I am staying with you and my step-sister for a few weeks. I have never understood what you see in my step-sister. You are so much better looking than she is. Wouldn't you rather be with the hot step-sister? You knock on my door to ask me something and I tell you to come in even though I'm naked and masturbating on the bed. My step-sister won't be home for a while. Don't you want to play with me? Let's cum together. I want to see how hard I can make your cock. I want you to stroke it for me while I play with my pussy. It's okay. It's not really cheating.