You tell your sister she's looking a bit too slutty to go out. She rolls her eyes and says it's for a guy anyway, that it has nothing to do with you. But you insist she's gone too far. She is annoyed and strips out angrily saying "is this good then?!" and you get hard seeing her nude body.

You decide she's ready to do all sorts of things probably, if you approach it the right way. You ask if she's going to lose her virginity to him and she... sort of admits it, yes. You tell her she won't be ready, that she'll be bad at it. And she really doesn't want to be!

So you help her out.