The rough kiss made Oliver gasp in surprise, though he really should have been expecting it. His lips parted instantly against Keith’s, allowing him to deepen the kiss. After the initial shock wore off, he kissed back with equal intensity. a clash of tongue and teeth that made him shiver. Then he felt a prick at his palm, the sharp sting only making him moan loudly. He got off on pain, whether it was his own or somebody else’s. He held still until the knife stopped, then curled his fingers, tensing the muscles there and making blood well in his palm. Once he felt the knife move away and the kiss was broken for breath, he lifted that hand to his lips and licked the blood away, letting Keith see the scarlet staining his tongue, before he pulled him down for another kiss, letting him taste it too.