The doctor's gloves snap on, her eyes locked onto the patient's trembling buttocks. She spreads the cheeks, revealing the tiny, clenched hole she's about to violate. "Deep breaths," she coaches, pressing a slippery digit against the resisting ring. With a firm push, her finger pops in, drawing a gasp from the patient. The doctor begins to fuck her anally, twisting and curling her finger, searching for that sweet spot. The patient's moans grow louder, her body tensing and relaxing in rhythm with the doctor's thrusts. The doctor adds another finger, stretching the patient's ass, preparing it for the real invasion to come.