Reiko, a life insurance saleswoman who works door-to-door, accompanies Ichijo, the company president, on a business trip to secure a large contract. Although there is an agreement that nothing sexual will happen, as soon as they arrive at the inn, she is asked to provide sexual entertainment. She follows orders and licks and caresses him naked, performs deep throat service, and is immersed in rough, virile sex that is soaking wet with saliva, sweat, and love juices. In response to the perverted play, Reiko's whole body is dominated by pleasure and she becomes a masochist, and eventually she becomes addicted to the pleasure of sex that becomes a mess, and she continues to accept the cock until the sun rises...