"If you've never seen a girl naked, why don't you see your mother?" Worried about her son's lack of interest in sex, Yurine shows him her breasts as a form of sexual education. However, Yurine's careless actions cause her son's hidden obsession with his mother to explode! "You'll have to be naked..." The son goes wild while his father is away on a business trip, restraining Yurine's limbs and bringing her to orgasm countless times. Gradually, his reason breaks down...