FURVERT!

all_fours anal anal_penetration animal_genitalia animal_penis balls canid canine canine_genitalia canine_penis canis domestic_dog duo equid equine equine_genitalia equine_penis erection feral feral_on_feral feral_penetrated feral_penetrating from_behind_position genitals horse knot knotted_penis male mammal medial_ring open_mouth penetration penis sex size_difference smile tailtease tongue tongue_out wide_eyed