When I was 20 years old my best friend's mother dropped off his little brother at my house. His name was Scott and he was 15 years old.It was summer 1983 and I lived on a lake. It was hot that day and Scott's mother dropped him off at my house so that he could go swimming. She asked if I wouldn't mind taking him down to the lake to go swimming. She told Scott to call her when he was ready to go home. I didn't mind as I was bored myself and it was hot. My mother and my sister were on vacation in Las Vegas and I had the whole house to myself for a week. I took Scott down the short walk through the woods in our back yard down to the lake.We both swung off the rope that was in a big tree off the ledge and into the lake. It was very refreshing. We swam and took turns jumping off the rope. After a while I swam out a little farther into the lake and was just relaxing and treading water. After a minute or so Scott followed. As we were treading water he swam right up next to me and squeezed my package and smiled at me. I was totally shocked. Then he looked me in the eyes and kissed me on the lips. I mean HE KISSED ME!My penis started to throb as I kissed him back. But why was he kissing me???I don't remember exactly what happened next but it seemed we both knew where this was going. And we both swam back to shore without saying a word. My penis was still throbbing and needed attention. We dried ourselves off without a word between us and collected our stuff and headed back to the house. When we got back to my house we entered into our playroom. I pulled out the pull out bed we had in our couch. Scotty started taking off his wet clothes revealing his hard penis. He had very little hair on his body and particularly on his genitals. He was totally erect. I ripped off my clothes as fast as I could. Scotty had already jumped into the bed and I immediately followed.We started groping each other, and he reached down and began stroking my penis. But he stopped just before I was ready to cum. I felt disappointed but Scott had another plan. He put his mouth around my penis sucked it once and then laid down on his stomach. Then he instructed me to stick it in. I realized he wanted me to stick into his butt. I had never done this to anyone male or female, ever. I complied and lay on top of him and thrust my penis into his ass. Once I was in I started to push, up, down, up, down, going faster as I did so. He started to moan with pleasure and after about 2 minutes I felt myself cum and it felt so good. I still wondered to myself how a boy this young had so much sexual experience and was so knowledgeable about sex. Next day he told me that he often let his best friend fuck him since he was 10 years old up until he moved to our area. They used to suck each other and jerk off together.Because of the weather, he ended up staying for a few days so we had plenty of time to masturbate together and suck each other until we both came. We continued to do this secretly for the next 4 years even after I got a girlfriend