Rule 34 Dev - 2018 anus balls black_anus black_balls black_mane black_markings black_tail dated equid equine equine_anus feral fur genitals glistening glistening_eyes green_eyes horse male mammal mane markings mouth_closed rear_view rufciu side_view signature simple_background solo tail tan_body tan_fur tennesseestud white_markings|12667229016