I have just returned from a week's holiday in the sun. The bathroom of the hotel had a bath with a hand-held shower, and on the opposite wall was one huge wall-to-wall mirror stretching from the top of the vanity unit to the ceiling.
On the first morning, I was having a shower and caught sight of me soaping myself in the mirror. This immediately got the juices flowing, and I started to get a hard-on as I was soaping my cock. It was as if someone else was in the shower with me; the sight of this was so erotic that I could not help pulling my foreskin back and starting to wank. I quickly rinsed off all the soap, by which time my cock was harder than it had been for some time.
I stood there in the shower, slowly wanking with the showerhead spraying onto my cock and balls. Because I was so turned on, I didn't last long and had a very powerful orgasm, shooting more spunk than usual all over the shower. Needless to say, I thoroughly enjoyed wanking off to my own reflection every morning after that.