Four pairs of sons with F-cup breasts or larger who have abstained from masturbation for a month compete in a tournament to see who can ejaculate the most in the ring, with a prize of 1 million yen in New Year's money! They attack with their proud breasts in a titty fuck, and use a rope to shake their hips in a cowgirl position! Thick sperm overflows from the pussy, and pregnancy is guaranteed! The new year comes in the middle of sex, and they cum continuously until the morning, and it's a first time with their beloved mother!