yeah right.” Gumball said, scoffing. “Nobody’s coming home for hours. That means you're my fart cushion until then. Got it?" He asked. To emphasize his point and the dominance he held over her, he cut a wet fart right into her face, eliciting a disgusted squeal followed by labored wheezing as she was forced to breathe it in. She coughed involuntarily several times before the emission dissipated.

	"I-I swear…" She choked out, outraged at what she was being put through.

	"You swear what, you little brat?" Gumball asked, calling her bluff. "Less talking, more sniffing." He told her. She grumbled in impotent anger, and he returned his attention to the television screen. He grabbed the remote off the couch cushion and switched the channel back to what he was watching before, then got comfy on his new seat and smiled as he enjoyed his show.

	Anais made a frustrated noise after her brother started to ignore her completely, as if he didn't know she was there at all. She strained with every ounce of her arm strength to lift his butt off of her face, but he was too heavy, and she only succeeded in tiring herself out. She began to pant as breathing became difficult in the atmosphere between her face and Gumball's butt, which grew damp and humid with heat over time. The intensifying temperature also happened to make the smell worse, and Anais curled her nose at it.

	Gumball watched his show for a little while longer until he was bored of it, after which he turned the TV off and pondered what he fancied doing next. As he thought to himself he ripped a cheesy-smelling fart against his sister’s face, shamelessly allowing gas to rumble out of his ass every time he felt the urge. After his brief burst of flatulence came to a sputtering end, Gumball decided that he wanted to play some video games with his new fart cushion. This had an additional advantage; because the gaming console was in their room, it would be easier to hide from other family members when they inevitably got home, which he knew would be happening soon.

	The cat lifted his butt off of Anais's face and she gasped for air, huffing and puffing and filled with relief that she was no longer being smothered. "F-Finally…" She groaned. She managed to get a few deep breaths in before Gumball stood up from the couch, then grabbed her by her shirt collar and dragged her off of it. Anais felt her energy rushing back as she replenished her oxygen supply, and she struggled against her brother with renewed strength, trying and failing to wrench his hand off of her shirt as he pulled her by it all the way to the bottom of the stairs.

	“Let me go you oaf!” Anais said, fuming at her brother. “You’re sick! I need to take a shower. Or maybe ten…” She said, the smell of the cat’s flatulence lingering in her nose and making her queasy.

	“No way. I’m not giving up my fart cushion that easily.” Gumball replied, snickering. He brought her up the stairs and to their room, where he dragged her inside kicking and shouting. He swung the door shut behind them, and as he walked past it he switched on their TV. He grabbed one of the game controllers that sat on top of it and then took Anais to the center of the room, several feet in front of the screen. Gumball wrestled his sister down again, this time pinning her to the floor on her back.

	"Did you really think you were gonna get away that easily?" Gumball asked, his smile growing wider. He deftly unbuttoned the front of his pants and yanked them down to his knees, then dropped his ass back down atop his sister, this time nude. His fleshy ass cheeks slapped wetly against her face, and her snout became wedged deep within his musky crack. She squeaked in surprise, then her face turned red with anger and embarrassment.

	After parking his sweaty butt on her face, Gumball leaned back to get comfy atop her, sliding her muzzle deeper between his cheeks as he did so. He pressed a button on his controller to turn it on, then began casually browsing through his game library. Anais struggled hard beneath him, desperately trying to escape while she still had her strength.

	The female grabbed at Gumball's ass again, this time her fingers sinking into the fatty mounds that her face was trapped between. She made muffled pleas for help, disgusted by the sensation of her brother's sweaty ass against her face. The increase in temperature also made the smell more intense, leaving her nose filled with the familiar sour reek.

	As if the situation wasn't torturous enough, Gumball reached his free hand back and took hold of Anais by her ears. She winced in discomfort as he grabbed her, then her cheeks went green as he began to floss up and down his buttcrack with her face. He used her fur like he would use toilet paper, cleaning off a large amount of the sweat that had formed on his damp butt cheeks and relocating it to her face instead. She groaned, feeling sick to her stomach as she was used like she was nothing but a sweat rag. When he finally finished wiping himself down with his sister’s face he mercifully released her ears. After the intense punishment she was dizzy and confused, her eyelids lowered in exhaustion. The smell clung to her stubbornly, and she knew that it would take forever to wash off with how sweat-soaked she now was.

	Just to rub it in her face more, Gumball grit his teeth and forced out an obnoxiously stinky fart against Anais’s nose, pumping pure methane into her lungs. With no cloth to filter the emission the smell was much worse, making her gag and retch. Her eyes burned from the spiciness of her brother’s gas, and they filled with tears as she laboriously huffed it up.

	Gumball finally found a game he was interested in, booted it up, and started playing. He ignored Anais like he had before, pretending like he was in his room alone while he sat on her. As she struggled beneath him he occasionally ripped bubbly farts against her face, forcing her to fight with her gag reflex to avoid losing her lunch.

	Anais broke into a muffled coughing fit every time his cheeks rippled wetly against her face, and soon enough she was marinating in a cloud of the stinky, eggy fumes. With no other source of air, she eagerly breathed it in, much to her brother’s amusement. She did her best to think about more pleasant things to distract herself, seeing no path to escape other than waiting for Gumball to get bored of torturing her. She accepted her role as his fart filter for the time being, doing her best to clean up the waste gasses that he expelled into her face every few minutes.

	After what felt like hours enduring the unfavorable conditions beneath her brother’s butt, Anais finally saw a ray of hope. She could hear a car pulling into the driveway followed by its door opening and then shutting, and she remembered that their mother, Nicole, usually got home around this time. Gumball heard this as well, and he grew a bit nervous, knowing that he ran a risk of blowing his cover if he wasn’t careful. Anais would tattle on him eventually, of course, but he wanted to wring out every drop of enjoyment he could while he still had her at his mercy.

	“I’m home!” Nicole said loudly as she walked in the front door, announcing her presence. “Where is everyone?” She asked, noticing that the living room was empty.

	“In my room, mom!” Gumball yelled back, speaking loudly to make himself audible through the door and down the stairs. At first Anais tried to make some noise using her mouth to get Nicole’s attention, but struggled to get out more than a muffled whimper. After that failed she began pounding her fists on the floor, making as loud a racket as she could to tip Nicole off.

	Nicole heard the thumps, but they were quiet enough that she almost didn’t notice them at all. Regardless, she wanted to check up on her family to make sure they were doing well, so she walked herself up the stairs and to their door. She left it shut out of respect for her son’s privacy as she talked to him through it.

	“Where is your sister, honey?” Nicole asked, now speaking with her inside voice.

	“Uh… I think I saw her in the backyard earlier.” Gumball replied. He paused his game so he could focus on not sounding suspicious. “It’s a nice day out, isn’t it?” He asked nervously.

	“I suppose it was quite warm out. I hope she’s enjoying herself.” She said, sounding satisfied in his answer. Just as she went to walk away, Anais mustered up all the air she could and tried to vocalize a plea for help. Nicole’s ears perked up as she heard the faint noise, and she stopped in her tracks to listen closer.

	Gumball grumbled in annoyance as his sister continued to try and escape. He silenced her cries with a raunchy, wet fart, releasing it directly into her mouth with a nauseating bassy sound that echoed as it travelled down her throat. Anais began to retch violently, interrupting her attempt to get Nicole’s attention. The rabbit’s eyes went bloodshot and streamed tears as she was forced to taste the rancid emission, sputtering and coughing as she tried to get it off of her tongue. Gumball laughed quietly to himself at her reaction.

	“That’ll teach you.” He whispered to her.

	“What was that sound?” Nicole asked through the door, puzzled by the faint trumpeting she had heard following the first strange noise.

	“Just playing a game!” Gumball quickly replied. He unpaused it and scrambled to crank the TV volume up. The sound effects from his video game blared, creating an ambience that other quieter sounds disappeared into.

	“Oh! I’m sorry, I didn’t mean to interrupt you.” Nicole said. She smiled to herself sheepishly. “Have fun! I’ll be downstairs if you need me.” She said, bidding him farewell. Gumball listened for her footsteps as she walked back down the stairs, then heaved a sigh of relief once she was gone.

	Anais grumbled bitterly, filled with a sense of hopelessness as the opportunity passed her by. She let her arms fall to her sides, sprawling out on the floor as Gumball went back to playing his game with a grin on his face. She realized that she was out of luck in her current position, and that she would just have to wait until he finally got bored of picking on her before she could escape. The blue cat let out an airy and especially noisy fart into her face and she huffed it up obediently, accepting her role as a fart sniffer.