Cas is in the habit of using the wind to listen for that voice saying his name. 

"Yes, Captain?" 

His voice, when the wind carries it back to Jacob's ears, is coldly neutral. 

'Captain'. Oh, that isn't a good sign. What can he say to fix this, now...

"Come to my room tonight." Kadlawen is lovely, but he can wait. This is more important. 

"Yes, sir." 

His mood noticeably improves after that. He participates in conversations, quizzes Su-Jin on her magic experiments, and even manages to smile at Kadlawen when he comes back. 

And Kadlawen, quite unaware of this subtext-laden interpersonal exchange, smiles back at him! It’s very symmetrical.

“Hello again!” he chirps, eventually, worming his way around the dining hall towards Jacob. “I spoke with Lalvien - he thought that he might want to talk with you and try to establish lines of communication and all that nonsense. When would be a good time for that, do you think?”

Jacob has a smile for Kadlawen as well! It's an 'oh, hello, attractive person who gave me a very nice present earlier' sort of smile, rather than a 'you are responsible for the single best thing that's ever happened to me' smile, because Cas would get jealous again over the second type. 

"I should expect his schedule is less flexible than mine. I'd be happy to speak with Lalvien - that being the ruler on whose land you built this castle, if I remember correctly?" 

“We’re technically floating in midair - I don’t recall whether I mentioned that, it’s fairly default castle behavior - but we’re in his territory. Should I let you collect whomever you’d like accompanying you and then meet you outside, by the violet pillar?”

"We might as well leave together, unless you have a task to attend to first."

He stands, gathering Cas and Linden with gestures. "Mel, you're in charge."

A dark-haired man, presumably Mel, responds, "Aye, Cap'n," without looking up from his meal. 

”No, I don’t have anything in particular - I suppose we can be off, then.”

And so they, and anyone else following, can navigate through a few corridors, go out on one of the gorgeous bridges, Kadlawen can mutter and gesture and invoke -

A whirlwind plucks them out, spends a few moments in transit, and sets them down, on a gorgeous - lilpyad?

It does, actually, seem to be a lilypad, or at least stylized like one, made out of malachite and inset with occasional lapis lazuli stones, for variety. It’s floating in a very large, very serene lake, and connected to other pseudo-lilypads by little stepping stones, poking their heads over the lake’s surface. At the edge of this lilypad in particular, there is a table, made out of the same malachite as the rest; at the table is a chartreuse-skinned man, accompanied by a small entourage.

“Salutations,” says the chartreuse-skinned man. “Lalvien, Royal Taniwha Mage - you’re going to think that we hand out countries like people hand out popcorn to pigeons, at this rate, you’ve met more royalty in a shorter period of time than anyone I’ve ever known - and you might be royal yourself, by certain definitions - it’d fit the rhythm of things, although I don’t believe you’ve actually inquired - and I’m somewhat concerned by the fact that we might now have two royal kraken mages, but you’d have to be more vicious than a mad lobster with a chronic pain condition to be worse than Dato - anyways. I wanted to get a sense of how you’re planning to spend your stay here, and determine how we might most advantageously combine resources towards the goal of getting you back to your more familiar universe, and towards remaining thereafter connected to that universe, ourselves. How can you help me with those goals, if at all?”