Even after so many years, Koji is still in love with Chisato, but lately, he has not been able to get an erection and is starting to get anxious. He buys some very potent aphrodisiac drinks but carelessly leaves them around in the house. And while he was away, Chisato and his son accidentally drank them up. The thing worked all too well, and by the time the hubby returns to the house, he discovers a savage scene of creampie and incest.