Rule 34 Dev - 1girl animal_ears ball blue_one-piece_swimsuit bow brown_eyes brown_hair ear_ribbon exercise_ball highres horse_ears horse_girl horse_tail kneeling leaning_forward long_hair mayano_top_gun_(umamusume) one-piece_swimsuit saeki_tatsuya school_swimsuit smile solo swimsuit tail two_side_up umamusume|13710941595