"Yeah, like, demon and angel powers have comparable applications and we've stabilized, but it could be a very long inconvenient eventually. I guess the pocket dimensions mean anybody can opt out if they get sick of playing Should This City Continue To Exist... The thing about declining to unexist structures with aware creatures in them, can you do that for the reversion power too? That'd limit scope and direct conflict. No reverting an inhabited neighborhood of fairies."

"It already refuses to revert if an aware creature would be made to intersect with a solid object." Brief thoughtful look. "Now it also refuses to revert if a surface which an aware creature is touching or resting on would be substantially moved."

"Okay. Fairyland in particular is looking at kind of a mess. Can you put new ex-Limboite fairies on the edge of populated Fairyland so they can have it out with each other and not wreck the attractive landmarks and cultivated areas and so on?"

"By default, no one who chooses to sort themselves into one of the three active types will be automatically transported to the relevant section. They will need to use the transit system to visit there."

"Which will tend to land them smack in the middle of populated Fairyland. Hm."

"That depends on how the transit system is installed. Which is its own complicated question."

"Oh, true. Are demons going to be able to copy these things?" He waves at the kiosks.

"Try it."

So he tries it.

"Okay, so manual installation by demons is out."

"Yes," she says. "Although I could provide you with the ability to instantiate transit stations if you wanted to handle some part of that task yourself."

"I mean, I'll take any voluntary powers you care to bestow on me. I do somewhat doubt I can personally and manually handle immigration to Fairyland."

"Perhaps," she suggests, "the initial transit systems could be installed in currently uninhabited areas until the majority of existing people who desire to sort themselves and visit other sections have done so."

"Yeah. I mean, this is mostly a Fairyland problem, Hell and Heaven could probably take it if you plunked transit points in the middle of each major city, but Fairyland with transit systems out in the attractive but at least not heavily developed wilderness for the first while sounds good."

She nods. "In that case, by what method do I return you to your section of origin so that you can bring me there?"

"About that, how exactly am I supposed to bring you anywhere?"

"You invite me to appear in your current location, wherever that may be, by deciding to do so. If you frequently make use of this ability after we have finished reorganizing your universe, I may become annoyed and remove it."

"And then you install these changes as discussed without doing a whole lot else and then you go home?"

"Yes."

"If I run into a glaring flaw of some kind can I email you or invite you over or whatever to point it out?"

"You may visit my domain - any transit address beginning with 0, in the new system - and approach the top of my tower. It is very obvious and easy to locate. Lower-numbered transit addresses will be closer to it."

"Okay, fly to top of tower to register suggested adjustments to new setup. Cool."

"So. How do I return you to your point of origin?"

"Concentrate on wanting to do it for like a minute."