Unexpected Pool Fun

I was about 17, at a friend of my mom's house. We were in their three foot deep above ground pool with her 14 year old son. He wants to ride on my back, piggy back. He hops on and wraps his legs around me to hold on. Well, his heels fall right about at that very pleasurable spot that us guys have, in the crotch area. Ok, I figure he is just hanging on any way he can. I move around, so his heels are no longer pressing against my crotch. A few seconds later, there they are again, pressing against me, disconcertingly but delightfully at the same time.

It becomes obvious that he knows what he's doing. He's seems intent on seeing how I react to his bouncing heels that, I'm at the same time trying to avoid and am thoroughly enjoying. Our moms are also in the pool, so I can't say anything, and since I'm actually enjoying it, I wouldn't anyway. There's no longer any point in attempting to stop his movements because my pleasure has overtaken any desire to maintain decorum. He obviously feels what's going on under my bathing suit and is intent on finishing what he's started, and frankly, I don't want it to stop and in no time, I'm in overdrive anyway. Once I finished (a totally satisfying ejaculation it was!), he whispered, ('you're a bad boy'). I never acknowledged it and we never mentioned it after that. We never had occasion to be in the pool again after that, although, I must admit, I would have been quite ammenable to an encore performance! Obviously, the experience lives with me still after many decades. I had to share and am just as aroused in relaying it now as I was originally. I had to share!