My step-sister has always been such a bitch. She embarrassed me in-front of any girl I would bring home. She would also cock block me with any of her friends I tried to fuck. I was at the mall yesterday and saw her kissing some guy that was not her boyfriend. Several photos later, I had the blackmail material needed to get what I wanted. The following day she is laying in bed and I show her the photos. She flips out but I don't care. I tell her to stroke my cock and I might delete the photos. Payback is a bitch little step-sister!