Blackmails sister's slut until she gets fucked

This aunt's brother has discovered something about her that she doesn't want her parents to know, something related to how fucking she is, and she knows that knowing it can blackmail her. He blackmails her on several occasions until he can have sex with her, which has become his biggest wish since she knows how little fox his sister is. The aunt at the end says yes and surrenders, letting him do what he wants with his body. He starts fumbling with her, then spreads her legs and begins to put her on the edge of the bed, fucking her for a while until her semen-filled mouth is full.