Rule 34 Dev - 1girl animal_ears argyle bare_shoulders blush breasts collarbone competition_school_swimsuit hair_ornament half_updo highres horse_ears horse_girl large_breasts long_hair looking_at_viewer multicolored_hair open_mouth rikki satono_diamond_(umamusume) school_swimsuit sitting swimsuit umamusume wariza yellow_eyes|15322147542