This is about my first experience with a penis.
When I was in my mid teens, I had this girlfriend named Patty. We'd often spend the night at each other's house on weekends. Early on, I spent the night at Patty's. I woke up fairly early the next morning (a Saturday). Patty's parents were both off to work. Patty had a younger brother named Jimmy. Patty had told me about Jimmy's problem of often going around the house with his hand on his penis through his clothes. Anyway, in walked Jimmy into the kitchen with me. And, sure enough, just as Patty had said, he had his hand down on his penis squeezing on it. And, it was very obvious, Jimmy wanted me to see what he was doing. He was wearing pajamas and it was plain to see that Jimmy's penis was erect.
It was a month or so later that I spent the night and as usual woke up first. I went to the kitchen and got a roll and then to the living room. Sure enough, in walked Jimmy. And, again, he was playing with his penis through his pajamas. He sat in the chair next to me and a minute later he ask 'Want to see it'? I could tell he was dying to show it to me. At 15 years of age and having never seen a big boy's penis, I was naturally curious and I answered 'If you want to show it to me' knowing that he would. Jimmy immediately jumped up and pulled down his pajamas.
Jimmy stood in front of me with his erect penis pointing right at me. He had quite a bit of hair around it. He then asked me 'Want to touch it'? I said 'OK' and he moved closer to me and I reached down taking it in my hand. It felt so hard yet so soft. Jimmy then said 'Do this to it' putting his hand on mine showing me how he wanted me to stroke it. I did and Jimmy said 'Don't stop'. I kept it up and knew enough to know I was jerking him off. Soon, Jimmy held his head back and his eyes closed as he let out a grunt sound and out squirted his sperm. I was surprised at how it shot out like it did. One squirt ended up on my knee and I touched it. This was my first experience with a boy's penis and cum.