One night, a subordinate summoned to his boss's house blackmails Rio, the boss's wife, using an AV she once appeared in, then assaults her while her husband sleeps. Finding pleasure in the act, the subordinate begins visiting the house daily, plotting to dominate Rio completely. Rio is bound in a spread-eagle position and tormented with vibrators, butt plugs, and electric massagers, enduring relentless deep-throat sessions and creampie sex. Each time, she sinks deeper into the depraved affair, becoming utterly addicted. However, everything is actually part of the boss's secret plan—he has been covertly watching his wife's vulnerable state, deriving sexual pleasure from it all along. Then one day, upon discovering the subordinate pleasuring his wife, the boss bursts in, consumed by jealousy...