It was a hot July day when I was 16. My girl cousin who I hadn't seen for three years was visiting along with her mother. While her mom and my mom visited, my cousin and I decided to go down to the old swimming hole.
We changed to our swimming suits. As this was family, I didn't see any good reason for putting on my jock strap. She knew I had a dick. All the time we were growing up we bathed together. The last time I was 13, and she was 11.
After changing I noticed that she was developing very nicely. We went to the pond and lay next to each other in the cool grass. Then she asked if I masturbated, and in the same breath said that she had seen her dad doing it many times, and that she thought that it was cool watching him. I said that I did masturbate; all guys do. Her gaze was on the front of my bathing suite where she was watching my dick harden.
She had seen my dick hard before, but that was three years ago and it had gotten bigger. She reached over and started rubbing the buldge. Then she asked if she could watch me masturbate. I had to give in and let her watch. It was fun.
Later that evening, we bathed together again with our moms watching to make sure that we didn't do anything we shouldn't. I got out of the tub with an erection as my cousin washed my dick, and I washed her boobs and her pussy. Mom remarked that I was probably pretty horny and suggested I milk my lizard. I did with all watching.