We've been teaching Demon Lord Prim all about our world, and she's teaching us about hers.
The demon world strikes me as a very Lawful Evil sort of place. They're truly brutal with criminals, but what constitutes a crime can be questionable. Especially for other Demon Species.
It's in the agreement that they will abide Dragon Law if they leave their territory, but it's good that is a Succubus Lord ruling what is now dubbed Fallen City. She wants to make her own Las Vegas, but hasn't worked out all the details yet. Like how to safely get tourists in and out with all the monsters.
The Succubi are planning on building a huge hotel in the trading post they will staff in the meantime, and we've agreed to turn a blind eye to the goings on as long as nobody gets forced or hurt. One feeding a month is survival level for a Succubus, so at least they can rotate staff.