Checking out other guys was never my thing, neither was rating guys on a mental hotness scale, but I have also been able to admit when someone is attractive or not. I didn't have any siblings growing up, but if I did, I'd be able to tell friends if my sister was hot or not. This guy I was showering with wasn't going to make any top 10 lists, but he wasn't unattractive either. He was fairly muscular, especially his pecks and triceps, but his stomach wasn't anything to write home about. He seemed to be getting back to the gym after maybe missing it for some time.
The shower started off uneventful. We took turns in the water, soaped up individually, and didn't say anything to the other. That was until he asked if I could soap his back. It was a weird request to make to someone you met literally three minutes earlier, but I know how difficult it is to scrub one's own back, so I obliged. I needed to get pretty close to him in order to scrub nice and hard, and in doing so, my penis accidentally brushed his bare ass several times. That little bit of contact, plus the fact that there were no washcloths, meaning that I was scrubbing with my hands, made my penis partially erect.
He then turned around and asked if I wanted my back scrubbed. I always like a solid scrubbing, so I agreed. We traded spots and he started scrubbing. He was noticeably closer to me than I was to him, so close in fact that his cock was gently resting in my asscrack. He was also harder than me, almost fully hard.
As he cleaned my back, I felt him rubbing my ass with his cock, which was only getting harder. He then said, "Are you enjoying this?" I replied no and that my wife was waiting for me outside. His reply was "Your cock says otherwise. Look how hard it is." I could feel that it had been getting harder, but I can't say I was paying attention to how large it had gotten. I too had a full hard on. At that point, he spun me around so my back was now in the water, and got on his knees. Once there, he took my cock in his mouth, and started pumping. He really knew what he was doing. Starting slow and quickly speeding up, he had me ready to cum. Since he didn't ask before blowing, I didn't ask before cumming. He took my whole load like a champ without spilling so much as a drop or gagging on it either.
The reality of what had just happened set in, and I realized that I needed to head out. As I grabbed my towel from the far side of the shower, he asked for my name. I told him he didn't need to know that. Once I got to my wife, she asked if everything was alright, and with a smile said "everything's perfect."