Mako has been married for four years, but because her husband is older, she hasn't been intimate with him for a long time. Every day, Mako has to secretly masturbate to soothe her growing desire. One day, her husband brought Takahashi, a subordinate of his, home because he missed the last train and suggested he stay overnight. At their first meeting, Takahashi was attracted to Mako's beauty and voluptuous figure. When she finished bathing and changing, Takahashi accidentally passed by and was drawn to her stunning body! Women's intuition is very sharp, and Mako knew she was being watched, but she wanted to tease this naive boy. Mako intentionally made seductive moves to arouse Takahashi. And that night, while Mako was asleep, Takahashi sneaked under the covers and had sex with her! At first, Mako resisted, but the mixture of pleasure and excitement made her ecstatic. And their illicit relationship began from there. Even though her subordinate was having an affair right next to her husband, Mako still loved him deeply...