It was the middle of the night, and Anais was in her brother's room, watching Gumball while he slept. She was completely naked, in contrast to her older brother, who had his normal bedtime wear on as he dozed. She had a mischievous smirk on her little face. 

I wonder what'll happen if I do this...

Anais took Gumball's bed covers and tucked them over his head, then she neatly tucked the rest of the covers tight around Gumball before setting her little pink tush near the blanket opening. Next, she slid her ass under the blanket, her waist and crotch around Gumball's eyes, her luscious, moist cunny settled on his nose. She made sure the blanked was tucked around her as well. 

Here goes!

She pushed and released a gigantic fart on her sleeping brother. 

*blrrrrrrrrrrrrrt!* 

"Aaah..."

The fart was so massive it loosened her virgin asshole, letting another fart rip from it. This fart was wet, and went on for twelve seconds, Anais hushing her excited moans as she gave her unaware brother a Dutch oven. Moist, warm farts kept coming from her stinky hole, taking up or pushing out any oxygen in the blanket and making sure all Gumball's undefended lungs could breathe in was her raunchy gas. Her cunt moistened with excitement. She rubbed her aching pussy against Gumball's nose, letting out bigger and smellier farts for another ten minutes before she climaxed. Sticky juices squirted from her pink pussy, getting Gumball's nose wet as she pushed out another gigantic fart into his breathing air. 

*FARRRRRRRRRRT!*

Anais was getting a sort of disgusting pleasure from this, knowing her sleeping brother was breathing in nothing but her farts, combined with rubbing herself on his person. 

*BLOOOORRRRT!*

Another rippling fart blasted from her loose hole. She orgasmed again, squirting onto Gumball's general face area. 

"Mmm, you make such a good fart cushion, big brother..."

*PLRRRRRRRRRRRT!*

"Aaah..."

*plrrt, pfft, pbb!*

"Mmm..."

Anais pushed out the last, smelliest bits of gas she saved up just for him. After almost 15 minutes of continuous farting, she felt a tinge of satisfaction when she got off of her brother, taking care to not let any gas escape, and tucking him in to let him breathe a fresh supply of hot, stinky farts that would last the whole night. She hopped off her big brother's bed, leaving the room and heading back to her own bed, rubbing herself just to the thought of ripping more farts on him. 

Mmmph... Nighty night, Gumball. Hope you enjoy my special brand of perfume while you sleep...