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2013 5:6 abs abstract_background animal_genitalia anthro athletic balls biceps big_muscles big_penis biped black_body black_fur black_nipples black_nose black_penis black_sclera bodily_fluids canid canine canis chest_tuft claws cum erection fangs fur genital_fluids genitals grey_body grey_fur grin heterochromia holding_knot holding_own_knot holding_own_penis holding_penis knot leaking licking licking_lips licking_own_lips looking_at_viewer male mammal muscular muscular_anthro muscular_male nipples nude pecs penis pose precum presenting red_eyes rrowdybeast self_lick sheath simple_background sitting smile solo spread_legs spreading teeth thick_penis tongue tongue_out tuft vein wolf