Hazel Moore, the possessive stepsister, finds herself in an unusual therapy session with her stepbrother Charlie Forde and psychologist Nick Strokes. Hazel, determined to maintain control, manipulates the situation, turning it into a sexually charged threesome. She seductively discusses her 'issues' with Nick, using his professional boundaries to her advantage. Charlie, initially hesitant, is drawn in by Hazel's taboo allure. The doctor, despite his best intentions, finds himself enmeshed in their twisted dynamic, leading to an intense, forbidden encounter.