A stern dominatrix ties up her submissive, suspending him by his wrists in a dimly lit dungeon. She teases him relentlessly with a riding crop, striking his flesh and leaving red welts. The submissive groans in pleasure-pain as his mistress commands him to maintain an excruciatingly hard erection. She brings him to the brink of orgasm, only to deny him release, again and again, as part of his rigorous training in self-control and denial.