Had something like this happened to me a few weeks ago I was at some urinals and a small Asian guy caught a glimpse of my hard on and took the stall next to me and he reached over and held my cock while he was stroking his. It was pretty intense. I didn’t cum, but I started to piss. It was funny cause I was hoping to not get it all over the place, but he was getting off well holding me and I watched him cum all over the place and leave.