With a huff, Gamzee managed to slither the tip of his bulge down away from Dave's grip, setting it on a course south. He smirked as he brushed his protruding fangs against the lobe of Dave's ear, and rumbled, "Don't gotta be gentle at me. Mark me up. Make up for the color you fuckin' lack." He ground up against Dave again and teased against the other's asshole with the tip of his bulge, simply flicking the tip against it, chuckling quietly as he moved his mouth down to very pointedly prove himself wrong, nipping the other's neck without leaving a mark.