I am 13 but this story happened when I was 11. I guess I always masturbated, mostly with my older brother. We are nudists in my house. It's just my father and my brother and me so most of the time we are naked. Also we go to nude beaches during the summer, so I have seen lots of people nude including women and girls. Lots of times my brother and I sleep together just so we can masturbate each other.
We have been doing it for a very long time, so I don't remember when we started. We both can shoot semen now, but we have been doing it since before neither one of us could.
Anyway my story is about my girl cousin. We are never nude when certain people come over to our house, such as my uncle and aunt and their kids who are three girls, mostly because they are not nudists. So when I was 11, and so was one of my cousins, I was really curious about seeing her nude. I guess she was curious about seeing me nude too, because she always asked me about what it was like being a nudist. I told her I wouldn't mind being nude in front of her, but only if she got nude too.
We went upstairs to my room, and took off our clothes. I was amazed how sexually excited I was since I see nude people all the time, but this was the first time I had seen her since we were very little kids. Besides, at the beach, I never get to see a woman really up close. My cousin let me touch her vagina, and showed me all her parts, and she played with my penis. I put my finger in her which was the first time my finger was ever in a girl and she showed me how to masturbate her. She masturbated me too until I got the feeling. She was getting it too, I could tell. I didnt have any semen yet so nothing came out of me. That night I told my older brother all about it and we masturbated each other until we fell asleep. I never did it with my cousin again, but I think about her all the time. I hope someday when we are all old enough she will become nudist too.