One night and two days of 1 night and left alone by my wife's sister who suddenly came over

While his wife was on a two-day trip with a friend, Kenji enjoyed living alone using his secret AV material he had hidden. However, he suddenly leapt up at freedom for the first time in a while and accidentally forgot to lock the front door. Then, my sister-in-law Reiko came to visit me, wrong timing. Reiko, suspiciously, looks at the open locked entrance, enters her house looking for Kenji... and runs into Kenji, who is masturbating in a selfish way...