It was early Saturday morning, and I was catching a bus into town to work in a retail shop. I was in my teens and permanently horny. I got off the bus in town and started the short walk to the retail shop, and was about to pass a public toilet, when I decided to pop in for a quick wank. The town was quiet, with a few people around, but mainly quiet since the shops weren't due to open for another half hour or so. In my mind, I thought public toilet, no one around, what a great time and place for a wank. No one would know as they walked past the building that I would be inside wanking. This would be such a thrill. Decision made.

I made my way inside, checked no one was around and walked over to the urinal, pulled my cock out and started working up an erection. It didn't take long, but feeling slightly nervous about getting caught with an erection at the urinal, I decided the safety of a cubicle might be a better place to sow my seed, so to speak. With my semi-hard cock in hand, I quickly scurried over to the row of cubicles and dived into the last one.

Right... time to get down to business. I stood facing the toilet. I was aware that someone coming into the public urinals might look and see my feet under the door and think it strange they were facing in rather than out, and they might suppose I was up to something untoward, such as wanking. But then I concluded it was so quiet in here that I would hear someone come in the main door and I could quickly swivel around, sit down and pretend I was having a shit and they would be none the wiser. There isn't a guy wanking in the cubicle. No, he's just having a shit. So it was on that basis that I decided to drop my trousers and boxers to the floor and stay facing the urinal itself, giving me something to aim at when I shot my load. Wanking standing up was much better than wanking sitting on a cold toilet seat.

My cock was almost at full mast as I lifted the front of my sweatshirt over my head so I could see all the way down my front, directly at my cock. I now had a magnificent view of my hand wrapped around my cock as I started wanking again. Oh god, this was great. I was wanking in a public toilet, and it felt so illicit. My cock was rock hard, and I was so turned on. I was working up a pace and knew it wouldn't be too long till I made myself cum. Oh, God, yes... this was awesome!

I hadn't been at it for more than a couple of minutes when..."Are you enjoying that?"

What the fuck; a voice came from above me. I looked up and could see the top of someone's head and a couple of eyes peering over the top of the cubicle and looking down on me as I stood there, essentially naked all the way down my front to the floor, my cock in hand.

"Heh... What... errrhh... What are you doing?" I blurted out, completely taken by surprise and at a loss for words... well, sensible words at least. I had been caught red-handed wanking, and my face went an immediate bright crimson as I blushed and attempted to cover up my erection.

"Surely you mean what are you doing? I'm not the one who's wanking, am I? I asked if you are enjoying that?”. He seemed very self-assured and was smiling down at me.

Standing partially naked, trapped in a cubicle with someone looking at you, covering up your now wilting cock, which is oozing pre-cum, was the last place I wanted to be having a conversation with a stranger. I had been caught red-handed wanking. This was so embarrassing. I couldn't think what to say, so I just answered him truthfully.

"Yes, I was... until you interrupted me."

"Oh, don't let me stop you. You go for it. I won't tell anyone."

I was somewhat taken aback. I wasn't expecting that.

"What ?!!"

"You heard me, go for it."

"What... with you watching me?"

I was setting myself up for a fall because he immediately just said, "I've already been watching you... Haven't I?"

"Yes... but... ummm... errr... " I was somewhat dumbfounded and didn't know what to do.

"Just do it. Grab your cock and wank it for me. I won't tell anyone."

And with no answer at hand and seemingly no choice, I did. Tentatively, I grabbed my cock and started stroking it again, and despite my not wanting it to, or indeed expecting it to, my cock started responding and before I knew it, it was growing hard in my hand! Oh god... I knew he could see it growing again... and I was now embarrassed at it getting hard in front of him. He now knew I was getting turned on. Shit shit shit...! I was getting off at being watched... I couldn't believe it... I am virtually stark bollock naked, standing in front of a stranger, my cock now rock hard, wanking my cock for a stranger, and the most turned on I have been in my entire life. What the Fuck!

But it didn't stop there... the guy was soon encouraging me...

"Oh yes, that's it... That's a great cock you've got there... show it to me... show me that hard cock of yours... yes... wank that cock... look at you wanking your cock... You dirty fucker... what a wanker.... yes... yes... wank that cock..." and all this time, I was weirdly not too concerned about my unexpected audience above me, but instead I was more aroused with what he was looking at, namely my cock.

It seemed that rather than being put off by his commentary, I was excited by it. I even leaned backwards to ensure he was getting the best view from his vantage point. I took a glimpse upwards and could see his face was now wholly in sight. He had an awesome view, I'm sure. There was no hiding anything from him. He was watching me wanking my rock-hard cock in all my glory.

"Face down and look at your cock, not me... You fucking wanker... yeah that's it wank that cock..."

Then, out of nowhere, another curveball: "Have you ever fingered your arsehole?"

Yikes! I looked up at him, but I failed to answer him. I paused too long.

"Ooh... you have, haven't you...? Right, go for it.... get a finger up there for me? "

"But... "

"Eyes down... and just do it... You're the dirty wanker... wanking in a public toilet... just do as you're told... "

I felt I had no choice, so I set about doing what I had only experimented with occasionally in the privacy of my own bed. I didn't do it that often because it didn't do much for me, but I did it occasionally because the illicitness of the act turned me on. It was dirty, and that was what turned me on. But now being asked to do it in front of a stranger, well, that just set my horniness off the charts. This was crazy. Spreading my feet slightly, I let go of my cock and pulled my right cheek as I attempted to push the middle finger of my left hand into my arse.

"That's it, get it right up there... keep going.... is it right up there? Is it right up your arsehole?"

"Yes... Yes... Yes, it is..." and I was glad to grab hold of my cock once again.

"Wow... You dirty fucker... Tell me where your finger is... ?"

"It's up my ass..."

"Now wank that cock of yours... and finger fuck your ass... You dirty fucker... Yes wank your cock... You dirty wanker... What are you?"

"What?!" I was wanking my cock furiously with my middle finger up my arse and was desperate to cum, but at the same time, I didn't want it to end.

"You're a dirty wanker... say it... what are you ?!"

"Errr... I'm a dirty wanker... " I said feebly in more of a whisper...

"Again.... louder... I want to hear you properly."

"I'm a dirty wanker..." this time louder. My cock was rock hard, I was so turned on. I leaned back as far as I could, showing him my rock-hard cock... and pushing my finger further up my arse... god, why was I doing this for him... because I was so turned on that's why?!

"Yes... again... keep saying it... wank that cock... and finger your arsehole... and keep telling me what a dirty wanker you are until you shoot your load... show me... shoot that fucking load... "

I was nearly there. Oh god... I'm going to cum; he's going to watch me cum. I wanked my cock, I fingered my ass, and all the while told him what a dirty wanker I was. It was all too much for me.

"I'm... a... dirty... wanker... I'm... a.... dirty.... wank....er... I'M A DIRTY WANKER.... I'M A DIRTY WANKKK,,,, AAAARRRHHHH.... "

Cum shot out from my cock, and I proceeded to plaster the toilet cistern in front of me, shot after shot going everywhere, my arse cheeks squeezing tight the finger up my arse. Eventually, my hand slowly came to a halt, squeezing the last remnants of cum from my cock. I stood there momentarily to recover, trying to figure out where to start in terms of cleaning myself up, a cum-covered cock and fingers, and not to mention I still had a finger up my arse.

I looked up, and the stranger was gone. I could hear him getting down from the toilet in the next cubicle, that he had no doubt been standing on, and then I heard the lock on his cubicle door opening.

"See ya, Wanker..." and he was gone.

EPILOGUE

This all happened years ago, and I recall leaving the public toilets somewhat nervously. I was so frightened of bumping into the stranger or seeing him across the street with someone and him telling them, " There he is... the one I was telling you about. That's the wanker I told you about."

Over the years, I went on to imagine all manner of situations where he embarrassed and coerced me into performing for him again, taking things a whole lot further, who knows, like him bursting into the cubicle, stuffing his cock in my mouth, forcing me down and sticking his arse in my face and having me rim him, to bending me over and taking me up the arse, to someone else walking in and joining in, spit roasting me, cleaning up their cocks afterwards with my mouth, leaving me tied to the urinals with my mouth and arse presented to anyone that came in to use me. You name it, I have jerked off on this and how it happened and numerous variations in my mind that finally made me cross the line and seek out physical bisexual encounters.

By the way, I did manage to get to work on time that morning. I also had numerous impromptu erections throughout the day. I just could not stop thinking about what had happened, and I jerked off thinking about it throughout the day at the store, sneaking off on toilet breaks, until one last wank late that night in bed. I really was a dirty wanker back then, and nothing much has changed since.