“No, I told you. You only pay once,” the dark-skinned, white-haired, pointy-eared creature said. “You pay once upfront, and you get access to magic. Simple as that.” She snapped his fingers to drive the point.

George scratched his chin. “Yeah, but two litres of blood? That’s like all of it.”

The pointy-eared creature sighed. “You have more than that in you and you’ll replenish it in a couple of hours or so.” The creature flashed a row of white teeth and put a slender arm around George’s shoulders. “Besides, it’s not like it’s going to kill you or anything. I wouldn’t allow that, would I? We’re partners.”

“I don’t know…”

“OK, listen. Do you want to learn to use magic yes or no?”