Back when I was 13, my dad began taking me to the local swimming pool every week to exercise. I was a very indoor kid and I guess my parents thought it would be a good idea. Though reluctant at first, I began to enjoy the sessions and even bought a new pair of swim briefs. I would also glance at a boy named Tim while I was there and jerk off to fantasies about him.
For the first few weeks, I only spent time in the heated indoor leisure pool. On my fourth or fifth week at the pool, my dad wanted me to join him in the outdoor pool for some serious swimming. I wasn't fond of the idea because that meant I would be away from Tim, who usually spent his time with his family in the indoor pool.
As a side note, it was around this time that I started to get self conscious of how my bulge looked in my swimsuit. My swim briefs weren't super tight but my penis still showed whether it was flaccid or erect. Before going into the pool, I would drape my long towel over my shoulder, partially obscuring the view.
Dad and I got the pool in the early morning, changed into our swimsuits and headed to the outdoor pool. I got the shock of my life when I entered the water. It was freezing! I felt my dick, which had been semi-erect just by being at the pool, contract and shrink as the cold water touched it. Dad noticed me shiver as I entered and laughed a bit, before spending the next hour helping me with my swimming.
My swimming was very poor, so by the end of the hour I could only swim a few feet before needing to stand up and breathe. The cold water was making me need to pee real bad, but I held it in. This worked for a few minutes but I couldn't hold it for too long. While I could have just gone right there, I decided to go back inside to use the toilets in the change rooms, as an excuse to leave the cold water for a while.
As I stepped out of the pool and walked across the concrete, I immediately felt warmer. The weather was quite nice and the sun was already high in the sky for such an early hour. As I entered the near empty male change rooms and headed towards the urinals, I saw a familiar face standing there. Tim! He butt looked great in his swim briefs - tight and clinging to his butt, clearly showing his butt crack. I quickly walked up next to him, hoping to take a peek at him before he left.
His stream was still going strong, and he smiled at me as I joined him. "Needed to piss too?", he asked me and I nodded. I untied the strings on the waistband of my swim briefs and let my dick flop out. Within seconds I started to pee, with my semi-erect penis sticking straight out. I tried to hide my boner from Tim but he could clearly see it.
When we had both finished peeing and shaking out the last few drops, Tim said something I did not expect. "Hey, do you want to jerk off with me?", he asked, completely straightforward as if this was a normal thing to say! I was completely stunned but I must have nodded my head slightly because the next thing I knew, Tim had grabbed me by the wrist and was leading me towards a shower stall!
Tim locked the door behind him, loosened his swim briefs and let them drop right down to his ankles with a soft splat. "Your turn, buddy", he encouraged me and I instantly dropped mine to my ankles too. It took me a few seconds to take in what was happening. I was locked in a shower stall with a naked teen boy right next to me! Tim began to roll his penis like a sausage between his left and right hands and in an instant it was fully erect. My own penis was pretty much fully erect throughout this who thing, so no sausage rolling necessary for me!
Tim and I were facing each other. Our boners were outstretched as if they wanted to give each other a handshake. Tim started first, quickly stroking his penis with his right hand. I did the same with my penis. For the next two or three minutes we pumped and pumped, occasionally glancing into each other's eyes, but mostly just staring at the other boy's naked body. I could see Tim's face becoming redder as he stroked faster. Meanwhile, I used my left hand to fondle my balls.
I came first, with a few ropes shooting straight out and landing on Tim's leg. This must have set him off because a few seconds later, Tim came and I felt something hot and sticky on my stomach. I'll never forget that right after that moment, I was staring at Tim's dick and his balls were tightening after each squirt. It was awesome to see that!
For about half a minute we didn't say anything. Just stared at each other and the mess we had made. Then, I suggested we quickly shower (couldn't have white globs on our bodies when we went out could we?!). While I really wanted us to shower together, Tim went to the next stall and showered there. Guess it might have been weird if anyone saw two boys in the same stall.
While I was finishing off my quick shower, Tim knocked on my door. I opened it and saw him pulling his penis out of his swim briefs, spinning it a few times and putting it back inside his briefs. I quietly laughed and turned of the shower taps, exiting the change room with my new jerk off buddy.