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2013 abs animal_genitalia animal_penis anthro armband athletic balls barefoot biceps big_penis biped black_hair black_nipples black_penis bridle brown_eyes equid equine equine_genitalia equine_penis fasttrack37d feet fist fur gate genitals grass grey_body grey_fur hair half-erect hooves horse long_hair male mammal muscular muscular_anthro navel nipples nude pecs penis plant pose presenting public running ryan_(lostcat461)sheath solo standing teeth vein