FNS-110 A Big-Titted Girlfriend Who Fucks Her Boyfriend Five Days a Week, and Gets Trained into a Lust-Crazed Sex Maniac by Her Boyfriend's Brother the Remaining Two Days - Hachimitsu Rin

The film follows a girlfriend with enviable massive breasts who enjoys sweet sex with her boyfriend five days a week, while the remaining two days she is secretly trained by her boyfriend's brother, gradually transforming her into a desire-obsessed fiend. Through a series of intense training scenes, the story depicts her transformation from passive to proactive, filled with NTR elements, training sequences, and multi-partner climaxes, ultimately leading to her complete surrender to carnal lust, unable to extricate herself.