I started messing my pants before puberty and before sexual feelings. I just enjoyed the warm feelings. I used old underpants, towels, rags, and other cloth items rather than diapers. Then I discovered masturbation and also discovered that messing my pants gave me an erection. It took no time at all to combine the two activities. I was doing this only when I was alone until the day I was caught by my best friend Roger. I had the house to myself so I planned for a poop and pee session. I used an old towel that day, pinned in place like a real diaper. I left it a little low in front so I could play with myself during my fun. I had to go poop pretty bad so I knew this was going to be a good time. I arranged a kitchen chair over the dining room linoleum so any pee that dripped out of the diaper could be easily cleaned up. I then walked around the house becoming more aroused by the minute. The walking also increased the need for me to poop. I had peed in the toilet earlier so as not to make to big of a wet mess in the house. Soon the urge to poop became very strong. It was all I could do to hold it. I relaxed just a little bit and felt some poop start to come out. I then squeezed myself shut to stop it. I did that three or four times. I could feel a small deposit between my cheeks, and by now I couldn't hold back anymore. As it oozed out of me I just relaxed completely. I filled the makeshift diaper to capacity in seconds. I stood there for a little while forcing out any remaining poop. Then I reached behind me and felt the big load I had deposited in my diaper. I pushed it against my ass. I sat down on the chair and enjoyed the way it squished into my crotch and all over my butt. It felt nice and warm and gooey like it always does. As I sat there in my poop I took out my hard cock and started to stroke it. That is how I was sitting when Roger just walked in without knocking. I was facing the door so there was no way to avoid having him see what I was doing. But he didn’t know about the messy diaper until he approached closer. He sat in another chair as I just sat there frozen, my cock still in my hand, although softer now. He asked if I liked doing that. I said liked what? He said jerking off. Then he told me that he learned how to do that a few months ago but didn't want to tell anyone. I told him to do it now with me. He stood and dropped his pants and underwear. He pulled the chair over in front of mine and sat back down with his hand stroking his growing cock. He then asked my if I had pooped my pants. I told him that I had. He asked why and I told him that it felt good. He said he would like to try it sometime. I saw my chance to keep us even and not be so embarrassed so I got up and found a towel and pins for him. He took off his pants and shorts and I helped him get his diaper on. He stood there for a little while with his diaper and then I saw a wet spot spread from his crotch. He was peeing in it. So far so good. He smiled and then filled his pants. He pooped a lot just like I had. He asked me what he should do and I told him to just sit down in it. He did and said it felt pretty neat. We then sat there facing each other and began playing with our cocks again. Roger shot first and when he did the cum shot over and landed on my legs. He laughed at that. So when I came I aimed at him and got my juice on his legs. We both laughed then. When things started to cool off I told him to get in the shower and wash himself up. I waited in there and took the messy diaper from him when he removed it in the shower. When he finished I got in and took off my diaper. He took it from me and waited while I cleaned up. We then got dressed and cleaned up the chairs and floor and took the used diapers outside. We buried them in the field near my house so they would never be found. After I discovered the enjoyment of messing my pants and then discovering the enjoyment of masterbation and discovering that my best friend also enjoyed pooping in his pants, things got really fun. Roger and I would get together at his house or mine, and, using old towels, rags, or a couple pair of old underwear we would diaper ourselves and fill our pants. We discovered that if you didn't have to go, if you would gently pound at your ass with the protruding thumb of a fist, you could induce the pressure of pooping. Usually though, we didn't have a problem. We never touched each other during these sessions. (That was to bad, looking back on it now) But we would watch each other mess our pants and then sit together and masturbate. It never dawned on us to masturbate each other. When the warm, gooey, feeling went away, we would take off our homemade diapers and clean up. Then we would dispose of the poopy rags out in the fields surounding our houses. One winter we had buried many poopy diapers in the snow and when spring melted the snow, there they all were. We had to take shovels and bury them before someone found out what they were. We were pretty amazed at how many had accumulated over winter. We had been busy teens. One afternoon, we had just finished our session and were cleaned and getting dressed in the living room. Roger dressed first and went into the kitchen. Suddenly he said "oh hi Mom". I thought he was kidding and was going to go into the kitchen to laugh at him with my pants still down but something told me not to. I continued to pull up my pants and as I was zipping them up in walked his Mom. She saw me pulling up my zipper but other then that we were all proper. She called my Mom and told her we had been up to some sort of mischief. She probably thought we were jacking off together. Well we were. If she had any clue about the messing our pants she would have gone balistic. We used my house for a while after that close call. We did our thing down at the lake in the summer. We would poop our swimming suits and sit it them and walk in them and then wash them out in the lake. (not politicaly correct, I know) We had fun with it until I went off to the service. When I got home we still hung around together but never mentioned or did our messing together again. I wonder if he still does it? I haven't seen him in years. I still enjoy it.