1girl, animal_ears, ass, ass_grab, ass_support, black_one-piece_swimsuit, breasts, brown_eyes, brown_hair, competition_swimsuit, embarrassed, from_behind, grabbing_own_ass, horse_ears, horse_girl, horse_tail, looking_at_viewer, looking_back, medium_breasts, medium_hair, multicolored_hair, nice_nature_(umamusume), one-piece_swimsuit, pataneet, racerback, simple_background, solo, streaked_hair, swimsuit, tail, tail_through_clothes, two-tone_swimsuit, umamusume, white_background