Then she does something unexpected. She sits gently on your crotch and grinds herself on it. She's far too good at it to ignore - probably all that practice she got atop your face - and you quickly have her naked on her bed. She lays on her back letting you appreciate all her curves and her large tits. She's still shy of your gaze as it explores but she doesn't dare cover up - only goofily trying to show off her parts with shaking and pinches.
You turn her around so she lays on her stomach and move down to her beautiful butt. You spread it's round cheeks with excited fingers. Finally getting a good look at her entire body in the daylight you can't help but realize something.
Her asshole's perfect.
A small pink thing tucked away and very shy of any attention - you choose your target. You can't imagine how tight it must be. You ask if she's ever played with it before and she shakes her head 'no' confused. She didn't even know you *could* play with your asshole. That just makes her day of ruination all the better and all the hotter.
"That's dirty brother you mustn't!" Even as she complains you feel her relax and push out on your tongue - coaxing it deeper into her girly asshole. She giggles between anxious exclamations as she gets her ass eaten. She didn't realize this was what that meant - but if the way you nibble, suck and lap at her rim is any indication then she'd say the description was apt. Your thumbs pressed into her and spread her - trying to loosen the impossibly small orifice to something you could work with. Your cock was much larger than average and you wanted to brutally fuck her here everyday for a week.
You withdrew and watched your work reveal itself under your gaze. She tried to clench herself shut but her muscles were too relaxed. Perfect.
You ask her to spit in your hand and rub it on your cock as you bring it from your shorts. She gets the message and spits in her own hand then jerks you off gently. She wants to see your copious precum - she's sure that'll be enough lube. Little does she know that being fucked wasn't something you could 'handle' as much as it was something that made you bite your pillow, cross your eyes and try hold onto your sanity.
"Still think I'm a pervert?" You mock over her as you finger her entrance. She shakes her head. "You don't think I am? Isn't fucking your sister's ass 'dirty' too? Tell me what you'd have done if you knew this is what I wanted a week ago."
A bit of a stuttering mess, she explains she'd probably snitch to your parents after recording your extreme confession for her friends to laugh at together. You ask if that was something they still did and she bowed her head shamefully. She admitted they all had a small crush on the 'hot brother' and tried to get your attention that way. She thought it was funny feeling anything for but hate but really that was just how she compensated.
Her hands come to her butt and spread it trying to open her hole more - it feels incredible for her already.
You wonder if you'd ever let her experience it in her other pink and puffy entrance. If she was already exposing herself for you and grinding back on your fingers - did a cute buttslut like her even *deserve* to be fucked vaginally?
You slap her butt harshly making her whimper. You love the sounds she makes now that the two of you are home alone and in private. She's clearly embarrassed of them but doesn't dare disobey and hide them.
