The metro's fluorescent lights flicker, casting eerie shadows on the faces of the three teenage girls huddled together in their compartment. Their bodies press together, a dance of hormones and desperation. One of them, her eyes wild with curiosity, reaches out to stroke the others' thighs, her fingers inching closer to their centers. The train lurches, and they stumble, their bodies grinding together. A moan escapes one of them, and they freeze, listening for any signs of discovery. But the train rattles on, and they continue, their hands growing bolder, their touches more insistent, until the train screeches to a halt at their stop, and they reluctantly pull away, their hearts racing, their bodies yearning for more.