Your Girlfriend's step-Sister

I stop by to see my step-sister but she isnt home. We chat for a bit and I tell you about all the horrible dates I have been on lately. I proceed to tell you how lucky my step-sister is, having you as her boyfriend. How I wish sometimes you were my boyfriend and not my step-sister's. I get closer to you and tell you how I think about what it would be like to have sex with you. You tell me you have thought the same. I get on my knees and show you everything I have dreamed of doing to you.