[Suzerain of Sheol]

Okay, I just wasn't sure if they simply had a bond with each other or were out-and-out telepaths.

About the flow, I think in places your sentences are slightly too technical. Take for instance, this sentence:

Alex grinned – and didn't make any attempt to hide it – at the laughable thought of the rebellious little waif trying to cause him any physical damage.

It's just kind of cluttered and is a bit of a chore to read. Just for purposes of example (and if this offends, please, slap me and I won't do it again), it could be rewritten something like

Alex grinned shamelessly at the thought of the rebellious little waif trying to hurt him.

to say the same thing in fewer words. You do run the risk of losing nuance by doing that sort of editing, and I obviously couldn't account for that, but I'm just trying to point out what I mean. The changes don't have to be drastic, either, even a word or two excised can help with the flow.

Anyway, you're welcome, and good luck with this project. There's actually more I could have said to compliment it (like your use of a consistent point-of-view and using it characterize Alex), but as I said, I don't tend to dwell on the things that aren't problematic. Hence the rather short critique. :)