The Nakanishi family is doing well, with their daughter getting married and adopting a son-in-law. While her husband and daughter are busy working, her son-in-law is busy playing games. Eriko is angry at her son-in-law for being lazy. He is trembling with anger, as he has been interrupted on his day off, and has not had a night with his wife for a while. Eriko tells her what she wants to say to her son-in-law and leaves. Her husband is away on a business trip, so she is sleeping alone in the bedroom. When she wakes up, she finds her son-in-law playing with her body. She tells him to stop, but he doesn't care and roughly squeezes her and strips her clothes. She resists, but she is no match for his strength, and is violated at his mercy. He forces her to have sex with him, makes her hold his hard cock in her mouth, and violently stirs up her insides. The son-in-law ejaculates and leaves the scene, but Eriko trembles for a while. One night, Eriko invited her husband to have sex. However, her husband was not very energetic, probably due to his age, and Eriko was not satisfied. Eriko hurried to the bathroom. She was masturbating secretly in the bathroom, with the sound of the shower echoing. Her son-in-law was peeking at Eriko's actions through the glass of the bathroom. The son-in-law, who had been watching Eriko masturbate, could no longer endure it, and embraced Eriko violently, and thrust his hardened penis into her...