A shared house where three sets of mothers and sons engage in forbidden copulation completely nude. A prize of 1 million yen is awarded to the longest-lasting mother and son duo living together 24/7. Their private parts are continuously engaged, even during cooking, cleaning, laundry, and bathing! Even if they lose control, they immediately engage again! Over long periods of continuous engagement, they gradually become like lovers... Frequent unprotected sex in the living room and dining area!