I am staying with you and my sister for a few weeks. I have never understood what you see in my sister. You are so much better looking than she is. Wouldn't you rather be with the hot 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 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