FURVERT!

anal anal_penetration anthro axton bent_over blush border_collie bottomwear bottomwear_down butt canid canine canis clothed clothing collie domestic_dog duo erection feet genitals german_shepherd herding_dog knot male male/male male_penetrated male_penetrating male_penetrating_male mammal pants pants_down partially_clothed pastoral_dog paws penetration penis sex sheepdog signature unknown_artist unknown_artist_signature