Hope I can tell this without writing a novel ...
Summer job as a Camp Councilor. Cabins had two wings off a central two story loft. Each wing had a front and back bay, separated by a half wall. Each bay held 20 single bunks in two rows. On the first floor, in line with the front door, were lockers, on each side, leading to the general bath room, with open showers, closed toilet stalls, sinks, etc. In the loft above that was "Councilor Territory". Two single bunks, next to "slatted" banisters, so we could look down over the entire first floor bays. We also had our own half-bath with a toilet, right behind the door, and a sink off to the side.
My fellow councilor was a brown haired, brown eyed, "football" Hunk named Tom. His younger (equally "Hunky") blond haired, blue eyed, brother, Danny, and another tall, slim, guy named John, were "kitchen boys", and general camp "labor". Those two had the back bay, on my side of the cabin, all to themselves. They'd put up sheets, and stuff, above the half wall, to give themselves some privacy from the campers.
One night, when the campers had gone to sleep (supposedly), Danny and John were up in the loft with Tom and I. We were all stripped down to our "tighty whities". It was rather Warm up there, even with our window open.
Not sure how it got started, butt Danny ended up, on my bunk, with his heels over his head, and lighting farts in the dark. It was the first time I'd ever seen a blue flame shooting out of a guy's, tightly stretched, undies!
Several days later ...
Afternoon, after lunch, Tom and I were watching "our" kids, along with all the others, playing in the common area ringed by cabins. I had to pee.
So, I darted over to "our" cabin, and sprinted up the stairs to the loft. The bathroom door was closed, butt I knew Tom was outside.
I opened the door, and there sat Danny, tee shirt behind his head, undies and shorts down to his ankles, sitting on the toilet with his Big, Plump, Dick in his right hand.
I'll never forget the look on his face, with his WIDE open blue eyes, mouth forming a perfect "O" in surprise, while white ropes of cum were shooting out of his swollen, pink, dick head!
I said, "Sorry, Man!", and closed the door. Went downstairs to the "common" bathroom, and closed myself in a toilet stall. It's not easy peeing with a Hard On, butt I really Had to! And, since I was "On Duty", and didn't want to be "missed", I just tucked my Boner, back in my shorts, and headed on out hoping "Animal" would go back Down.
It's kind of funny how this thread brought that distant memory back UP!