A highly detailed photorealistic scene on a tropical beach with fine white sand. A beautiful young woman is completely naked, straddling and riding a tall, muscular dark-skinned man in cowgirl position. She has long, wet, tousled light brown hair with golden highlights that clings to her face, shoulders and back. Her skin is sun-kissed, glowing and slightly tanned, covered in fine wet sand and water droplets that glisten across her breasts, stomach, ass and thighs. She has a slender yet soft body with a flat toned stomach, full natural breasts with hard pink nipples bouncing slightly, and a round firm ass. Her head is tilted back, mouth open as she moans in pleasure, eyes half-closed in ecstasy. The dark-skinned man lies on his back on the sand beneath her, completely naked, his large thick cock fully buried deep inside her. His strong hands grip her hips as she rides him. The background shows a calm turquoise ocean meeting a clear blue sky under bright natural daylight. Extremely detailed skin textures, realistic wet skin, sand particles, visible penetration, natural anatomy, sweat and sand mixed on their bodies, cinematic lighting, sharp focus, 8k, photorealistic, explicit adult photography style.