Yumi's husband is working away from home, and she is leading a boring life. To kill time, she goes out drinking with Kuroi, a colleague from her part-time job. His strong body reminds her of her womanly desires, and she cannot help but start a time-limited affair. Even at work, Yumi and Kuroi repeatedly commit adultery during their breaks, devouring pleasure. Both of them are Kokoro by the intense pleasure they feel in their limited time. Before she knew it, Yumi could not do without a young cock, and she is having sex with him all day, anywhere.