Mayu Benishiro, introduced by an acquaintance, begins working as a private tutor for a wealthy family. The interview goes smoothly and she is hired, leaving her overjoyed—until the household's master becomes captivated by her big tits and voluptuous body, gradually pulling her into a sexual relationship. Mayu, harboring secret desires and a taste for humiliation, finds herself not only at the mercy of the master but also targeted by the son, her student. Soon, she is tied up, dominated, and thrust into a world of titty fuck, BDSM, and intense sexual servitude far beyond anything she imagined.