As a beginning sophomore, my school's security guard lived on my block and I had been friends with his son for several years. His name is Nick.
Since his father was a security guard, we had access to the school quite often when his dad was in the building on duty, or he would often just give us his keys to allow us to swim in the indoor pool.
In that day, guys were required to shower nude after gym class and all swimming classes were also held "in the nude" during school hours. So nudity in the school pool was very common. Nick and I would go swimming most days during the summer. Since we were locked in to the pool area and nudity was so common anyway, we would often get hard while wrestling in the pool. Many days we would get out of the water with totally hard cocks and climb into the bleachers to either jack off or eventually we started sucking each others hard cocks to completion.
We only had one close call. There was a young (probably around age 24) coach who was doing his student teaching who unlocked and opened the pool door and saw Nick sitting on the pool edge while I was sucking his hard cock. We didn't know we had been seen until we went back to the shower/locker area to clean up and dress and saw the young teacher stroking his hard cock in the steam of the shower. We watched him shoot his spunk while we were looking around the corner of the lockers, then we left. He never reported us, but he did give us special privileges when he was teaching the class from then on.
This story is totally true and I still j/o while thinking about it today.