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4:3 anthro anthro_on_anthro beard canid canine canis claws domestic_dog duo erection facial_hair feet foot_fetish foot_lick foot_play genitals grin hi_res humanoid_genitalia humanoid_penis kangaroo licking macropod male male/male mammal marsupial monochrome muscular muscular_anthro muscular_male nude pawpads penis side_view size_difference sketch smile solaxe solaxe_(artist)tail toe_claws tongue