Well all of the other players have created their CSs with restrictions on Demonology, so no, your character may not have demonology, Al though you'll likely learn it fairly early in the RP.

I really hate putting restrictions on characters, since I want all of you to be eager to play your characters, but I don't think It'd be fair to make an exception. Plus I intend for Demonology to be somewhat plot related, so I think it might be breaking if a player already knows it.