Ok guys these seem to unreal to be true but This actually happened to me three weeks ago.

I work in a classy office building in Hong Kong and often take the stairwell down and up eight floors as a form of Excercise, a couple times a day.  At 2:00  I go down like clockwork to get a coffee in the lobby.  I was walking down slowly three weeks ago and when I got to the second floor I stopped to check my iPhone emails.  As I was quietly reading I heard a sound that sounded like pipes banging or faint construction work.  I listened more carefully and could not believe it, but it sounded like sexual moaning within the noise? 

I thought is somebody having sex in the basement level?  Had never gone below the lobby level, it only leads to an emergency exit corridor.  But I could not help myself so I slowly and quietly walked down and could hear a distinct sound of moaning and pipes banging.  I walked closer to the sound but still could not see anything.  I stopped and looked up at the ceiling thinking maybe someone is having sex in a room above and it is sounding thought he floor? I was totally confused.

Before going back I went up to a railing where the final set of stairs led to the emergency exit and peered over down below.  I could not believe what I was seeing.  A middle aged Hong Kong woman in a suit had one hand holding on to a pipe and one leg stretched along a space under the stairwell.  She was sort of doing the splits at about 100 degrees.  The other hand was rubbing her pussy hard.  She was rocking back and forth and moaning louder and louder.  It seemed she may have heard me approach and it was getting her more excited that someone might see her masterbating!

Ok what happened next was not predicted.  I got an instant erection but was afraid for some reason.  I quickly stepped backwards and quietly walked away.   It was the most erotic site I have even seen and the image gave me an erection and still does whenever I recall it, but for some reason I thought maybe she was crazy and it would be dangerous if I had approached.  Now I think she was just truly horny and she might have just rubbed harder if I approached and I could have put my arms around her and made a neat friend?   I googled the subject as I thought this was so strange. Supposedly some woman have hormone problems and may have uncontrollable sexual desires leading to deviant behavior at work.

Now I slowly listen every time I get my 2:00 coffee and think I might approach her and ask her if she is alright in a friendly sort of way.  It seems like such a fantasy come true. Unfortunately I did not even see her face as I was looking down on top of her, so I can not say 'Hi' if I see her walking around.  I could tell she had a good body.

Can you believe that I walked away in fear!  This was a once in a lifetime experience and I blew it. A true good looking sex-crazed Asian, might have even been a virgin, to get so worked up in the office like that!  I thought I was horny but at least I save that for after work.

What would you have honestly done in this situation considering it is your place of employment?

With a Camera phone in Hand may u should have shot a video.
I had been waiting to see her face,  think it's good to know who is the hot girl in ur workplace.

if you didn't see her face how did you conclude she was middle aged ?

Hopefully you'll get another chance! Wish that would happen to me...

We should run a poll: would you walk away? or would you stay and introduce yourself?  

... certainly the 'safe' option is to walk away: someone who is sufficiently uninhibited to choose a public place to rub herself, and lacks the self-control to do it quietly, might also lack the self-control to hide an office fling.  She could so easily have gone to the ladies, and done her thing in complete silence, with noone the wiser - but no, she chooses the risky option, where there's a good chance a security guard or a cleaner will discover her - and THEN she lets rip with her sex voice.  
We all know the plot of "Fatal Attraction", and discretion is the better part of valour.  

... but on the flipside, truth is often stranger than fiction: your story reads like the perfect introduction to an erotic novel or short story.  And, who knows what will happen next??  
I'm ready to bet her activity was not a one-off, neither the first adventure she's had nor the last.  Now you have the intel, you can look out for her, and prepare your approach when you next catch her in need ... maybe with a raincoat ready in your pocket ...   

For sure, someone who can spread her legs in a stairwell, and completely loses herself to her own touch, is going to be a tiger in a hotel or on a deserted park bench when strong hands impale her hips firmly onto a warm hard cock.  

I think you haven't reached the end of this story yet

It is moments like these where you should use you camera phone or video!
Are you drinking more coffee now?

nice writeup.  so have you been going back the same time everyday?  If she is still there, I would say the signs are pointing in the right direction to scope out.....and report back

Actually he doesn't have to go back every day. He should wait until October 8-12 which is about 1 month since he spotted her at her horniest. When it is that time of the month when a girl is at her horniest, watch out because there may be opportunities from even the homeliest/good girls who cannot help themselves.

now then you are assuming she is on schedule....with chicks you can sort of time it but never know with them.  ask anyone in a long term relationship.....the mysterious of the female!

It's definitely a good point though - even if they're unpredictable about which days (or weeks) they do still have a high and a low

Worth waiting 2 weeks or so, then being more vigilant, to see if she repeats

I can see it now ... bubba's waiting and waiting and waiting ... hair getting longer ... growing a beard ... getting grey ... decades pass ... then the woman comes back ... does her thing again ... bubba strikes up the courage and goes to her ...

wonder if a granny would sound the same ?

Good luck on getting another one of these opportunities. Should have left for a breath of fresh air and came back wheb u were ready.

Gotta be tricky approaching her with out spooking her and ruining the moment.  Maybe get within view, whip it out and start stroking then gently clear your throat to get her attention. At least when she looks and see's you, you are both on equal terms.

oh bummer you could have been tat pole