I know I shouldn't have. But I just couldn't help myself.

My little sister was just so fucking sexy and slutty. My mom got her a little silk nightgown, could you believe it? She looked so whorish and rapable.

I was helping her get ready for bed and staring at her flat but puffy little girl chest as I put on her nightgown for her was too much. I crushed up some diphenhydramine into her water and pet her until she was well and truly asleep. When she didn't rouse from me shaking her roughly I lifted up her nightgown and got to work.

Her asshole was tiny and tight, obviously virgin. Of course it was. She was six. She was asleep on her belly, her tail limp to the side, the slut. Her ass was begging for it. Beneath her tiny girl hole was her cute little balls and stubby baby cock. Fuckkkk I couldn't help myself. I pressed my mouth to her ass and snaked my tongue into her. She was a bit dirty, but I didn't care. I think it honestly made it hotter.

I grabbed both her cheeks with my paws and spread her wider, licking deeper into her. She began to whine in her sleep, her little face scrunching up in pleasure from me tongueraping her ass. I yank my tongue from her and she moans, her little girl ass gaping and sloppy wet.

"You're such a cute rapeslut. Horny for your big bro's dick, aren't you?"

Obviously she didn't respond. I reached into my pants, palming my cock. I was so fucking hard. I pulled my dick out and rubbed it against her spit wet hole. My fat flare slid around her ass, smearing my spit all over her scales. I pressed myself against her virgin ass, moaning as I felt her guts try to suck me in.

"Fuckkkkk you're such a whore, sis. I bet you can't wait for me to rape your asscunt."

I began to push into her, afraid for a moment that I'd slip off her sooner than penetrate her, but with a sloppy slurp, my cock slides four inches into her. My slutty little baby sister *moans* in her sleep, like this fucking ball-droppingly whorish moan. I immediately pumped a fat wad of pre into her, the feeling of her just deflowered ass suckling around me making tears spring to my eyes in pleasure. She felt so good! I had to rape this hole until it broke.

I grip her sides, my hips grinding down, forcing her ass open for my foot-long horse cock. Fuck, watching my dick that was almost as big as her torso into her ass made me so horny. It was a miracle I didn't blow my load when I bottomed out in her. I must have been crushing her prostate because when I checked underneath her, her little clit was leaking like a faucet. My pre had long since lubed up her ass, her hole now slick  enough for me to glide easily in and out of her. And fucking hell I did.

"I hope you liked not wearing diapers, sis. Your ass is never gonna close again after I'm done with you," I said, and then I began to rape her ass.

She was insanely hot. I couldn't help but hump myself as fast as possible into her sluthole, my cock sliding in and out of her. She kept farting, my precum splattering back onto my crotch and it was disgustingly hot. Her ass was practically blowing my dick, clenching down and fucking *sucking* my cock deeper, I swear. It's like she was made for it.

My little sister keeps gasping, my cock so big it forces air in and out of her lungs. Knowing that me fucking her is literally keeping her alive right now is enough to make me cum, a week's worth of cum filling up her guts. I push all the way into her, her lungs emptying as I pump her stomach full from the other side. It doesn't take long for her to start twitching, her body desperate to get oxygen in. I tug back out just a bit and she pants, sucking in air as best she can before I slip back in.

Fuck, the way her ass clenched on me as I suffocated her. If I thought she was blowing me with her ass before I don't even know what to call what her buttcunt did as she struggled. It's like her butthole was gasping for breath too, clamping hard around my cock. I kept slipping in and out, giving her a long break after that first round. Eventually I stopped cumming, my dick still painfully hard and sensitive.

I lifted her up, sitting her on my dick in a perverted version of when she'd sit in my lap. My huge cock bulged her belly, barely visible with how plump she'd become with my cum bloating her. I molest her soft nipples and she moans as i thumb the puffy skin.

I keep bullying her nipples until she's moaning each touch and my dick no longer feels like it'll explode just from knowing I was in her ass, then move my hands back to her hips. I slam her up and down my dick, using her as a fleshlight. She's so fucking hot, moaning on my cock still like she wasn't choking from it, her tail wagging in her sleep. I keep raping her ass, and then my little sister moans, slick wetness bursting from her ass. Her cocklet spurts too, barely anything in comparison from the flood of butt cum from her ass.

"Fuck sis, you really came from me raping your asshole? No way I'll ever call you anything other than buttslut from now on!"

It doesn't take me long to cum again, my dick still sensitive even with my break. I don't suffocate her this time, knowing her slutty little body couldn't handle doing that again. Not yet. In the future I wanted to see if I could make her cum just from asphyxia, but that's something for later. Her belly bulges out even more as I dump a second load of cum into her. My limbs twitch as I keep pounding her as I cum, mindless pleasure overtaking me.

When I stop a second time I waddle to the bathroom with her, knowing how much of a mess uncorking her will be. I step into the bathtub and begin to pull her from my dick, her hole pulsing and trying to hang onto me desperately. God I wanted to pump her full a third time, but I knew I would oversleep for school if I did. She finally pops off of my dick with a nasty squelch and then my cum begins to pour from her ass.

She moans limply as I hold her up, her big brother's cum gushing out of her. I'm pretty sure I see her clit squirt again, but with all the cum flowing from her butt, it's too wet to really tell. Finally she's empty and i wash her off quickly, her gaping ass receiving warm enemas until it's clean. I spread her ass. She's still loose, all fucked open. Looking into that gaping kid hole I can't help but shove my long tongue back into her, licking deep inside her ass. She tastes so good.

Once I've had my fill, I dry her off and put her back into her nightgown and panties. Imagining her waking up to her now gaping sluthole leaves my mouth watering, and the idea of fucking it night after night made my soft cock twitch.

"See you tomorrow, sis," I say, and slip out of her room.