His son's wife seems chaste and pure... However, the father-in-law accidentally finds out that it's all a deception and that she's actually quite the slut. The father-in-law loses all sense of reason and seduces him, and from that day onwards, they begin a passionate affair every day. The wife, who has forgotten her devotion to her husband, becomes obscenely devoted to her rendezvous with her father-in-law, going crazy with pleasure...