rule 34 ai generated anal anal knotting anal sex anatomically correct anatomically correct genitalia animal genitalia animal penis anus ass to ass ass up balls bodily fluids canid canine canine penis canis cum cum on ground detailed detailed background detailed fur director firewolf duo feral feral on feral forest fox furryrock model genital fluids genitals grass hi res knot knotted knotting looking back looking pleasured male malemale mammal open mouth paws penetration penis plant raised tail rock sex size difference teeth tree wolf 9128177