The city's rhythm pulsates through him as he leans against the wall, his heart pounding in sync with the traffic's hum. His hand, hidden in his coat pocket, grips his throbbing cock, fingers moving in steady, practiced rhythm. The risk of being caught only heightens his arousal, his breath misting in the chilly air. With a final, desperate stroke, he comes undone, his cum painting the wall, a secret message in the city's vast, indifferent canvas.