Koji is intrigued by the large breasts of Reiko, his father's new wife. Reiko's moderately ripe body is too much for a boy in the midst of puberty. Koji turns into a wild beast and sucks at her breasts. Reiko resists, but as he relentlessly sucks and licks her with his fierce tongue, her crotch heats up and her angry voice turns into a moan...