realistic, solo nude athletic brunette woman lying on her back with knees bent and feet flat on the bed for stability, smooth 5-second loop of thrusting a large realistic dildo into her vagina with deep visible penetration and natural fluid motion, detailed motion with inward/upward angled thrusts targeting the front vaginal wall, viewed from front at a low angle slightly above her pelvis to emphasize the insertion point and hip movements, her head and upper body oriented away from the viewer, (toward the top of the frame), legs spread wide with knees pointing outward and thighs framing the central action, hands gripping the dildo base directed toward her body core, dimly lit bedroom background, 8K, best quality