JUQ880 — I Secretly Slip It Straight into My Careless, Unemployed Sister-in-Law Whenever She Stays at Her Parents' Home

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Shinji lives with his wife and mother-in-law in their family home. Their peaceful routine ends when his nearly 30-year-old sister-in-law Tsumugi Akari moves back after fighting with her husband. She leaves the house a mess, and Shinji's wife refuses sex because Tsumugi might notice, leaving him increasingly frustrated. One day he catches his lazy sister-in-law masturbating and, despite his irritation, becomes intensely aroused. Unable to hold back, he asks Tsumugi to get him off—and her unexpected answer opens the door to a secret sexual arrangement behind his wife's back.