When I was younger, I was staying with a few other guys at a friends' house one night and we started playing truth or dare. Almost every question at the start was something like if you've seen a girl naked, touched a boob, and so on. The biggest one though was if anyone had ever jerked off, which I was the only one that admitted I did. After these questions ended, we went onto the dares. They were normal stuff for people going into puberty, but eventually I was dared to do a big one. I was dared to run out to the street completely naked and come back. I didn't want to, but they kept saying I was dared so I had to.
Eventually they got me to strip down and I inched towards the door. It was night out so I figured it wouldn't be so bad, so I opened the door and ran out. When I got back though, I tried to open the door but found out they had locked it. I banged on the door and went over to look in the big window by the porch and I saw them laughing. I started begging them to open the door, but they started saying since I admitted to jerking off they wanted to see it. I told them there was no way, but they said it was the only way they were opening the door.
By this time my penis was hard as a rock so I went ahead and started stroking. They watched closely while I danced around with my erection in my hand, only lasting a couple of minutes before shooting a small line of cum on the concrete. As soon as I came, I told them to let me in, so they unlocked the door and I ran in, still dripping cum. I was really embarrassed when I got dressed, but I got over it when they started asking me questions about how it felt, which actually made me feel more grown up than the rest of the group. None of them jacked off in front of anyone else that night, but a couple of them went to the bathroom later on to try it out.