I used to work in an area of an office that had huge single bathrooms, that were barely used. I would go there at least 3 times a week and jerk off with my cock under the hand dryer. Something about the hot air made me super horny. I never got close to getting caught, but did get a hand job from a co-worker in there once.
don't try it with one of those new xlerator dryers. i suspect your skin might blow off, and the cumshot would probably end up denting the floor.
You should not talk about a person without letting them know you know something. I realize it is difficult to get personal but you need to either say something to them or say nothing to everyone.
I, too, would masturbate at the office when no one else was there -- the bathroom was close to my desk, and I was there alone quite a lot. Uncut, so no lube needed -- I would 'do it' almost every time I was there alone!