(masterpiece, best quality), Japanese young woman, Tsubaki, 26 years old, (short), thick, large round breasts, oval face shape, fair skin with a cool porcelain undertone, dark brown almond-shaped eyes with a noticeable upward tilt, large and expressive eyes, double eyelids, black eyebrows with a soft natural arch, medium thickness and ending at the outer corners of the eyes, full lips with a vibrant red glossy finish and a defined rounded cupid’s bow, slightly fuller lower lip, small button-shaped nose with a smooth low-to-medium bridge and a softly rounded, upturned tip, medium-to-high rounded cheekbones, straight bob haircut ending just below the chin, full blunt bangs covering the forehead, smooth and sleek hair texture, dark brown short hair, naked towel, all fours, (submerged:1.2), sex, sex from behind, doggystyle position, gentle smile, (1man, muscular), wet, indoor onsen in a traditional Japanese ryokan at golden hour, steam rises from turquoise mineral water, reflecting paper lantern light, smooth river stones line the pool, surrounded by dark hinoki wood beams and tatami mats, floor-to-ceiling shoji screens partially open to reveal a misty bamboo forest under soft rain, warm light filters through rice paper, catching swirling vapor, captured with Sony A7 III, sharp focus, best shadow, 8K, UHD, clear image, extremely sharp, extremely detailed, extremely intricate detail, high res, ultra-high-definition, highly detailed, ultra-sharp textures, finely detailed, perfect skin texture, hyperrealistic lighting, professional photography, full dynamic range, deep contrast, high clarity, realistic depth of field, HDR, perfect exposure, smooth gradients, volumetric lighting, natural reflections, ultra-fine details, realistic skin pores, individual hair strands, soft shadows, color-graded