Rule 34 Dev - 1:1 anthro blue_body blue_fur duo echidna eulipotyphlan fur genitals hedgehog knuckles_the_echidna male male/male male_only male_penetrating mammal monotreme muscular muscular_male penetration penis red_body red_fur sex sonic_(series) sonic_the_hedgehog sonic_the_hedgehog_(series) terrykurosu|4035379056