I am 100% straight, but this summer was all experimental
My cousin was visiting us for the summer, and it was fun; we would play videogames and watch television. We didn't have a guest room so he slept in my bed. There was a lot of room on my bed.
So the first night before we went to bed there was a problem. I had just remembered that I slept in the nude. So I would have to put on my boxers. So it was time for bed and I took my pants and shirt off and spilt into bed. I tuned the television on while my cousin took his shower. My dad was still awake and he was in the living room, and you have to go through the living room to my room from the bathroom. My cousin did with an exception he did it naked, and he entered my room.
I was shocked he was naked in my doorway then closed the door. Then my dad entered and told us that we could sleep naked in the bed but just wear boxers to my room (my dad knows that I sleep in the nude). So got from under the covers and took my boxers off and went in to bed, and so did my cousin.
The next morning we got up and played video games (my parents go to work early in the morning). We put the covers over us to cover up. I can't remember what we were playing, but there was a girl with big boobs and I got an erection and so did my cousin but I didn't know if he saw mine. Then without a notice he touched my penis and I yelled 'wow'. I looked at him and he looked at me and then I grabbed his. We kept doing this for a while. Then he kissed me for a long time then we lay down on my bed and then he masturbated me and I did it to him.
In the end I came on him and he did it on me. We both cleaned each other up, we did it until he left. Am going to see him in the summer. I wonder how he has grown.