Cam is dipping a grilled cheese sandwich into a bowl of tomato soup when he feels the summons. He goes ahead and grabs it. Doesn't even drop the sandwich.
She shrugs.
"So, since it has been determined that you'll be staying with me for some time - would you like me to provide a room for you?"
"Probably more convenient than me skulking around the halls at all hours of the day, although since I wasn't planning to sleep it's not urgent."
She opens another door, producing another empty room, this one of middling size with a window.
"Go ahead, work your magic."
"No-one other than me and mine will ever see this room, so feel free to generate as many otherworldly things as you like."
Cam has fairly conservative decorative tastes, but he puts in a nice abstract-patterned rug and nice curtains and a hammock, and a big-screen TV/monitor (to which he attaches the computer he's holding) flanked by a pair of speakers, and a chair with a squooshy back suitably for comfortably sitting in while winged.
"My books are all on here," says Cam, pointing at his computer. "I mean, except the ones you gave me, which I am going to read and then put back in their library. I can always add a case if I acquire a permanent family of physical books."
"I see. I suppose I haven't fully appreciated the usefulness of conjuring arbitrary things when you need them yet."
"We have a massive, uninhabited forest outside one of our doors. I'm sure we can find somewhere appropriate."
"Eugh, I don't like the idea of dumping in the forest. A real one, even, not just a list of five species somebody grew to liven up a place. I guess there isn't necessarily a better option."
"At home I have a tiny black hole. Impractical on a planet. I guess I could make a little pit digging robot to dig a pit in your forest and then at least the footprint wouldn't be too huge."
"It could! Also tunnels, although tunnels are probably more useful when you have trains, do you have trains?"
"Trains can go in tunnels and not take up space on the surface! It's great. But you have to run them without pouring exhaust into the air, kind of a key component. Which means running them on electricity, basically."
"One day. Shall I leave you with your books for the moment? I believe the sun is beginning to set, and I'd rather not spend my active hours speaking with you at length - please understand, no offense intended - I simply need to use this time as efficiently as I can."