...Perhaps a few sips. As much as you need, so long as it will not endanger my life.

[He brings the knife to his palm, pausing for a moment to brace himself. And then he drags the blade hard across it, cutting into his flesh, drawing out a handful of blood. He winces in pain throughout the act, trying to hold in his cries, but is only partially successful as he does let out a few groans. Once finished, he pulls back the knife and holds his bleeding hand out to the vampire.]

So...you are unable to bite people anymore...?