An exhibition is nothing without a voyeur

Almost every weekend I stay at my best friends' house, because we have to go to football matches over the whole weekend. He has his room in the top of the house, his sister one floor down. I discovered, I could peek in her room from the second landing, looking down through a small window above the door to her room. One night, just before I went to bed, I saw her lying naked on her bed, obviously masturbating herself. I felt my cock grow hard, do I started jerking myself off in the same rhythm that she used to penetrate herself with that dildo. At the moment that she orgasmed, she looked me straight in the eye, so she knew I was watching her! I spilled my sperm on the carpet on the landing, the stains are unremovable! Next time I will ask her to let me in...