rio (lio yuzu), mejiro ardan (umamusume), trainer (umamusume), umamusume, highres, 1boy, 1girl, animal ears, bare arms, bare shoulders, black hair, blue hair, blush, braid, breasts, cleavage, closed mouth, crown braid, horse ears, horse girl, huge breasts, long hair, looking at viewer, muscular, muscular male, naked towel, onsen, partially submerged, purple eyes, short hair, sidelocks, smile, towel, wet