Mine is a little out of the context of the original question since I was almost caught, was fully dressed, and was at work... but still an interesting story. Essentially my office was off of a work area and there was a large storage closet that could only be accessed by entering my office. Whenever I would jerk off at work, which was frequently, I would usually shut the door to my office, then actually go into the storage closet and also shut that door for a double layer of protection. If I should hear someone unlocking my office door, I could just zip up and pretend to be working in the closet. In the many years I was in that office, no one ever tried to get in when the door was shut. And on top of that, the only people with keys to the storage closet were me, a female coworker, and facilities. It would have already been pretty safe to just shut my door and jerk off at my desk, but it was extra safe to do it in the storage closet. Well one day I was particularly horny and had been watching porn on my phone for about an hour on and off. At that particular moment, the female coworker with keys to the storage closet happened to be in the work area outside of my office. I debated for awhile whether or not I should just go for it. She RARELY ever went in that closet and I was so worked up it wasn't going to take very long. I decided to go for it. I didn't shut my office door because I didn't want to make a big to do. I headed into the closet with an empty Styrofoam cup to finish in. I put the cup on a shelf near groin level for easy access when the moment came, whipped it out and started jerking. As anticipated, it didn't take very long. But just as I felt myself pass the point of no return I heard keys in the storage room door. All I could do was put my dick back into my pants and crouch down to hide my erection and the fact that my pants were still unzipped. She walked in as my dick uncontrollably blew my load in my pants. She seemed completely unaware that anything was odd. She came in, grabbed some stuff and headed back out all the while making small talk. I had a huge wet spot on my dress pants that was pretty visible, and I only had about ten minutes before I had to cross the work area and head into a meeting. I put on a jacket and that helped to cover it for the most part, but I had to keep fussing with the bottom edges of the jacket to keep the spot covered as I walked. At the time, the whole thing was scary, but in hindsight was pretty hot. I'm gay, so I didn't really get off on the fact that a female was in the room as I blew my load, but it was still interesting.