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1987 animal_genitalia animal_penis anus balls canid canine canine_genitalia canine_penis dated duo erection felid feline_genitalia feline_penis feral fur genitals knot knot_root knotted_penis knotting low_res male male/male mammal oral oral_knotting oral_penetration pantherine penetration penis sheath simple_background sitting size_difference smile spread_legs spreading tail tongue tongue_out urbanhermit white_background