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A lone man on a bustling train, his bladder full, decides he can't wait for a stop. Discreetly, he slips into the tiny toilet, pulling the door shut. He unzips, sighing in relief as he starts to piss. But his body has other ideas; his cock twitches, hardening at the thrill of the public risk. He looks around, paranoid yet excited, and starts to wank, his strokes quick and urgent. The train rumbles on, oblivious to his secret pleasure.