While visiting my father, his new wife, and her daughter one day, I thought I was home alone. My father and his wife were at work and my step-sister was at her friendís house. I got one of my fatherís Playboys out of his nightstand and started to pleasure myself. There I was totally exposed, when I heard someone coming down the hall. I quickly jumped up, but it was too late. There was my step-sister and her friend standing at the door looking in at me. I quickly ran into the bathroom. I could hear them giggling through the door. I was naked and didnít have my clothes. They found the playboy and took it and hid it. I waited till they were gone, and then came out to get my clothes. I didnít know what they did with the playboy, but I needed to find it to put it back in my dadís nightstand. They had left, so I searched the house and finally found it in the laundry room. I put it away. Later that afternoon, imagine my embarrassment when my step-sister came home. My dad and his wife were still not home. She came in with a big smile on her face and I must have looked nervous as could be. She asked, "Did you have fun today?Ē still smiling. I didnít know what to say. Then she told me she was going to tell unless I let her watch me do myself again. I was shocked, but she was serious she said, ďEither you let me watch you right now or I'm telling when my mom gets home." I didnít know what to do, but she said, "Letís go in the bedroom." I followed her in to her room where she locked the door and told me to strip. I didn't have a choice, so I took off my shirt and undid my pants. She told me to take them off completely, which I did. I was very nervous and not excited at all. She told me to do it. I tried to get things going. She asked me what the matter was, then reached out and touched me. I was starting to feel some excitement, so she sat back and watched as I kept working at it. She then starting rubbing herself through her clothing. She said I was turning her on and asked, "Do you want to see me?" I nodded yes, starting to breathe hard. She said, ďYou can look, but no touching.Ē Then she asked if I wanted to smell her. I said yes. She told me to lie down, and then she got very close to me. I couldnít help myself and I began to give her oral sex. After that day, I made love to her every day of the rest of the summer until it was time to go back home.