I had one experience with my sister Wendy. I was 13 at the time, and she was 15. It was a weekend day during the winter, and my parents had gone to one of my brother's hockey games. My sister's friend Nancy had come over, and the two of them disappeared while I was playing video games. I found them in our attic, which had been fixed up as a den. Nancy had brought over an x-rated video tape, and they were watching it on the TV and vcr in the attic/den. I walked in and busted them, and told them I wante d to watch it too. I was thrilled by the tape. We challenged each other to show our privates, and so I took out my hard cock. They dropped their jeans. They felt my penis, and I dared them to suck me. Both girls refused at first, but then Nancy decided to do it. My sister watched her, and then she decided to try it too. It was very exciting. I felt Wendy's pussy, and got them to show me their breasts. Nancy encouraged me to lick my sister, so I did. When I stopped, Nancy tried it. We took turns licking her until she came. I was incredibly horney. I wanted to fuck one of them, but they both refused. I asked Wendy to lick Nancy, but she wouldn't. I ended up masturbating and cumming all over the floor while I felt Nancy's pussy. Wendy was very embarrassed about it afterwards. She swore to me that she had never had sex with a girl before, and made me promise never to tell anybody. We never touched each other after that day, but it has been a source of my fantasies ever since. 10 years now). And I wouldn't change what happened for the world.