Friday release: Innocence lost
Well, a (evilishly pervert, of course

:-D) suggestion then comes kind of spontaneously, which can cover even two different scenes.
While they are there, mom and dad join in, including enjoying Rori (if I remember correctly, you had already put something where it was suggested dad may not shy away from "interacting" with her, and there was some scene were clearly the mother and Rori were doing stuff in parallel).
But then, after the friends have left, would stay the fact she was not supposed to have friends around to do that stuff, so she misbehaved and should be punished - what that means and if there is a sexual content to it, left to you, of course.