A fond memory!
I learned how to jack off when I was 9.
At about age 10 my family ran an inn in Southern California.
One time we had a visiting junior college basketball team staying at the inn and my brothers and I got invited to their game in a near-by town. Not only that, but we rode on their bus and went with them into the locker room. Watching them get dressed for the game was great, but what happened after the game was much better. They won the game by a large margin so they were in high spirits and very playful in the locker room as they stripped and showered. To get out of their way, I climbed on the top of a 7-foot dividing wall between the locker room and the showers. There was one large shower room and several small individual shower stalls with walls about waist high. There were naked bodies everywhere I looked!
One of the players, a huge black guy in a jock strap, had pulled a groin muscle during the game, so a trainer had him lay face up on a table (just under where I was sitting) while the trainer tended to the injury. The player's bulge was enormous, as you would expect from a 7-foot black basketball player.
The trainer was using some kind of pink lotion on the muscle and, as a joke, took some on his finger and quickly put a streak on the player's crotch, making it look like the slit of a cunt. Everyone near by laughed and the player jumped off the table and walked over to his clothes where he stripped off his jock strap, grabbed a towel and started walking to the shower. From my vantage point I could see that he had a massive hard-on. I mean it was enormous.
As he walked by his coach, just beneath me, I heard the coach quietly say to him, 'You need to go take care of that.' The player went to one of the farthest individual stalls, turned on the water, and as he stood under the shower head, to my shocked 10-year-old amazement he took his giant cock in his huge hand and began to jack off. My wall was just high enough that he was exposed down to his crotch.
I guess he didn't notice me up on the wall- or he just didn't care- but I got to watch him from beginning to end. Even then I knew enough not to be obvious about it and I would watch him out of the corner of my eye and gaze around the room so that I could often glance directly at him. It took him about 5 minutes of hard jacking, then he tensed and shot an enormous load on to the shower room floor. He then finished his shower, toweled off and went back and got dressed.
We rode home on the bus in the dark- me with a raging hard-on all the way, but not with enough courage to 'take care of it'. That had to wait until I got home and got in bed.
This memory has been a masturbation fantasy my whole life. Even at age 10, I would have loved to have given the guy a 'helping hand'!