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 couples activities, he couldnt take his eyes off his sister-in-law Rihos 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 Rihos vagina.