One summer I was visiting my aunt in another state. She had a son who was 15. When this happened I was 13. They were very open about seeing each other naked. They walk around the house naked all of the time. At first I thought it was strange, but then I started to do the same thing.
One night my cousin said that he was going to take a bath. My aunt told me if I didn't have anything better to do I should go in with him. I said, 'OK.' The bathtub was large, so we were sitting facing each other. We were talking and cleaning ourselves. Since we didn't care about being seen by my aunt, we left the door open. She then came in to get some things and to see if we were all right. When she left, then we started to wash our cocks.
My cousin asked if I knew how to masturbate. I said no. So then he said, 'Let me show you how.' He started to masturbate, and then I started to do what he was doing. I came on him about one minute later. Then he came on me. We did it every day after that.