rule 34 2003 animal genitalia anthro balls biped bodily fluids bulge canid canine canis clothed clothing comic cum dci dialogue digital drawing artwork digital media artwork duo english text entrapment genital fluids genitals greyscale humanoid genitalia humanoid penis laboratory larger male macro male malemale mammal micro micro on macro mink monochrome murid murine mustelid musteline nude penis rat rodent sheath sheath play size difference size play smaller male speech bubble text true musteline wolf 5588260