Rule 34 Dev - 4boys animal_genitalia animal_penis anthro anus ass backsack balls comic countershade_face countershade_tail countershading dergum dergum_(dergum) equid equine equine_anus equine_genitalia equine_penis gay genitals group hi_res horse interspecies male male/male mammal medial_ring open_mouth penis perineum scalie tail zebra|9548387048