On a crowded Mexico City bus, a busty Mexican woman, her dark eyes hidden behind sunglasses, begins to subtly pleasure herself. Her hand creeps beneath her skirt, fingers rubbing her wet pussy as she pretends to read a book. Her exhibitionist desires grow, and she gradually exposes more flesh, her massive breasts threatening to spill from her low-cut top. Passengers steal glances, some trying to hide their arousal, others blatantly staring at her glistening fingers and the promise of more.