[ For a moment there, Aziraphale is simply trying to hide the fact that he really, really hopes he says yes. There are a lot of layers to his offer - besides having a genuine interest in books and actual skills in keeping them, he does intend on gathering as much information on this place and its 'god's as he can, and he does need something to focus on that will keep the spiraling dread at bay. He can do this, and he wants to.

He's mighty relieved when Kravitz accepts his offer so easily, visibly relaxing. ]

I assure you, I know a few things that might be useful in helping to keep this place in tip-top shape.

[ He pauses over the question. ]

Oh, hum. Well. I do have a great fondness for books, quite personally. But, also- I'm looking for ways to make myself more useful for, hum, the community.

[ That's accurate, right? ]

And this is something I have a long history in.