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1:1 2020 abs anthro canid canine canis clothes_on_floor clothing domestic_dog duo eyes_closed fangs flaccid genitals grin kuro_(nomifuki)lying lying_on_ground male male/male mammal muscular muscular_anthro muscular_male nipples nomifuki nude on_back on_ground pecs penis pubes sharp_teeth shiro_(nomifuki)smile standing teeth underwear vein veiny_penis wolf