Shiho, who started working as an office worker at the same general apparel company as her husband to repay her mortgage. She joined as a part-timer, but was selected for the project team for "underwear for older women." There she met Odagiri, the general planning section chief who is known as the company's ace. One day, while Odagiri was having a meeting with only the two of them, he was captivated by Shiho's fleshy ass. Odagiri makes Shiho wear the prototype underwear and persistently kneads her ass. Odagiri, who felt excitement, escalates more and more, and performs intense handjob with the underwear pushed to the side. Shiho, guided by Odagiri, fills her mouth with his hard dick, and when she is piston-fucked on all fours, she can't stand it and moans loudly. Shiho, who cannot refuse the pleasure from Odagiri that is repeated, finally accepts even the forbidden creampie sex. A secret office affair work of a married woman working at the same company as her husband.