Istredd stares at him for a few seconds and then laughs. "Oh how the tables have turned." It had been Lucifer not interested in giving them a choice before, and now him the one reminding them about it. "Yes, it has to be their choice." No amount of good intentions would be the right move here. They may be young, but this is their life. The only one they have.

You would never voluntarily go to Solvunn. The very thought of it is kind of funny too. Lucifer among cultish farmers. No, the real reason being Michael. They may be able to have an icy peace from afar, but in the same faction that would go very wrong. He laughs again, purposely projecting an image of Lucifer with a rake and a farmer's hat at him. Surrounded by goats.

Istredd would go mad without access to books, he would read all of their books fast and only be distracted by the magic, but still. Free Cities, that maybe would work, he wants to see their universities. He moves so that his back is against the wall at the end of Lucifer's bed, mirroring him from a few feet away. It's because his side still aches sometimes, although it might be his mind tricking him, since it's been healed.

Free Cities sounds big enough you could avoid Castiel. There's a vacation town on the water. This time an image of Lucifer on a beach with a drink in hand.