Her husband is busy with work and has little time for Mao. Mao, a busty gal wife in the prime of her life, enjoys teasing her father-in-law who lives with her every day. One day, Mao gets a call from her husband saying that he will be late at work, and she takes the plunge. Her father-in-law takes the bait and becomes obsessed with her body, and begins to desire her every day. As a result of her continued relationships with two men, her husband and her father-in-law, a change finally occurs in Mao's body... What changes have occurred in Mao's body?