Saki Hatsumi and her husband, unable to stay in their home during renovations, temporarily move in with her brother-in-law. Though meeting him for the first time, Saki becomes increasingly aware of his crotch, lost in fantasy after fantasy—until she accidentally runs into him naked in the bathroom and impulsively reaches for his cock. After experiencing aggressive blowjob sessions with him, Saki finds herself still unsatisfied even after creampie sex with her husband, and begins an intense incestuous affair with her brother-in-law whenever her husband is away. Filled with desire, she indulges in deep, forceful penetration from his huge dick, her pussy dripping with arousal as she surrenders her entire body to pleasure in this passionate, taboo encounter.