To help my wife as her due date approaches, her mother Marina comes to Tokyo from the family home. Everything seems harmonious until my wife declares that taking pleasure alone is unacceptable and bans me from masturbating. A few days later, I secretly jerk off in the bathroom, only for Marina to open the door unexpectedly. I am mortified, but after hearing the circumstances, an apologetic Marina makes an offer beyond my wildest hopes: “Would you like me to help?” That leads to repeated breeding sex with my mother-in-law...