This happened a long time ago when glory holes were much more common than they are today.
I went to a large department store which had a very active restroom on weekends. On weekdays, it was much quieter.
I was there late morning and the place was deserted. I sat down in the end stall and noticed that someone had started carving a glory hole and was about half done. I was able to slide my forefinger through the hole about halfway.
Shortly after I arrived, the outer door opened and someone came into the neighboring stall. He pulled his pants down and sat on the toilet and began stroking a small dick with tight balls and bright red pubic hair. That was all I was able to see through the hole, but I liked what I saw and so started stroking my hard cock too. He stood up and put his dick right against the hole. Even though his dick was pretty small, it still wouldn't fit through the hole, so I stuck my finger through and he began rubbing his rigid cock against my finger for a few minutes. He stopped and sat down and stuck his finger through, so I stood up and put my cock against the hole and rubbed my fat cock head against his finger.
It felt ok but nothing like a good stroke, so I whispered for him to stick his cock under the partition. I heard him get up and open his door. I also stood up and opened mine and walked over to his stall.
He was a very cute young guy with a hard slim body, about eighteen and his cock was rigid and sticking up against his belly. He had the reddest bush I had ever seen and I immediately started stroking his pubic hair while I stroked his cock. He grabbed my cock also and began stroking really hard and fast. It was so hot that I knew I wouldn't last long. I reached down with my other hand and started playing with his tight little balls. He immediately gasped,' Its cumming' and shot a huge load of cum in my hand. I used his cum to bring myself off and shot right into his pubic bush.
He got a big smile and stood there with my cum dripping off his cock, massaging it into his still rigid cock while he continued to stroke my cock. I was ready to go again, but the outer door opened so I zipped up and left.
I never saw him again, but I jacked off many times thinking of him and wishing we had done more together.