"One, I hope, since if you met another one that would indicate I was dead. But if Slayerish senses in particular get something from you, it's likely that there's some other kind of magic somewhere that gets something from you too. And I wouldn't know what kind it might be or who might have it. Magic doesn't tend to come in perfectly unique kinds without any overlap in scope. There's only one Slayer, but there's other magic that improves your strength or reflexes or lets you sense things most people can't or gives you unreliable, uninformative, and unpleasant prophetic dreams. Can you tell which part of the Slayer package I like the least? I bet you can."
"I'm going to guess it's the improved reflexes," deadpans Cam, "I don't blame you, those sound terrible. Okay. So I'm detectable via nonvisual means, potentially."
"Yeah. I thought that might be useful information. Anyway, regarding getting you your phone - do you particularly want to come along and shop for it? Either way, I think the simplest thing to arrange would be to meet back here or at some more easily findable landmark at some agreed-upon time tomorrow; the only difference is whether I bring you a phone or we proceed to go get one. I know the town better than you do, so you should pick a meeting place you know you can find."
"I can find this park bench tomorrow morning, does this park bench tomorrow morning at like I don't know eight work for you? And I will trust your judgment on phones, do you need the diamonds in advance?"
"Diamonds in advance would be nice but isn't strictly necessary. This park bench tomorrow morning at eight works just fine."
Cam shrugs and drops a little bag of diamonds into her hand. "I will see you tomorrow, then? Are you planning to surreptitiously follow me after I leave?"
"I'm not going to surreptitously follow you. I'm going to go home and give my aunt her diamonds and check out your future medical research."
"And is whoever has been reporting to you on suspicious demonic activity going to surreptitiously follow me?"
"Whoever has been reporting to me on suspicious demonic activity is not present, not particularly good at surreptitiously following people, and not planning any such thing as far as I know."
"I didn't notice being followed," Cam points out, "so obviously their skill at surreptitious following suffices. Although then again I also wasn't on the lookout for stalkers. Anyway. All right then. Hope your aunt enjoys her diamonds."
Cam waits around for a while, then wanders, makes sure he knows where the crypt is but doesn't stop there, goes back to the library and gets a large book and hides his computer in that book in an armchair in the corner and does notetaking, and then eventually meanders back to Sherlock's place.
He will find Sherlock sitting in his bed in his slightly secret room, drinking tea and reading Hound of the Baskervilles.
"Hi. The coat isn't sufficiently concealing. I made friends with someone claiming to be the Slayer and gave her a small bag of diamonds and a set of DVDs full of medical advances."
"Well that's interesting. What did this Slayer look like? Did she offer a name? Why diamonds? For that matter, what did she want with the medical advances?"
"I didn't tell her anything about you - although she was reading over my shoulder and I didn't notice and she espied a bullet point entitled 'things to ask Sherlock' because like a moron I was writing in English - and am now wondering if I should do the reverse courtesy, because, vampire, Slayer?"
"You can tell her about me if you like. Fair warning that she might try to kill me, but if she made friends with you under circumstances best described by 'the coat isn't sufficiently concealing', she might be open to reason on the subject. I am certainly not going to try to kill her."
"Okay, I'm going to take your word for that and will not be best pleased if it's not any good and would sort of prefer to be there if ever the two of you meet in case she does try to kill you. Her name's James but I think the rest of it should wait till I have her permission, which I can get tomorrow morning when she gives me a phone."
"Suits me fine," he says cheerfully. "Anything else interesting happen?"
"The computers in the library take floppy disks and run Internet Explorer, both of which I recall despising while still alive. But you have Wikipedia, which is nice, and it shows almost alarming consistency with what I remember considering that I know there's large differences under the surface. If there's a me, he doesn't have a Wikipedia page under his own name or under my anonymously-revealing-magic-to-the-
"Despising Internet Explorer is practically a national pastime as far as I can tell. How else might you go about looking for a you, with Wikipedia tapped out? The search might be mildly interesting."
"I'd check the towns I grew up in, look for my parents maybe, they were both public employees. In 2008 I'd try Forks first but Phoenix would be worth a try even if that didn't pan out."