I slammed the door behind me after another long day, but the apartment already smelled different. My sister Rachel was home from college, and the place reeked of her. Not perfume or soap. Just her raw, earthy scent. She was twenty-two, I was twenty-five, and we had been crashing together since our parents moved away. We told ourselves it was temporary. We both knew it was turning into something else.
Rachel sat on the couch in nothing but an old t-shirt and panties. Her legs were spread, and she grinned when she saw me. "Took you long enough, big brother. I saved something special for you."
I dropped my keys and walked straight over. "What the fuck did you eat this time?"
She laughed, low and dirty.
"Beans, broccoli, everything that makes my ass blow. Been holding it all day. Want it?"
I did. We had crossed the line months ago, the first time she let one rip while I was eating her out. Since then we stopped pretending we were normal siblings. She stood up, turned around, and bent over the arm of the couch. Her panties stretched tight across her round ass. I yanked them down and buried my face between her cheeks without another word.
The first fart hit me hot and loud, right against my tongue. It stank of sulfur and her insides, thick and wet. I groaned and licked harder, tasting the gas on her skin. Rachel pushed back, grinding her hole on my mouth.
"Fuck yes, sniff it," she growled. "Smell your little sister's nasty farts while you eat my ass."
I shoved my tongue inside her. She let another one go, longer this time, bubbling out around my tongue. The smell filled my lungs and made my cock throb so hard it hurt. I stood up, spit on my hand, and rubbed it over my dick. Then I lined up and shoved into her pussy in one rough thrust.
Rachel moaned and pushed back. "Deeper, you sick fuck. Fuck me while I fart on your balls."
She let them rip with every thrust. Short, sharp ones that vibrated against my shaft and sack. The room filled with the sound and smell of her gas. I grabbed her hips and pounded harder, the wet slap of skin mixing with the wet sounds of her farts. Every time she pushed one out her pussy clenched tighter around me.
I pulled out and dropped to my knees again, spreading her cheeks wide. "Give me more."
She did. A long, rolling fart that lasted five seconds, hot and thick. I licked her hole clean between blasts, then stood and slammed back into her cunt. We moved like animals. She reached back and spread herself, giving me a clear view of her winking asshole every time she let another one go.
"Want it in your face while you cum?" she asked.
I pulled out and she spun around, dropping to her knees. She took my cock in her mouth for a few sloppy sucks, then turned again and bent over. I jacked off fast while she pushed out one last huge fart right against my balls. The smell and the sound pushed me over. I shot thick ropes across her ass and lower back, some of it landing right on her hole as she kept farting through it.
We stayed like that for a minute, breathing hard. The whole apartment stank of sex and her gas. Rachel looked over her shoulder and smirked.
"Round two after dinner? I bought more broccoli."
I nodded, already getting hard again. We never talked about stopping. We just kept feeding the filthy habit, two adults who knew exactly what they wanted from each other and didn't give a damn what anyone else would think.
