A long-married couple receives a mysterious package containing a chastity cage, which, when used, transports them to a sex dungeon.
The couple is confronted by a dominatrix and her assistants, who proceed to train them in BDSM practices, with the wife learning to dominate her husband.
The husband is subjected to relentless pegging and anal play, while the wife is trained to take over as his Mistress.
Themes of submission, power exchange, and sexual exploration are prevalent throughout the narrative.