The bus lurches, its passengers swaying and rubbing against each other in the close quarters. One man, however, uses this to his advantage. His cock, rock hard and aching, presses against unsuspecting bodies, seeking friction. He's a 'pau duro' in action, a term used to describe the relentless, exposed hardness of his desire. The journey from CWB to SP is his personal porno, a public display of his unyielding erection.