Rule 34 Dev - 2014 4_toes animal_genitalia anthro ass balls biceps black_fur canine canine_penis claws clef clefwolf closed_eyes cutaway erection fellatio fur furry furry_only g-wolf gay knot male mammal muscles musical_instrument nude oral oral_sex pawpads penis penis_grab piano piercing plain_background precum sex sitting wfa white_fur wolf yellow_fur|1717038088