Tsubaki is having an affair with her married boss. She pressures him with questions—whether he can stay the night, whether he prefers her to his wife, and whether her blowjobs are better—while he dodges the truth and keeps her hooked as a convenient sex partner. When he visits her home after work, she kisses him at the door and they have passionate sex wherever desire takes them. Later, a traveling masseur arrives as a supposed surprise gift. Her boss lets the masseur touch her as he pleases, then grows jealous and humiliates Tsubaki for responding to it. Once the masseur leaves, he puts a collar on her and punishes her. Their evening spirals through adultery, jealousy, consensual partner-sharing fantasy, and domination.