I jerked off in the bathroom at work and someone saw me

This happened a few years ago, when I worked in an office building in the city. I was single at the time and always horny. The office building had a mens room and a woman's room per floor, and a couple of times a week at least while going to the bathroom I would stop and jerk off before going back to my desk.

On this particular day, I was feeling particularly horny thinking of a woman with big tits I had seen on the train on the way in to work. I left my desk and went to the bathroom to jerk off.

The way the bathroom was laid out was stalls on the left, sinks on the right, and a single urinal on the far end of the wall, next to the door of the last stall. This was the stall that I chose because it was the bigger of the three in the room.

I pulled my pants and underwear down, sat down on the toilet, and starting stroking my cock. The idea and act of doing this in a public place like a bathroom always gave me a bit of a thrill (still does), and I had my eyes closed as I stoked my shaft, thinking of the lady with the big bouncy tits I had seen on the train.

I was getting close to cumming when I heard the bathroom door swing open, so I immediately stopped, though my hand was still wrapped around the base of my cock.

I kept my hand there, trying to breathe slowly and evenly, while I waited for the person to leave. I could hear the steps of the person, but then they stopped. I expected something like the sound of someone pissing, or a zipper, or a stall opening, or sinks going on or something, but it was just.. quiet.

I could not figure what whoever it was that came in was doing out there, but my hand was still wrapped around the base of my cock, which at this point was at that angry red/purplish stage of being near cumming. All I could think was that whoever it was was looking at themselves in the mirror and combing their hair or something.

The wait seemed like forever. As I was waiting I slowly slid my hand up and down my cock a few times, keeping myself hard while I waited for the person to leave, but trying to do it so as to not make any sound and let the person know what I was doing in there.

As I started doing I started thinking about how I was jerking off while someone was no more than 4 or 5 feet away from me, which sent an extra thrill through me. Before I knew it, my cock was twitching in my hand and shooting jets of cum up into the air, to run back down my hand.

I managed to do this quietly with no overt extra sounds or moans (this was not the first time I had jerked off with someone nearby), and after I was done I let go of my cock and reached with my left hand to spool off some toilet paper.

As I was wiping off my dick I heard the urinal flush, followed by the taps running and then whoever it was left the room. After pulling my pants up and washing my hands, I left the bathroom and went back to work.

Apart from thinking about how hot it was to cum while someone was in the room, I did not give this experience much thought until a few hours later as the time to leave for the day was drawing near and I had to piss.

I went into the same bathroom and as I was walking towards the urinal I could see something on the floor next to the toilet in the stall that I had used earlier. Curious, I went in and looked and found a bunch of explicit gay porn mags, and a couple of small books of hardcore erotic tales (something akin to Penthouse Forum letters).

It was at this point that what had happened earlier started to clarify more in my mind. I closed the bathroom stall and stood at the urinal, and noted that from that perspective, the crack in the door had a perfect view of the toilet.

Of course I have no idea what may ACTUALLY have occurred outside the stall door, but my head canon is that whoever it was that came in was getting ready to go and happened to see me through the crack sitting with my hard cock in my hand. No doubt I was looking at the door, though I didn't see anything or anyone on the other side. Perhaps whoever it was thought that I was looking at his cock the way he was looking at mine.

In my imagination the guy saw me with my hand on my cock, and his was out; it probably got hard from looking at me. Then when I got impatient and started stroking myself he probably felt like he hit the lottery and started jerking off himself too.

Perhaps after, or as, I was cumming, he came too, spraying his load into the urinal. Then he flushed away the evidence, washed his hands, and left.

I also like to think the same guy came and left the porn in that stall hoping that I would come back and jerk off in there again, though perhaps he went in there to jerk off himself and just left it.

In any case, after going back to my desk I grabbed my backpack and left the office, and as I was going I quickly slipped into the bathroom and grabbed up the magazines.

I jerked off in that bathroom a few other times, but nothing like that ever happened. However it always turns me on (even now) to think about the idea that not only did someone probably watch me jerk off and cum, but that it could have been any of the guys I ran into on a daily basis in the hallways or elevator, who had secret knowledge of me cumming.