Nina's second lesson in submission is a harsh one. Frank Gun, her dominant trainer, pushes her limits with a brutal BDSM session. He disciplines her with a flogger, then forces her to put on a weighted clit clamp. When she's finally on her knees, he shoves his cock down her throat, making her gag and choke. Frank teaches her that pain and pleasure are intertwined, and that she must serve her master completely, no matter how humiliating or painful it may be.