rule 34 2021 all fours anthro ball tuft bodily fluids border chiropteran claws crotch tuft empty eyes erection fangs foreskin fur genital fluids genitals grey border implied transformation long ears long tongue male mammal membrane anatomy membranous wings monochrome muscular muscular anthro muscular male open mouth penis precum pubes revadiehard sharp teeth signature sketch small wings snout solo teeth tongue tongue out tuft uncut vein veiny penis were werepyre wings 4691309