Karin returns with her husband to his childhood home, where her widowed father-in-law lives alone, to visit her mother-in-law’s grave. That night, sex with her husband ends before she is satisfied, and her father-in-law secretly watches her masturbate. The next day, after the grave visit, her husband goes out. Her father-in-law approaches and whispers, “My son can’t satisfy you, can he?” Karin initially resists in confusion and shame, but her body gradually heats up and her self-control slips away. Each time he takes her, guilt and pleasure pull her deeper into a forbidden affair from which she can no longer return.