After losing her husband, Sakura raised her daughter on her own. Her daughter grew up to be a fine young woman, got married, and came to live with her. One day, while they were living an ordinary but happy life, Sakura happened to peek at her daughter and her husband's nighttime activities and was shocked. Her adopted son-in-law, who was a gentle and earnest man, was making her daughter cum over and over again with his wild, intense hip thrusts. Seeing this brought back memories of her past as a sex addict and creampie slut, and she could no longer control her sexual desire...