He feels an open summons and lets it grab him -
"Probably via his parents. They're both public employees, it should be doable, just mildly complicated. Okay, back to the desert to make myself a little house."
Then Cam opens the front door. There is furniture and plumbing and two bedrooms and a prettily-carpeted living area, but he has neglected to include a kitchen, probably because he can just make food out of nothing.
There is a bookshelf. Cam picks up a volume of the encyclopedia on it and starts flipping through it.
"One thing I find really interesting about my magic, actually, is that it becomes so much more useful as more things about physics and engineering get learned. Hell is naturally an infinite empty void. Most demons live on a giant plane of solid gold that someone grew until it was big enough to exert a gee. It's extremely tacky. No one had discovered black holes or, like, gravity, at the time."
"There is actually not a lot of history kept in a written-down-and-therefore-conjurable-
"In human culture, yes, absolutely. Demons pop into existence fully formed and adult, and when they aren't ex-humans, they don't even come with languages installed. Talking to each other at all took a while and might still be unpopular if it weren't for the fact that we tend to appear near other demons. Writing took a while, the scientific method took a while, and there's not much, like - improving the welfare of demonkind, motivation. We are indestructible and can all have whatever we want any time."
"The angels have a different result from a loosely similar background situation, admittedly - but they aren't quite as powerful, even if you give them a head start by supplying all the cloudy fluff Heaven is made of that they can use. Fairyland is way more interesting all by itself than a void or an expanse of fluff, but they don't have much good magic helping them along with the sciencing, they're pretty much just telekinetics."
"Hey, at least we don't have vampires and a million kinds of demon, do your million kinds of demon do much science to speak of?"
"And you don't talk to the demons he summons when he has them in to change lightbulbs and fix the sink?"
He rolls his eyes. "And he's never done that before either, but it's the sort of thing he'd do. Needlessly magical, needlessly dangerous solutions to ordinary problems that don't need them."