Rule 34 Dev - 1:1 anal animal_genitalia animal_penis anthro anus balls canid canine canine_genitalia canine_penis duo genitals hi_res knot looking_at_viewer looking_back looking_back_at_viewer low-angle_view male male/male mammal muscular open_mouth pawpads penis perineum rear_view smile tongue tongue_out zwolf|11400905656