To support my wife, who is close to giving birth, my mother-in-law, Ichika, came to Tokyo from my wife's parents' house. Ichika-san, who looks like my wife's sister, is beautiful. There's a deep reason why I get an erection when I see such a mother-in-law. It was because I forced myself on my pregnant wife that I made my wife angry and was told not to masturbate. I was somehow enduring it, but the beautiful and enchanting Ichika-san doesn't know anything about that and is very close. Finally reaching the limit of my endurance, I secretly filmed Ichika-san's naked body while she was bathing. When I reached for my crotch in the bedroom, Ichika-san suddenly came into the room...