In the grimy, fluorescent-lit interior of the metro, a woman's head bobs rhythmically in a man's lap. Her lush, crimson lips stretch around his thick cock, taking it deep into her throat. The man's hand grips her hair, guiding her movements as she sucks him off with gusto. The train car is filled with the wet, slurping sounds of her oral ministrations, the smell of sex heavy in the air. Around them, commuters avert their eyes, but the scene is impossible to ignore, a raw, public display of lust in the heart of the city.