Chisato has been trying to approach her husband for sex, but has been turned down a lot recently. Frustrated, she has no choice but to repeatedly masturbate, leading an unfulfilled life. One day, she is hired as a private tutor and ends up tutoring the son of her husband's colleague. The young man's penis becomes erect, stimulated by Chisato's sweet scent and the sight of her large breasts pressed against him defenselessly. When Chisato finds out, she starts taking off her clothes and guides his hands to her breasts...