Rule 34 Dev - 16:9 anatomically_correct anatomically_correct_genitalia anatomically_correct_penis animal_genitalia animal_penis balls black_mane bridle brown_belt cloud day detailed_background dirt equid equine equine_penis erection feral flared_penis fur genitals grass grey_body grey_fur heiken hooves horse horsecock huge_flare looking_ahead low-angle_view male male_only mammal mane mountain nawka outside penis quadruped shaded shadow sky solo wooden_fence|4011685672