The Metro's fluorescent lights flicker, casting eerie shadows on the faces of the commuters. A mysterious figure stands apart, hand moving rhythmically under their coat. They catch your eye, a smirk playing on their lips. The train slows to a halt, and in the momentary stillness, their hand emerges, glistening with evidence of their sinful pleasure. The doors slide open, swallowing them whole, leaving you craving more of their secret, underground debauchery.