When the class ended, all of the kids went to the locker rooms to change. A few minutes after kids stopped coming out of the locker rooms, I assumed they were all done, so I went in to change. I heard a shower running, and I figured a boy was taking longer than the others, but I changed into my swimsuit anyway. As I did so, I could hear occasional giggles coming from the shower area, but I didn't pay much attention to them. After I had changed, I went into the bathroom to use the toilet, and I noticed two pairs of feet beneath one of the closed shower curtains. There were two boys in the shower together, and they were both giggling! I wonder what was going on in there...
While I was using the toilet, I heard the shower turn off, the curtain open, and two pairs of feet leaving. When I was done, I left the bathroom and went back into the locker room area. As soon as I turned the corner, I saw two naked boys standing facing each other, smiling, and holding onto each other's hips. I caught a brief glimpse of their erect penises touching before they noticed me and jumped away from each other. Their faces turned beet red and they stared at me in horror!
I felt bad that I had embarrassed them and interrupted their fun. I wanted to let them know that it was okay, but I didn't know how to do that without sounding like a creep. I gave them what I hope was a reassuring smile and went on my way.