In the gritty, neon-lit world of Metro's "Stop My Ass Is On Fire," a full movie unravels, igniting a blaze of raw, uninhibited passion. The unnamed protagonist, a rugged, tattooed man, finds himself in a steamy, public encounter with a mysterious woman, her ass ablaze with desire. In the confined space of a subway car, they indulge in a taboo tryst, her ass clenching and unclenching in anticipation.