animal_genitalia animal_penis anthro anus balls bara barazoku barn big_ass big_balls big_penis black_body black_skin butt equine_genitalia equine_penis flared_penis gaping gaping_anus genitals hay hooves horn looking_at_viewer looking_back lying lying_down male medial_ring muscular muscular_anthro muscular_male on_side penis penis_tuck presenting rear_view solo vein veiny_penis rulethony34tano_(director) bovid bovine cattle mammal tail