Oh wow this makes all kinds of sense it's so cool "You're really smart!" And it is so great not being talked down to—although her mother never did, but the teachers and everyone else did and now she's sad.

He totally doesn't notice that because he is too busy excitedly explaining - "and there's a different kind of problem that turns out to be related to this one, and that is the problem of telling how much he's accelerating at a particular instant off a graph of his speed -"

Okay she can follow and become not-sad again by paying attention to the explanation.

And she will think it's pretty cool that the finding-the-tangent-to-a-line process is the exact reverse of the area-under-a-curve one, right, because it's pretty cool.

Wow it's awesome and more complicated than anything she's ever done ever but so cool.

"You'll probably want to play with it a bunch to get a feel for it, I can make a textbook if you want to do actual formal problems or you can just poke the computer into giving you new curves and then play with them."

"Can I do both?"

"Yeah, definitely!" Here's a Federation calculus textbook, here's a not-chip-locked computer she can play with. He flops contentedly on the floor. 

Eeeee Sadde will have fun with this. "This is cool you're cool I like you."

"Demons have the best powers. And I like you too, I'm glad I joined the Wards. I was worried it'd be weird, I don't really know any other children."

"I knew some children in New York but they mostly didn't like me. And every other Ward is super old—well, for a human—and they won't really let me do anything because we don't even know what my powers are yet and even if we did I'm too little to be allowed to do anything."

"How can you not know what your powers are? And they let me do things and I didn't even tell them I was a hundred twenty two and a half? But maybe that's because they were desperate and also wouldn't have exactly been able to stop me."

"If I go out they think I'll probably die," she shrugs. "And I got my powers yesterday and all I know about them is that they let me be a girl and they rescued me from under a lot of heavy stuff."

"That sounds pretty useful. And yeah, don't die, I can't do people without help and my help doesn't know how to find me."

"I dunno if it's useful, if all it does is let me look like I should look and rescue me from under buildings I won't be a very good hero. What's your help?"

"I mean, you could help other people transition, if you've got a general power for it? There are lots of humans who'd want that, most worlds. And in the place I'm from there's someone with magic that can combine with my magic to resurrect people."

"—any people?"

"Yeah. Eventually, once my help finds me."

"How long do you think they'll take? Do you—do you think they could do my mom?"

"I am totally sure we could do your mom, and we will, but I don't know how long they'll take it might be years."

"Oh. Okay."

"I'm sorry."

"It's not your fault. It's Behemoth's, and you got rid of him."

"But I didn't put him far enough and I don't have resurrection and - my mom almost died and it was horrible -"

"—I'm gonna go do math," she says, grabbing the textbook and the computer and going off somewhere.