"No kidding, I mean, it's your brain being affected." He steps back, encouraging Mycroft to wriggle forwards a little more.

Butters closes his eyes and swallows, but he feels like Mycroft deserves an honest answer in reply.

"About half an hour after I broke down the boards I'd had nailed over my apartment door. I was standing over a woman." He closes his eyes.

"Drinking blood is bad enough. But to sustain life it's- it's better to drink a little than to take too much."