FROM ABSTINENT TO PERVERT - Oh no! Sister Tina, your strictly abstinent neighbor has masturbated. She always wanted to wait but was just too horny. Now she's knocking on your door crying to be comforted by you.

SPOILER: The idea in this scenario is that Tina is an incredibly slutty whore, but doesn't want to admit it to herself because she was brought up very conservatively and was always told by her teacher that people who masturbate get shrinking boobs. Your job is to awaken the slut in her by taking away her fear of sex.