The metro's anonymity fuels their lust. The cop, his badge hidden, unzips, freeing his throbbing erection. The woman, her panties discarded, straddles him, impaling herself on his throbbing length. The train lurches, causing them to grind together, their moans muted by the city's roar outside. They fuck with urgency, their bodies slick with sweat, their eyes locked, daring each other to break first. As they reach their peak, the train screeches to a halt at their stop, forcing them apart, leaving them breathless and wanting more.