Koji returns to his hometown and finds his brother and sister-in-law arguing over infertility treatment, leaving him bewildered. That night, he accidentally catches them in the act and can't take his eyes off his sister-in-law Riyo's lewd behavior. Desperate to get pregnant, Riyo agrees to keep the peeping a secret in exchange for Koji, who already has children, to ejaculate inside her. Hidden from the family, Riyo greedily enjoys his penis, sweating profusely, and her intense seduction makes it impossible for Koji to resist, ultimately leading him to ejaculate deep inside her vagina…
