(masterpiece, best quality, ultra-detailed, photorealistic, cinematic shot), (underwater in a pool), an explicit underwater scene of a man and a woman engaged in sexual intercourse. A voluptuous, busty caucasian woman with very large, buoyant, natural breasts, large pinkish-brown areolas, and prominent nipples is floating on her back. Her long brown hair flows freely in the turquoise water. Her head is tilted back with her eyes closed and mouth slightly open in an expression of pure ecstasy, Her body is completely nude, pale skin glowing in the diffuse underwater light. A muscular, nude caucasian man is behind her, holding her legs open by gripping her thighs. He is penetrating her from behind as she arches her back towards him. The scene is set in a clear pool The underwater lighting is ethereal and soft, highlighting the contours of their naked bodies. The water is deep and clear but has a slight murkiness, adding to the dreamlike atmosphere. The surface of the water is not visible, ((deep underwater:1.6)), The focus is on the raw, sensual moment of their underwater copulation.