ohko no naisho, daiwa scarlet (umamusume), umamusume, 1girl, animal ears, blue one-piece swimsuit, blush, breasts, brown hair, cleavage, fang, hair ornament, hand on own hip, horse ears, horse girl, horse tail, huge breasts, index finger raised, leaning forward, long hair, long twintails, one-piece swimsuit, open mouth, red eyes, smile, solo, standing, swimsuit, tail, tiara, twintails, white background