FURVERT!

anthro avian beak big_muscles biped bird black_clothing black_underwear blue_body blue_feathers body_size_growth boxer_briefs bulge canid canine clothing duo falco_lombardi feathers fox fox_mccloud fur growth hi_res hyaku_(artist)inside macro male mammal muscle_growth muscular muscular_anthro muscular_male nintendo orange_body orange_fur room_filling size_difference size_transformation star_fox transformation underwear