(This was originally filmed as a custom video and the name Chris is used throughout) You're walking past your sister's bedroom door when you notice her on her bed, touching herself! She must think she's home alone... You stay quiet and watch, taking out your phone to record as she rubs her pussy and moans, before she sucks a finger and slides it into her asshole! She starts fingering her asshole while she plays with her pussy, and is getting really into it before she suddenly notices you, standing there in the doorway with your phone out! She's incredibly embarrassed and leaps up, trying to cover herself with a blanket and asking you what the hell you were doing recording her. You tell her if she doesn't want everyone to see the video of her fingering her ass, then she'd better fess up and answer your questions! You get her to reluctantly admit that she loves having her fingers in her ass while she masturbates, and she begs you not to tell anyone and to delete the video. You're having fun now so you tell her if she wants it deleted she'll have to do some things for you... First you want her to carry on as she was doing, and let you watch. She's furious but begins touching her pussy and fingering her ass again, and gets so lost in the moment that she pulls her finger out of her ass and sucks on it! You ask her what she was doing, threatening her with the video to make sure she tells the truth, and she confesses that she really enjoys the taste of her own ass. You tell her to stick her finger back in again and then let you taste it, and she complains but lets you do it! She asks if you'll delete the video yet and you say nope, not yet! First she has to do something else for you... She has to let you fuck her in the ass. She says no way, she's not letting her brother fuck her ass - that's digsusting, and besides she's never had a cock in there before! But you remind her what would happen if the video got out and she eventually agrees. To your delight, once you start fucking her tight hole she slowly starts to enjoy it, eventually admitting that she's loving having her ass filled with your cock, and begging to suck her ass off of you! You fuck her ass in mutiple different positions, stopping frequently to make her suck your cock and clean her ass off it, and by the end of it your reluctant sister has turned into a complete anal whore, begging for your cum!