JUQ-880 My sister-in-law, a NEET in her 30s, has returned to her parents’ house and is now spending all her time there, so I’m letting her have sex with me without my wife knowing.

Shinji lives with his parents-in-law after marrying into the family. He is living a peaceful life with his wife and mother-in-law when his sister-in-law Tsumugi, who had a fight with her husband, comes to stay with them...? The house is a mess because of his lazy sister-in-law. On top of that, he is frustrated because he is refused sex with his wife because "my sister-in-law will find out." One day, he witnesses Tsumugi masturbating and becomes aroused by his lazy sister-in-law, who should have been irritating him. Unable to bear it any longer, Shinji asks Tsumugi to give him a handjob, but Tsumugi's response is unexpected...