He glanced in Arthur's general direction and after a moment of inner debate, he ignored what his brain was telling him, and tentatively opened his mouth against the point man's wrist. At first licking a little then starting to slowly suckle at it.

Clarkie had tasted his own blood of course, once or twice through split lips when he was a boy but there was something... a little different about drinking from Arthur. Okay, not a little different -- massively different if you count the fact that he was drinking blood in the first place.

He lifted a hand to Arthur's arm so he could hold it firmly to his mouth, drinking what he could. Clarkie could feel something changing -- something happening to his body.