I found my hot big step-sister trying on step-moms sexy nighties. It looks like she is getting ready for her boyfriend to come over. If only her boyfriend knew what a cheating slut my step-sister really is. Damn, she is hot, look at her big fat ass hanging out of that satin nightie. She looks way better in it than step-mom. I watch her for a few minutes until she notices me. She begins to be a total bitch to me as usual, only today, I have the upper hand. I secretly recorded her cheating on her boyfriend and if she does not do what I say I will send it to him. You will do anything for me?? You will do anything for me to delete them. Show me your tits. Let me touch them. I go in to kiss her and she pulls away, she is such a bitch, but I have been wanting to fuck my step-sister my whole life and now is my chance. I throw her back and bend her over and fuck her. I completely humiliated her and made her call me the best step-brother. Just when I am about to cum, I shove it in her mouth and make her swallow it. Am I going to delete the pictures?? No, I think I will hold on to them!