To fulfill a son's request for incest, Shinya Karagi devises a plan. The son, who has developed romantic feelings for his stepmother—his father's new wife of one year—secretly hires Karagi, disguised as a company president, to seduce her. The stepmother pretends reluctance as she secretly offers her body, yet moans uncontrollably. After relentless foreplay brings her to climax, she accepts his cock, her face melting in ecstasy. Once blindfolded, the son, impersonating a friend, joins in, escalating the encounter into a threesome. As her son's cock thrusts into her, she simultaneously sucks the other man's shaft, performing an intense blowjob.