While staying over at his boss's house, he accidentally sees his boss and his wife, Yuri, engaging in SM... The next morning, Yuri is tied up underneath her clothes and seduces the man. "How was I yesterday?" she asks. "Being watched made me really excited," Yuri says. Unable to resist, the man embraces Yuri. A week later, the man is called to a suspicious store by his boss, where he trains Yuri again. Yuri's lustful body begs to be tied up and tortured...