"You ... I'm sorry" I'm always held by my father-in-law for 15 minutes while my husband is taking a bath. Minami Kojima

Xiaonan is a married woman whose husband often leaves her alone with her father-in-law while he takes a bath. Her father-in-law takes advantage of these situations to engage in a taboo incestuous relationship with her, specifically an creampie act. As the story unfolds, it becomes clear that Xiaonan is uncomfortable with this situation, but her father-in-law persists, driven by his own desires.