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anthro archie_comics bisexual breasts butt chipmunk echidna eulipotyphlan female female/female genitals ground_squirrel group group_sex hedgehog julie-su knuckles_the_echidna male male/female mammal monochrome monotreme partner_swap penis rodent sally_acorn sciurid sega sex simple_background sonic_the_hedgehog sonic_the_hedgehog_(archie)sonic_the_hedgehog_(comics)sonic_the_hedgehog_(series)unknown_artist