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2016 abs animal_genitalia animal_penis anthro anthro_on_anthro armpit_hair artist_collaboration balls biceps big_penis black_body black_fur body_hair brown_body brown_fur brown_hair canid canine canine_genitalia canine_penis canis duo erection frottage fur genitals green_eyes hair knot male male/male mammal muscular nipples nude pecs penile penis penises_touching purple_nipples sex sheath simple_background smile tail wolf wolfblade yamato_iouko yamatoiouko yellow_eyes zaos_(artist)