Grigio from Ultraman R/B, female, young woman, completely naked, pink and white skin tone, small firm breasts, slim waist, wide hips, long light brown hair in twin tails, lying on bed in her human form room, legs spread wide open, knees bent, feet in white socks, one hand touching her small breast, pinching nipple gently, other hand between thighs, fingers rubbing herself, head tilted to side, eyes closed, mouth slightly open, flushed pink cheeks, sweat on forehead, pink uniform crumpled on floor beside bed, bedroom background with posters on walls, soft warm lighting from window, intimate close-up shot, photorealistic, extreme detailed skin texture, soft skin with slight shine, moisture on skin, 8k resolution, cinematic lighting, masterpiece, best quality.