A female teacher bound by a naked promise with the vice-principal. Forced into a relationship under threat of punishment, she is initially violated against her will, tormented all over her body and driven to repeated orgasms. Gradually, however, her aggressive side emerges, and she can no longer suppress her own desires. Using both her mouth and pussy, she swallows the man completely, repeatedly taking him deep in cowgirl position and tight, cramped poses. Drenched in sweat and overwhelmed by sensation, she appears utterly dominated. Yet after demanding "Give me your cum in my mouth," she gulps down the vice-principal's semen in one go, then immediately resumes sucking the tip of his cock. Moaning "I want more sperm," she devours him entirely, revealing her true nature as a sex-crazed serpent woman. Her transformation and insatiable passion deepen their twisted relationship further.