The Tsukadas have been married for five years. However, their relationship is not as hot as it used to be... but Shiori's husband doesn't hold her when she wants him, so she releases her sexual desires by masturbating. But her husband makes a mistake that causes losses for the company, and Shiori is in danger of being fired. In order to avoid being fired, her husband tells her to entertain the president, and against her will, she gives him a blowjob. However, her heart pounding at the sight of a cock for the first time in a long time doesn't stop, and gradually the pleasure turns to pleasure. The next day, the president comes again, and her husband's firing is over, but he asks her to have sex... but... her body honestly craves a cock, and she allows him to cum inside her. Amidst the sense of guilt and excitement... Shiori succumbs to her desires and pleasure and becomes a female...