Mio's visit to her sister coincides with her husband's business trip, so she and her husband end up staying at her brother-in-law's house for a few days. Unfortunately, her brother-in-law also has a cold and is bedridden. In return for the care, she nurses him back to health, and his sexual desires build up, and he becomes sexually aroused and his wicked feelings grow stronger as he approaches Mio. Mio promises him that he won't penetrate her, and when she gives in to him halfway, Mio is overcome by pleasure and inserts himself, shaking her hips. This awakens her sexual desire, and Mio is unable to refuse her husband's advances, becoming immersed in pleasure.