I went camping with my family near Des Moines, Iowa at a very large lake (large for Iowa, that is.) It was so hot that week it was almost not even fun to be camping. It averaged 95-100 degrees with very high humidity. During the first couple days of my stay, I decided to go swimming in the lake. I went into the changing rooms and nobody was there. I almost got stiff thinking about all the dicks that had been bared in this one cooler, damp, and dark room. I swam for about 10 or 15 minutes. I noticed a group of 4-5 boys ranging from about 9 to maybe 14 goofing around on the beach. I finally headed back into the changing room and started to take a shower with my shorts on. There were some showers that were full so nobody could see and 2 communal showers where the bashful dare not go. I took to the single showers. As I was showering I heard talking and figured out it was those boys from the beach coming in. They were laughing and joking around. The got into the communal shower and the conversation turned to dicks, pubic hair, and boners. They must have known I was also in the room because my shower was already running. I had to see them in the shower! So, I got out of my individual shower and to my surprise the two older boys had their dicks out and were sporting some decent hard ons! The others were laughing and giggling. They all looked at me and kinda froze. I said that my shower was not spraying right and asked if I could finish in on one of their empty showers. They didn't say much but agreed to it.
This was a fantasy come true. The two naked boys turned to face the wall, but didn't try to put on their shorts. I said that I remembered being their age, but was never that brave to "whip it out and get hard for your friends." One of the other kids said "Yeah, they got big balls," and I said "I think I saw..." I decided to take a risk. I started taking off my shorts and bared all. I was not even as big looking compared to the hard ons I had just seen. All the boys giggled and kept trying to peek at my dick. One of the older boys said, "he seems cool, lets keep going." It turns out the younger boys didn't believe the older boys could "cum" yet, so they were showing them. I spent probably 45 minutes in that shower that day. The older boys taught the younger ones to jerk off and the older boys came on the floor of the shower. I just sat in the corner with an enormous hard on and waited to beat off when I got back to the camper.