oh no that's adorable....Grell would try to stop her and give her back her coffee and be charmed that she knows the quote as well, and they can discuss whatever books together. and if she wants to learn a new language Grell'd be happy to help her because it keeps her own skills sharp since she doesn't use it as much as English but she wants to stay on top of it so they absolutely must!

as for her job, she won't hesitate to tell if Ain asks her what she does, it's just a knowing that people usually are reasonably grossed out by dead bodies and waiting for Ain to do the same, but she'd be so touched if she read up on it, honestly. and she'd admire Ain's patience and dedication towards being a teacher so much....i have a feeling they're going to be amazing friends.