Oki was staying overnight at his boss's request, busy organizing work documents. In the middle of the night, he suddenly woke up and secretly witnessed his boss and his wife engaging in an SM session. The next morning, while the wife, Ryouko, was preparing breakfast, her large sweater revealed her chest tightly bound with hemp rope. Drawn to the visibly shaken Oki, Ryouko leaned close, pleading for him to dominate and punish her. Hesitant at first, Oki gradually began training and dominating her.