You must think it strange of me to ask you here to my bedroom when you are my step-sister's boyfriend. The truth of the matter is that she told me she is going to break up with you soon if your sex life doesn't improve. I like you both as a couple and don't want you to break up so I am taking matters in my own hands so to speak. I am going to show you what you can do to please my step-sister and you aren't going to say a word of this to her or anyone. Think of it as sharing is caring. This is only going to happen once so pay attention.