This happened last weekend.
I'm a doctor and I work at a clinic. Two weeks ago while I was at a Doctors encounter, I met a guy named Alvaro. He is at the university, he's starting his career. We talked all the afternoon that day and he asked me if he could go with me when I have to work, just to get a little medical training and I agreed, so I promised him that I'll call him.
Last Sunday I was on my turn at the clinic, and called him, so he went there and helped me to attend to some patients. That afternoon, it started to rain a lot, so I had nothing to do and we went to the bedroom and started to talk the whole afternoon with the nurse who was on her turn that day. When she went to her bedroom, Alvaro and me started to talk about sex and medical problems related to sex. When I told him that I am circumsized, He said that he had never seen a circumsized dick and he actually did'nt know if he was uncircumcised or not. So I told him, show me your penis and I'll tell you if you are or not (I swear I was considering the situation from my point of view as doctor). When Alvaro got his penis out of his pants I noted he was erect, a big penis by the way, with a lot of hair surrounding it. I just stared at it and he started to move his hand up and down his manhood and I saw his foreskin pulling forward and backward as his hand moved it. I just said 'you are an uncircumcised man, but why are you erect?' and he replied that our conversation had turned him on. He said he wanted to see my penis, and at that point I was erect also, it was a really exciting experience. So I get my dick out of my pants and he saw it with a lot of curiosity. We pulled up our pants again and started to speak with more freedom. I asked him if he had had any sexual experience with a man and he said no. He said he was not gay but he would be able to have such an experience with a man if that man was someone like me. 'What do you mean by that?' I asked and he said that he knew I could keep a secret if that happened between us. 'and what are you able to do?' I asked, and he said 'just masturbating each other and watching you jerking yourself'.
I was so horny at that point and my dick was trying to break out of my pants. I slowly went to his bed and grabbed his dick in my hand. It was hard. We both pulled our cocks out and started masturbating each other, it was great touching his cock as his foreskin moved back and forward and touching his hairy pubes that had my mind wild. I couldn't contain myself then and went to his cock and took it in my hand and started to jack it. Wow, it was such a great experience, it was a very big hard cock. After jacking him for a while I asked him to do the same to me and started to give me a great handjob. After a while he came all over my hand. I came immediately and spilt my semen on his chest. We started to laugh and agreed that it was an experience that would be worth happening again.