Rule 34 Dev - 2006 3boys anthro blue_fur double_anal echidna fur furry furry_only green_eyes hedgehog highres interspecies knuckles_the_echidna leostar male male_only mammal marc_leonhardt monotreme multiple_males no_humans penis sega sex sonic_(series) sonic_the_hedgehog sonic_the_hedgehog_(series) straight_hair testicles text threesome yaoi|72914952