This experience occurred when I was in my late 20s. At that time, I was extremely fit and competing in kickboxing. I had to keep myself light for my weight category, so I reckon I looked decent. Even if I do say so myself.

I trained at a kickboxing club six nights a week and worked during the weekdays. I lived with a girlfriend who was very understanding of all my activity elsewhere and we still somehow managed to have lots of quality time together. We're still together, so it must have worked out. I did eventually have to scale back the six nights a week, though.

As an early riser, I had also started going to a small gym at 5 am on the mornings before work.

I would do some weights and run a few miles on the running machine.

The gym was in the grounds of a hotel, for the use of guests and gym members. It stood alone in a converted Victorian industrial building with very thick walls. I usually had it to myself at such an early time. The gym wasn't staffed until later, but hotel guests and gym members could access the building using a door code.

After a workout, I would use the showers so that I could go straight to work from there. Unlike a lot of modern gyms with individual showers, these were in one row together. A wall stood between the shower area and the changing room.

I would strip off in the empty changing room and then take my towel and shower gel round the wall and use the furthest shower.

Even though I had it to myself, I felt extremely aware of being naked in a public area. It wasn't something that I had any experience of. Not since my schooldays, anyway.

I found it thrilling to be completely exposed in a place that strangers might enter. Even though this was unlikely. As soon as I undressed, I would start feeling aroused.

At that time, I was very lean and had developed pretty good muscle definition. When I first started noticing these results on my body, this led to the new dimension in my sexual arousal, from seeing my own body.

In private moments, I saw myself naked in the mirror and found the sight arousing. I got further turned on at the "voyeurism" of watching myself masturbating.

It had occurred to me that there was a gay element to this. To be turned on at the sight of your own male body and further aroused seeing your hard cock being stroked.

Sometimes when my girlfriend and I did it in front of the mirror, I was enjoying looking at myself as much as her. I don't think it was narcissistic because for me was just appreciating the male form in its sexually aroused state. It just happened that mine was the only one I got to see.

In the gym, the feeling that I might be seen, with nothing on and my swollen cock swinging around, got me excited. A few times, when I felt sure the gym was empty, I even risked masturbating in the shower.

I had only ever seen myself as straight. Now the idea of being seen naked in a men's changing area was fuelling gay fantasies. I was only likely to be seen in there by a man, after all.

One morning I had stripped off, as usual, and was enjoying the shower.

I don't have any proper vices, but I do really love having a long hot shower. It's something I find therapeutic. I will daydream and lose all track of time. At home this was too expensive, but at the gym it cost me nothing. I must admit I took the piss with how long I showered there.

So, I had been luxuriating in the shower for a long time and the whole room was very steamy. I was enjoying being naked and fantasising about some kind of sexual interaction there in the shower. I was taking my time and only occasionally giving myself a stroke.

I was sporting a decent semi which was well on its way towards becoming a full erection. I was idly imagining being seen like that when I got the shock of my life as a guy really walked in. We made eye contact and even more of a shock, it was a guy from my office called Pete. We were even in the same team.

We knew each other well, although not at all in this naked context.

He didn't seem to bat an eyelash as he greeted me and proceeded to shower. I wasn't sure but thought his eyes had flicked down. Had he registered my state? I felt embarrassed and, without making it obvious, tried to face the wall more until things calmed down.

I glanced at him whenever I thought he wouldn't notice. He had an average build, slightly soft-looking body and I was weirdly intrigued to notice he had a very small cock. I found it slightly strange, therefore, that he seemed so relaxed about showering in public.

He didn't seem to be shy at all about it. I felt surprised by how much I found myself attracted to his small cock.

Now, ok, I know, I am not exactly massive myself. I have quite a modest package, but right at that moment, seeing him in comparison, made me feel like I had a monster between my legs. Especially in my current state.

Out of the corner of my eye, I felt like he was stealing looks at me too, but I wasn't sure.

For whatever reason, being the bigger guy and already quite aroused was doing the opposite of helping me calm down. My sizeable semi was turning into a full-on erection. I felt sure Pete could see this, even though I was trying to act like I just happened to be facing the other way.

Nothing was said.

Pete washed himself in what looked like a normal way. But I did notice that his small cock seemed to have grown a bit and become semi-erect. It was small but perfectly formed.

I felt sure that he was also stealing glances at me, as much as I was at him.

I was feeling conflicted emotions. At the same time as feeling embarrassed, I was also sexually aroused, thinking that he was seeing me naked with an erection.

I was feeling even more aroused at the possibility that his cock had grown because he liked what he saw. I felt sure he had already soaped that area of himself more than once.

I kept wondering about what he thought of the sight of me. I felt like I was in peak condition. Maybe he was enjoying the look of my whole naked body and not just my rock-hard erection. Maybe seeing me in my sexually aroused state made him consider my whole body in sexual terms.

I really felt a need to be seen clearly and casually turned to face him more.

I pretended I was just busy with soaping myself and rinsing. Moving my hands over my lean abs and across my defined thighs. I felt turned on by the thought that his eyes were fixed on my cock as I soaped it slightly too slowly.

At one point when he had his back to me, I allowed myself to risk properly stroking my cock. When he turned back again, I had stopped. I didn't dare do anything obvious.

Honestly though, I wasn't confident how much of the scenario was just in my own imagination.

He eventually finished up, grabbed his towel, and casually mentioned seeing me later at work.

He did look my way as he said it, and I felt sure his eyes flickered down again to my cock. Maybe he was memorising the sight.

As he moved, I also stole a last glance at his small cock before he grabbed his towel. You sometimes doubt what you see, when its quick. But I felt sure it looked redder and pretty much fully erect. I didn't get time to check for sure, as he disappeared around the wall to the changing area.

I was on my own again with an absolutely raging hard-on. It was begging for attention. I couldn't remember a time I had felt so turned on. He had barely been gone a moment, and I took hold of my throbbing cock and started stroking it fast. I quickly came and watched as multiple spurts of cum shot out and hit the shower floor, to be washed away.

At last, my erection started to subside. I washed off and turned the shower off. I grabbed my towel from the hook, dried myself, and wrapped it round my waist to enter the changing area.

By then Pete was already gone, which saved any embarrassment.

We worked together for a year or two after that day. Whenever I saw him in the office, it felt strange to know that he had (probably) seen my erection and that I knew what he looked like naked with a small erection.

Nothing was ever said, and I really don't know what he saw and what he thought. If this was a work of fiction, obviously, we would have done a lot more in that shower. I hope you're not disappointed, though, and can enjoy this story more for the truth of it.