Grab Ass in the Pool
At 13, I also used to live near a large Army base. My dad was a subcontractor there in electronics. I had a full time base visitor pass that I could use 24 hrs.
I would use the pool and play grab ass with the men. I would also have mutual jack offs with them. I never had it so good for over four years. We would mutually jack off in the steam room.
Then there were the holes in the partitions in the toilets where we would jack off each other. I think I jacked off every kind of cock in the world! I also became a very good swimmer.