Dressing Room Romp

This happened when I was very young I must have been 16yo., I played rugby for my school this one time I playing local not fare from my school.
We had just finished the game and we were very dirty and sweety but the showers at this place was dirty and smelt bad so me and one other guy thought we would go to our school showers which was not fare away we could walk it in 10 mins and they were better showers anyway much cleaner.
We talked on the way about rugby and shit like that until we reached our school, the place was very quiet because it was the end of school but you could still go in because the teachers was still in, we got to the shower block and took our dirty cloths off and got in to the showers. I never took much notice before and I don't know why I did today mybe because we were the only ones in the shower where normally there are many of us, I noticed that he had a lovely looking bum tight and muscler and I couldn't stop staring at it as it glistened with the water washing over it I could feel my cock getting warm with the blood stating to flow in to it, at that moment he to face me "you like what you see" he laughed then turned around and shook it at me as he left the shower.
A few minutes past and I followed him I entered the dressing area and he was still naked with one foot on the bench and his back to me he was slightly bent over with his ass sticking out I couldn't resist it my cock was now fully erect so I walked over to where he was and slowly touched he ass with my cock he did move a inch so I moved in closer putting my cock between his cheeks again he never moved I proseded to rub my cock up and down I felt him loosen up he never looked around so I rubbed harder then placing my hands on his hips I I started pumping harder he pushed back to support himself and I shot my cum all over his ass and back I let go of him and he turned around, "I will need another shower now" I looked to the ground sheepishly as he left the dressing room. (to be continued)