This all started when I was in my teens. I come from a family that lets you do practically anything you want so I grew up fast and learned what sex was at a very young age. I am now 18 and am almost done with school. My uncle Don (name changed) is now 22 almost 23. He was 19 when it first started.
Me, my uncle, and my cousin were all playing some monster game downstairs because we had just watched a very action packed horror movie. Don was supposed to be saving me by keeping me off the ground. We were sitting in the chair while my cousin pretended to a be a monster on the floor. I was sitting on Don's lap squirming around looking for where my cousin would pop up next when I noticed the hard-on pressed against my ass. I think he noticed that I noticed because when I turned around to peek at him he was smiled a knowing smile. I was a little scared at first but then I just surmised that it was a normal reaction when I guy had a girl sitting on his lap squirming around.
Just then my cousin's mom called downstairs to tell him they had to leave so it was just me and my uncle. I didn't know what to do. I knew I was attracted to him and had masturbated about him many times but I knew we could never do anything about it (or so I thought). I got down from his lap and went to turn on the TV and knew he was looking at me. I was so nervous that I forgot what I had gotten up for and had to turn around and ask him if he knew why I had gotten up. He gave me another knowing look. He told me to leave the TV of and come sit down because he had something to tell me. He asked me if I had felt his cock agienst my ass and I said yes. He told me that I had nothing to worry about and that I could turn the TV on.