At 15, I took up boxing with my bud. We were both light heavyweights. His dad, Bob, was our trainer and masseur.
I had a bad day one day and was working out alone with his dad when he called it quits and he told me he would massage me to loosen me up.
I got on the table naked but for some reason got a bodacious hardon. He made a sexual comment about my cock (7x7)and said that was natural to get a hardon. His son did it all the time, he said. He proceeded to massage me and I got as horny as a guy could get. Bob just as naturally massaged my inner thighs and balls then masturbated me until he jacked me off. I was never so relieved from tension with the massive orgasm he gave me. (I think him and his boy were mutual jacker/suckers. If they weren't they should've been. They both had horse cocks on them.)
I offered to jack him off but he said later on would be fine. I never said anything about it to his boy, my bud, but three weeks later his dad and me were jack/suck buds.