I masturbated in the men's room of the subway station.
It was around 10pm on a weekday, I was feeling really horny and like 5 people, including me, were waiting the train, everyone minding their own business, so I stood near the restroom and saw no one inside so I sneaked in and entered a stall, I sat on the toilet and started rubbing myself over my panties for a couple of minutes, then I heard someone entering and I raised my feet quickly, cause I was wearing my catholic high school's uniform, which is a jumper, white socks, and brown saddle shoes, so if he'd have saw them I'd have been found out, and then I heard him peeing, I got even more horny and slide a finger in, another guy entered and I started fingering me with three fingers, I was being really careful not to make noises but when I was reaching my climax a moan escaped just in time when one of the guys turned on the dryer, I squirted and panicked, thankfully, the restroom was empty, I waited a couple of minutes to be sure that no one was there, then I exited the stall, when I was washing my hands a middle aged man in a suit entered and I just said "sorry, it was an emergency" and ran off with my face red and burning.