Koji is puzzled when he returns to his parents' house for Bon Festival, as his older brother and his wife are arguing over fertility treatment. That night, when he happened to take a peek at the couple's activities, he couldn't take his eyes off his sister-in-law Riho's indecent foolery. She wants to get pregnant no matter what. Instead of keeping her peeping secret, Riho begs Koji, who has a girlfriend, to give her a vaginal cum shot. Koji is swept away by the fierce invitation of his sister-in-law who secretly hides in his family and secretly devours a meat stick, and Koji ejaculates in the back of Riho's vagina.
