STARS-706 I was just letting my wife's sister stay overnight after she missed the last train... The stress I had accumulated from not having sex exploded, and I forced myself to have sex with her until the morning. Yura Kudo

After graduating from university, Yura gets a job at a company and ends up having so much fun going to a drinking party that she misses the last train. I happened to know that my sister's house was nearby, so I called her and asked her to stay the night. However...my sister and her husband are both working and seem to be busy lately, so they haven't had sex. The husband is in a state of frustration... and is lustful at Yura's defenseless appearance. Without asking any questions, I attacked my wife without her knowing...