An older commuter becomes obsessed with a woman he sees on the train each morning, apparently returning from the gym in a revealing sports bra that barely contains her shapely breasts and leaves her waist and navel exposed. Convincing himself that she wants his attention, he secretly applies a pleasure-enhancing drug and begins groping her. Her body squirms as her breasts shake, nipples harden, and pussy grows wet despite the crowded train. When she boards again the next day and no longer resists his touch, he takes it as permission to push her through another dizzying wave of public pleasure.