This happened when I was about 18 and really horny all the time. So I was in a public toilet and all of a sudden realised nobody else was there and I got a rush thinking about what it would be like to jerk off in public. It's something I fantasised about very often and I finally had my chance to try it. First I double checked nobody was around then I took off all my clothes and opened the stall door.
Exposing myself like this made my penis rock hard in an instant and I wrapped my hand around it and started stroking really fast. I took my other hand and rubbed my body all over while slowly walking outside the stall. I sat in the middle of the room with my legs wide open just pumping away hoping someone would catch me and hopefully join in if I was lucky. At this point I was talking dirty to myself still rubbing my body all over so I got on my knees with my butt facing the door to finish myself off. Moaning out loud I came furiously huddled over a little drain where all my cum went into. After I came in the drain I spanked myself a little for being so naughty then put my clothes on and left.