Some time ago Charing Cross station used to be full of guys cruising and beating off.
The best time I remember was when there was still a long trough to pee in. I went in and there were five other guys standing there, so I stood next to them and got my cock out. All of them were shamelessly wanking in full public view without a care. I got hard immediately and started to beat off.
It was so exciting with people going around past you and completely in public that I didn't last long and shot my load first.