FURVERT!

1:1 absurd_res annoyed anthro anus balls balls_touching big_balls big_butt butt butt_focus butt_size_difference duo echidna eulipotyphlan genitals half-closed_eyes hedgehog hellpasser hi_res huge_balls knuckles_the_echidna looking_back male mammal monotreme muscular muscular_male narrowed_eyes puffy_anus rear_view sega sitting smug_grin sonic_the_hedgehog sonic_the_hedgehog_(series)thick_thighs