Strangers on a late-night metro, eyes locking in the dim light, they silently agree. A quick glance around confirms their privacy. He stands, unzipping, exposing his rock-hard cock. She licks her lips, eager to please, dropping to her knees, the train's motion rocking them gently. Her mouth envelops him, her tongue swirling, as he grunts softly, hands cupping her head. Meanwhile, she hikes up her skirt, revealing her dripping pussy, fingers playing, teasing. The train screeches to a halt, they pause, hearts pounding, then resume, hungry, insatiable.