When I was about 12 years old, I was in karate class and would always get dressed in the locker room. There was an assistant who was banned from the place because he used to "help" kids change into their uniforms. I had two separate encounters with this person. The first time I came in early there was nobody around and I was in the locker room alone changing. The assistant came in the locker room and we were discussing different techniques when he asked me if I needed help putting on my belt. I agreed since it was normal for others to help with belts. He told me he would have to tuck my top in better so he asked me to put me pants down and he helped in making sure my top would stay inside my pants by pressing on the back then front while putting my pants back up. While doing this he rubbed against my ass and then against my penis with his hand. He did this a few times and I already knew he was going the extra mile. This wasn't the first time I had been touched by another person so I knew something was up and I was actually a bit aroused. We heard somebody coming so he continued putting on my belt as if just helping me to that. the second time happened a few days later. Again I was early and about to change when he was walked in. This time he watched as I took my clothes off and started putting on my uniform when he asked if I needed assistance. I nodded and he came over this time started by adjusting my pants but grabbing my boxers at the same time. He pulled them out enough to be able to see my penis. He then asked me if I had been going to the doctors on a regular basis to make sure I was developing correctly. I said yes and then he asked if the doctor had ever touched my penis or asked me to cough while holding my balls. I again said yes and he asked me if he could try it to make sure I was good. At this point I was starting to get aroused and I agreed. He locked the door and came back this time kneeling in front of me. He took my pants and boxers off and held my penis with his fingers. I could see it in his eyes that he was horny. He pulled my foreskin back and "inspected". He then grabbed my balls and asked me to cough. I knew he just wanted to touch me and I let him. This wasn't the first experience with another man touching me and I liked it. The session was cut short by a person wanting to come in the locker room. It was locked so luckily they did not see anything. I changed and went about my routine. He was gone because apparently tried doing the same to another boy who told on him. My confession is that I wish he would have done more. I wanted him to jerk me off or put my dick in his mouth. I wanted him to grab my ass while sucking me and cum all over him. How I wish I could go back in time and tell him what I wanted him to do to me. I've never been touched by another man since and I am very curious about touching another penis. I just don't know how to do it because I have a girlfriend and a daughter now but get so horny thinking about this encounter.