Big-breasted college student Shinobu is invited to her beloved professor's villa, only to find herself met with bondage and training. When the professor's huge cock is brutally thrust into her tight pussy, she moans like a kitten, forced into creampie sex even as she orgasms repeatedly. Spread into a wide M shape, she's subjected to relentless waves of stimulation from electric vibrators and dildos, her body trembling uncontrollably. Late at night, just as she begins to sleep, she's suddenly attacked and forced into titty fucking. Deep in her heart, she is completely broken in and trained—through this entire series of acts, she becomes utterly dominated by the professor, unable to ever return to who she once was.