I was on holiday and was staying in a large hostel. They had a set of public showers on each floor. Each morning I would go down to the showers and have a long shower. I have a very thick penis even flacid it looks big and love to show it off.
I had a few glances through the week but it was on the last day that I got all the attention. As usual I was soaping up when an older man came in, looked like he was in his 30's. I noticed him looking at my cock from the corner of his eye. I started to get a semi erection and just kept showering as if I hadn't noticed.
The man then turned off the shower and went to the side to dry himself off. He was now openly watching me in the shower. My heart was beating fast because I'd never been in this situation before. He was now fully erect while he was still pretending to dry himself-just as I was pretending to shower.
I soaped my cock until it was rock hard. I then thought I'd give him a show so I started masturbating in front of him. At one point I had both hands around my dick pumping it fast (told you I like to show off). The guy looked speechless. I then started to feel myself on the verge of cumming. So I turned to face him as I shot out four thick white ropes of cum on the floor in front of him.
I then rinsed myself under the shower, grabbed my towel and went back to my room where I jerked off again thinking about what I had just done.