rule 34 1boy 2019 abs animal genitalia animal penis anthro bodily fluids canine dated dialogue digital media artwork duo equine equine penis expansion furry genital fluids goo growth hans faffing cock hybrid penis hyper knot knotted equine penis koorivlf male male only mammal medial ring muscular muscular male nude open mouth paws penis precum simple background slime snout solo focus story story in description testicles text unseen char watermark wet wolf 3543084