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Koji, who lives with his brother and his wife, happens to see his sister-in-law changing clothes. The plump buttocks and heavy big breasts of Chisato, the brother-in-law who is burned into the eyes of his brother-in-law, make him a prisoner and annoy him. Koji, who can no longer endure his forbidden desires, steals Chisato's underwear and indulges in masturbation, but Chisato finds the scene. At that time, Chisato...