masterpiece, best quality, ultra-detailed, beautiful anime illustration, anime desire illustrious style, 25-year-old extremely skinny anime girl with a fragile, almost anorexic body, visible ribs, tiny waist, delicate limbs, yet having massive heavy natural breasts that look exaggerated and huge on her slim frame, long messy red hair, completely naked, lying on her back on a gym floor, legs spread extremely wide, intensely fisting her own hairy pussy, fist buried deep inside, powerful stretching, wet shiny pussy juices, glistening thick oil covering her entire body, shiny highlights on skin and massive breasts, overwhelming ahegao expression, mouth wide open, eyes rolled back, tongue out, body trembling in ecstasy, empty gym background with weights, dramatic anime lighting with strong highlights and shadows, (highly detailed face and eyes:1.3), (massive heavy breasts:1.4), (extreme skinniness and visible bones:1.25), (intense deep fisting and stretched hairy pussy:1.45), (glossy oil on skin:1.35)