Well, she does have a backdoor which needs to be deflowered

From Create Your Own Story

As things are, Miranda is on her way to become the teams fucktoy for the day and your sexy little slut for the next few years anyway, so why not break her in directly? You force your way through the crowd of guys waiting to get their share of teenage pussy and step up to the bed. "There's room for two. Move over."

The beefy guy by now fucking Miranda grins at you and switches position, manhandling her easily and again you are reminded how small and fragile she appears compared to you guys, especially someone big as thig guy. He lays down on the bed, your little sister sitting on his lap with his dick deeply embedded in her tiny cunt, moaning and grunting as she is forced to ride him.

No use to have an attack of consciousness now, the chance for that is long gone. Gripping her hips you hold her still, the big teammate of yours getting the hint and pausing in his fucking. You position your throbbing cock at Miranda's tiny backhole, poking against her asscheeks. "Don't worry sweety, this will only hurt a little... and after that, you're extra special", you tell your little sister, reassuring her, at least trying to.

You don't know if she believes you or not, if she had even really heard you, but you waste not another second and begin to force your dick into her asshole. God, she's extremely tight!

"Ooooooo!!", she screams as you push into her secret hole and then begin to get into a rhythm. After just two or three pushes the guy in her pussy get's back at fucking her other hole too, moving in concert with you and forcing Miranda to move her body together with you two.

Not only are you fucking a cute, tiny girl who is way jailbait, she is also your sister, you are doing it in front of a crowd of horny guys and you are also brutally ramming her tiny, tight ass. This is exciting you on so many levels that it is a wonder you are not cumming immediately inside of her.

"Don't forget us girly!" Some guys kneel next to her, making her suck their dicks in turns, ordering her to massage them with her hands and beginning to throatfuck her mouth. This is like right out of a hardcore gang-bang movie, only that she is your cute, formerly innocent sister. It would be horrible, if she wouldn't be moaning in pleasure and pain both. Damn, your sister, is a horny, fucking slut.

Who would have thought?