He feels an open summons and lets it grab him -
"I can stake people in the grave, but if I have to personally handle it that's not efficient at all and I probably can't cover everything. I wonder if the CDC - you still have the CDC in 2008, right? - could make a dent if I told them."
"Yes, probably. Hello, CDC, I am a demon from another dimension, please listen to what I have to say about controlling the spread of vampires. Maybe I should just ignore vampires for the time being until I have more of a track record to point at. Mysterious ozone healing, mysterious bee recovery, then hello CDC would you like a century and a half of medical science by the way vampires."
"Okay, I'll have to figure out something else there, making stuff doesn't get me subscription access to an existing network. Are you the kind of vampire that is, shall we say, not a morning person?"
"Okay, I'll... hold off on making myself a wristwatch till I have that, I suppose. Do you sleep?"
"Yes and yes. It's more comfortable than it looks; there's a slightly hidden room containing a bed."
"Okay. Do you object if I nap in said crypt now, and can I get you to wake me up when the sun rises so I can go mooch off library wifi?" Pause. "Libraries have wifi by this year, right?"
"Preference between me making myself some form of furniture that you will then have around until you get rid of it, and me borrowing your bed?"
A bit of making later, and Cam is snoozing in a hammocky thing suspended from the ceiling, wings flopped over the edges and peeking out from under a fleecy blanket.
Sherlock makes tea. He drinks the tea. He contemplates the positive and negative aspects of the Cam situation.
Come sunrise, he wakes Cam up. Or attempts to. If saying 'wake up' won't cut it, he may have to strategize.
Cam wakes up pretty easy. "Morning. I hope you did not become suicidally bored while I was adjusting to local time."
"Happily, no. I still haven't found out how the school is going to respond to the fake summoning."
"The amusement value of observing their pathetic cover-up, or the interest of observing one that is not pathetic."