FURVERT!

all_fours anal anal_penetration anthro anus backsack balls butt close-up doggystyle duo echidna erection eulipotyphlan from_behind_position genitals hedgehog hi_res knuckles_the_echidna lying male male/male male_on_bottom male_on_top male_penetrated male_penetrating male_penetrating_male mammal monotreme nude on_bottom on_front on_ground on_top penetration penis presenting presenting_anus presenting_hindquarters quills_(anatomy)sega sex simple_background sonic_the_hedgehog sonic_the_hedgehog_(series)spread_legs spreading squish_(artist)thick_thighs white_background