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2013 anthro comic dialogue echidna english_text erection flaccid foreskin genitals group gynomorph hi_res hot_dogging humanoid_genitalia humanoid_penis intersex knuckles_the_echidna male mammal monochrome monotreme neokat penis retracted_foreskin sega sex shade_the_echidna sonic_adventure sonic_chronicles:_the_dark_brotherhood sonic_the_hedgehog_(series)text tikal_the_echidna