1girl, ahoge, animal_ears, armpits, bad_pixiv_id, black_hair, blush, breasts, cleavage, hair_ornament, horse_ears, horse_girl, horse_tail, itsukawa_kamieshi, kitasan_black_(umamusume), looking_at_viewer, medium_breasts, navel, open_mouth, playboy_bunny, red_background, red_eyes, solo, tail, thighhighs, umamusume