"They can work on daeva but have to be within a hundred meters, we are just planning to take lots of precautions so you're never within a thousand and if you somehow are you are welcome to just leave."

The fairy reads the fine print on his circle to check that he will in fact be allowed to just leave.

"...Okay."

"Thank you. We have a demon for the boxing part, payment is whatever you'd like her to make you."

"Oh, that's good. I accept."

"Thank you." Through Milliways, through the door, Theodore is holding it for them and Elf-supervised - he'd like Yasenry to make the surroundings of the nearest Dementor -

Yasenry does that. It's on the grounds.

He will give the fairy directions on how to take them to fairly-far-above-there-but-within-sight-of-it!

And the fairy does so.

Box.

Box.

"So you just want this - in space, nowhere in particular? What if it lands?"

"Ideally far enough out it won't land here or anywhere, if I'd planned this from the start I might have arranged to have them all somewhere near Jupiter so we can find them if we ever figure out a solution to their depression-monster problem but as it is, just - far."

"I've never worked in deep space before, I'm not sure I can find you again if I get it out past lunar orbit."

"- okay, how about we grab a hundred and then we can all go out into space together and in the meantime I will ask someone for instructions on things demons can make for navigation."

And he'd like Yasenry to write Cam requesting the aforementioned, and he would like all of these Dementors boxed.

Yasenry writes, and boxes Dementors, and the fairy brings all the boxes along with them.

And once they've got the ones on the Hogwarts grounds it's going to get more complicated.

....he doesn't recognize that location-  doesn't recognize it at the scale of a mile, either - the hundred miles around are Ireland somewhere - he shows the fairy a map -

To Ireland they go.

And narrow it down, and find it. And the next one. It's - well, it would be kind of tedious except flying is pretty amazing.

Has Cam written back with navigation instructions?

He has recommended a little starmap widget specifically designed to help fairies navigate the solar system.

Cool! Eight hours are up before they've tracked down a hundred Dementors; he has the starmap widget made and the instructions for it and hands them to the fairy. "This work?"

And Yasenry can be un-Imperiused. It'll be harder to do it again when he's being all consent-respecting like that but he thinks he can get into the right mental state for it.

The fairy fiddles with the widget and says it seems straightforward enough.

Yasenry looks dizzy.

"You okay?"

"I, I'm not sure I like it as much as I thought I would."

"That's fine. Want to go home?"

Nod.

"Can you make a letter to Cam, asking for another name, and then wait for his answer?"