rule 34 2013 anthro biceps big bulge blush bodily fluids brown eyes bulge clothing colored cum cum through clothing ejaculation embarrassed eye spots fur furry geng genital fluids gloves marking green markings hand behind head hand on hip hands free male mammal markings muscular muscular anthro muscular male navel pecs shaded simple background solo special agent oso spontaneous ejaculation thick thighs ursid wet wet clothing yellow body yellow fur 4418882