Be mine while my sister is away on a business trip! Karen has a secret about her sister's boyfriend and goes wild! He refrains from masturbating and having sex, and while my sister is away, they have sex many times and enjoy themselves together! They lift the ban on abstinence and become obsessed with sex, devouring each other like crazy! This is definitely the best work in the series! He's having an affair with his girlfriend's sister! It's not an affair, it's serious...! They have sex countless times over the course of a few days! There's no going back!