Meguri and her husband have been trying unsuccessfully to conceive, but his obsession with having a child has reduced their sex to dull, mechanical sessions. Frustrated and unfulfilled, she masturbates in secret—until the father-in-law who moved in a year ago catches her. Sensing her pent-up desire, he creeps up behind her while she is touching herself and attacks, beginning a forbidden routine in which he ejaculates inside her after her husband’s baby-making sex.