In order to support my wife as her due date approaches, her mother-in-law, Marina, has moved to Tokyo from her parents' home. - Thanks to this, my family relationships are good... but I am told that I cannot allow myself to experience pleasure alone, and I am ordered to refrain from masturbation for the time being. - A few days later, while I was hiding in the bathroom and masturbating, Marina suddenly opened the door. - I was shaken by the sudden situation, but Marina-san, who knew the situation, seemed apologetic and asked if I could help. - He made me an unexpected proposal...