Mary was starting to move up and down on me. She was supporting herself with both hands on my chest and I wished the room wasn't so dark because I would have loved to see her face. I wondered if her expression was disgust or hatred at having to f**k her own little brother to keep herself out of trouble. After a minute or two of sliding up and down my d**k she said, "If you tell anyone about this I swear I'll kill you" and then she rolled off me and said, "You get on top and do some of the work." As I slid into her she muttered, "I can't believe that I'm doing this. I can't believe that I'm letting my snot nosed little brother f**k me." But even as she was saying the words her hands were gripping my ass and pulling me down to her. She pushed her ass up at me and what happens to most guys ge
