1girl, air_groove_(umamusume), animal_ears, between_legs, bikini, blush, breasts, brown_hair, cowboy_shot, horse_ears, horse_girl, horse_tail, komb, large_breasts, looking_at_viewer, lying, mismatched_bikini, on_back, purple_eyes, short_hair, side-tie_bikini_bottom, solo, swimsuit, tail, tail_between_legs, umamusume