Saki Mizumi and her husband decide to let her husband's boss stay overnight after he helps take care of her drunken spouse. The husband, heavily intoxicated, forces his wife to give him oral sex, thinking the boss won't find out. The next day, the boss heads to work with her husband but separates under the pretense of a detour and returns to the Mizumi residence. Recalling the previous night's incident, the boss makes a move on Mrs. Mizumi. Embarrassed yet yielding, she gives in just once—but soon finds herself repeatedly brought to climax by the boss's powerful cock, becoming hopelessly addicted. Even with her husband nearby, her mind remains consumed by the affair with her dominant superior.