デートの前に、私は義理の妹にセックスの仕方を教えます...

Definitely my pretty step-sister has a lover friend who is clearly not rich, because today the girl comes to me and asks for condoms. But, judging by the conversation, she does not know at all what to do with the male genital organ. And even though I have never been a teacher, I willingly teach my step-sister what to do in order to have fun together.