Mutual wanking with school friends and with my best friend was a regular part of my teens, I just loved to feel their hard cock and bring them off while they did the same for me. But all that was soon left behind in my late teens when we began to date girls seriously. It wasn't until my mid twenties, and then after I was married that I experienced another man's cock again.
It happened when I went on a football(soccer) tournament to Guernsey in the Channel Islands between France and the UK. Our club was based in a small hotel and we had to double up in rooms. I was billeted with William. We all knew he was gay but I had no objection to sharing with him, in fact I found him quite attractive. I did not know that he had a crush on me at the time.
It happened on the first night.
William went for a shower and returned to the room stark naked. His cock was semi-erect and so much bigger than mine even then. He stroked his cock until it was fully hard and apologised by saying he just needed to toss off. Why don't you join me Brian, he said. I couldn't take my eyes away from his cock and knew that I wanted to do something about it.
I excused myself and went to the shower room, my cock was now rising at the thought of what might happen. Stripping off I returned to the bedroom, my stiff cock sticking up.
William smiled and came over, taking my cock in his hand and giving it a light stroke. Nice cock, let's get down to business he said, indicating his bed. We lay down and proceeded to wank each other till we came together.
That night was spent in much mutual play. We never got together when we got home, but we used to stand next to each other in the post-match showers and stroke our soapy cocks together.