Riley lost his composure briefly as Tao's teeth sunk into his lip, letting out a soft gasp as his knee brushed between his legs. "Can't let you do that." He groaned, nipping playfully at the vampire's lips. "If I did, he would start to want you instead of me." He licked his lower lip. "Maybe you should - show me what you'd do to him, just so I know what it would be like before I allow it."