The Moritaka household became a one-man household after her mother-in-law grew tired of her and left. Kasumi, the second son's wife, recently began living with her. Her father-in-law squandered her inheritance, while her eldest son wandered around without a steady job. Living together had also caused some strain in her relationship with her husband. Meanwhile, Kasumi felt her father-in-law's lewd gaze. One day, while alone with her father-in-law, she was busy with housework when he suddenly fondled her lower body. Her resistance was futile, but her father's characteristically sticky, relentless thrusts and his rock-hard cock, belying his age, gave Kasumi a sense of fulfillment she had never experienced with her husband. Her father-in-law's sexual appetite was intense, and Kasumi, who hadn't had a sexual relationship with her husband, began to accept him. After sending her husband off to work, Kasumi gave in to her father-in-law's desires and had sex with him, but her eldest son saw her doing so and she ended up having sex with him too.