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5:4 accessory ambiguous_penetration anthro anthro_on_anthro black_nose cylent_nite duo echidna eulipotyphlan eyes_closed female female_penetrated hair headband hedgehog male male/female male_penetrating male_penetrating_female mammal monotreme nude orange_hair penetration sega sex shadow_the_hedgehog sonic_adventure sonic_the_hedgehog_(series)tikal_the_echidna