My cousin and I were buddies growing up and still are. He and I used to spend the night at each others house all the time, especially in the summer when we were not in school.
I discovered masturbation pretty early on, so by the time I was 13 I thought myself to be fairly experienced. But, I had never done it with another person.
One typical summer weekend my cousin who was 14 at the time was staying the night at my house. We used to stay up all night playing video games and talking about school and girls.
When we finally shut off the Xbox around 3am we found some porn on TV. My first thought was to change it because I didn't think it would OK to watch it with him, but he wanted to watch and didn't seem to think it would be weird so I left it.
After a few minutes I began to get really horny. I was thinking of going to the bathroom to take care of my now throbbing cock, but I was somewhat turned on by the thought of watching this with him.
I began to notice the bulge in his gym shorts and found myself wondering what his dick looked like. a couple more minutes passed and he says to me 'I'm really horny. How bout you?' I motioned to my hard on through my shorts and we started talking about dick size.
I suggested that we take them out and compare. Surprisingly he agreed and before I knew it we were sitting next to each other on my bed with our dicks out. We were both cut and about 5.5' long being at the start of puberty but his dick was thicker than mine.
I commented on how his dick was thicker and without thinking twice I asked if I could touch it. He said I could, so I reached over and wrapped my hand around his rock hard cock. It felt so warm and smooth. I began to stroke him and his hip motions and moans let me know to continue what I was doing. After about 5 minute of steady stroking I felt his dick swell up, he shot 4 ropes all over his chest and down on my hand.
I used his cum as lube and started stroking myself. He sat up and took my cock saying 'you want me to do you?' ah yeahhh! I came very quickly and covered myself with hot cum. We jerked together until we were 16 and became sexually active with girls. During those few summers I could not wait for us to arrange sleepovers.