FURVERT!

1:1 ancientonyx anthro anus balls big_balls big_butt big_penis butt clothing echidna erection footwear genitals gloves hand_on_penis handwear huge_butt knuckles_the_echidna leaning leaning_forward looking_at_viewer looking_back looking_back_at_viewer male mammal monotreme mooning mostly_nude penis presenting presenting_anus presenting_hindquarters sega shoes solo sonic_the_hedgehog_(series)spread_legs spreading thick_thighs wooden_box