This is a true story.
There were four of us boys who were the oldest boys at an orphanage of over 50 boys. We were 13 and 14.
One day the other three boys asked me to come with them, and we went to a deserted shed on the property. Inside were two benches facing each other about two feet apart. They said they were going to do something and I could watch this first time, but after that I would have to join them or else stay away.
One of the guys had a gallon can with some water in it, and he set it on the floor between the benches. Two of the boys sat on one bench and the other boy and I sat on the other bench facing the two of them. The three of them lowered their pants and underwear and sat again. I didn't understand what was going to happen. They each reached into the gallon of water, wet their hands and then wet their dicks. One of the boys had brought a bar of soap and he passed it around and each one rubbed the soap on his dick. They started stroking their dicks and I noticed that their dicks were getting longer and stiffer. Once in while each one had to add more soap or water to his dick while they stroked it.
Each one did this for a while, started breathing harder and then I noticed that one was shooting white stuff out of his dick. A little while later each of the others shot the white stuff out and then seemed to relax. They used the remaining water to wash their dicks, pulled up their pants and then went out to join the rest of the boys on the playground.
A few days later they asked me if I wanted to join them at the shed and I said yes. I had never jacked off before and didn't quite know what to expect. This time I lowered my pants and my underwear with them. I noticed that three of us had dicks about the same length, but one guy's was a little shorter. We all did the water and soap thing and I understood why you had to add more soap or water from time to time. It was because sometimes your dick had too much soap and not enough water and was not slippery enough.
I joined in with the other three and began to really enjoy jacking off. Gosh it felt good! The other three shot their cum before I did, but they waited for me. I told them that I thought that I would have to pee, but they said to just keep stroking my dick. I did and was soon rewarded with some squirting cum and the best feeling I had ever experienced up to that time. We washed our dicks and went out on the playground.
We did this a few more times together, but I stopped going with them because I now knew how to do it by myself.
That was a long time ago, but I still remember it fondly. Once in a while when I'm in the shower, I get the soap and rub my dick, jack off and celebrate that first event again. It still feels good.