Though it's her day off, Shizuka visits her husband's boss, trembling with loneliness. Her husband can't bring himself to turn her away, so the two start making out in front of his superior. Her husband's cock hardens, and he slips it into Shizuka's mouth when the boss isn't looking. Shizuka nervously takes her husband's penis deep into her mouth, overwhelmed by a mix of thrill and filth. Watching from the shadows, the boss seizes the moment when Shizuka's husband leaves for shopping and aggressively caresses her body. Shizuka, feeling the touch of an older man so different from her husband, experiences an unfamiliar pleasure and ends up accepting the boss's rock-hard cock. From then on, she secretly masturbates with the boss over the phone while hiding it from her husband. Shizuka's body gradually comes under the boss's control, and while her drunken husband sleeps, she gets taken from behind, the boss's fully erect cock thrust deep inside her. Married woman Shizuka is passionately claimed by her husband's superior, surrendering herself completely to the ecstasy even as she loses her mind.