Under the flickering lights of the metro, a stranger in a suit approaches a lone woman, his intentions clear. He guides her to a secluded corner, her back against the cold tile wall. His hands explore her curves, moving southwards to lift her skirt, revealing her bare ass. He spits on his hand, rubbing the saliva into her tight pucker, teasing her with his fingers. She moans softly, biting her lip to keep quiet. He unzips his trousers, revealing his throbbing cock, and without warning, pushes it into her ass, fucking her hard and fast as trains rattle past, oblivious to their illicit encounter.