In 'The Submission of Sophie,' Bound Heat explores the dark allure of lesbian BDSM. Sophie, a blonde, submissive ingénue, is bound and presented to her mistress, a dominant Euro woman. The mistress, wielding a cruel whip, sets about training Sophie in the art of submission. She flogs Sophie's pale flesh, leaving it flushed and marked, as the young woman's cries fill the air. Yet, as the sessions progress, Sophie's cries transform, betraying her growing arousal. She learns to embrace her submissive nature, eventually graduating to become a mistress in her own right, ready to wield the whip and command her own slaves.