That guy yells a question in some language that really likes L sounds.

"I didn't actually understand a word of that," he says, and then jumps up into the air to indicate how high he can do it. "Can I board?" he asks, pointing at himself and then the house.

He makes considering noises, then shakes his head. With a 'wait a sec' motion, he does some things in the control room before tossing down a rope ladder and climbing out.

Sadde zips that way and waits for him to finish getting down.

He lets go and falls the last ten feet or so, letting his boots catch him with a soft blue glow.

...cooool.

He points at himself and says, "Sadde." Points at the man...?

"Nils."

He tries a bunch of other languages.

That's a surprisingly regular-sounding name, for an alien!

Sadde indicates having no knowledge of any of those languages, and wishes he could express how eidetic his memory is. Oh well.

Nils names a few things, demonstrates basic grammar, then asks if Sadde something something to something... He holds both arms up, referencing the giant horn he used to wave the ship down.

Sadde repeats the things perfectly, and when he sees Nick-of-the-held-arms holds his right hand palm up and starts producing it again, from there. It looks like his skin solidifies into bone and then said bone starts pushing out of it.

Clap clap clap. That's an interesting, useful seeming thing for a Fair Folk to have.

He has paper, and starts drawing.

Points to himself, says a word. Draws a human figure, says the same word and writes it in a strange alphabet. Draws a... Mermaid? Head, two arms, fish tail. And gives it a different word. Then a human figure with sparkles, and he looks at Sadde questioningly.

"Vampire," he says in English.

This language doesn't like loanwords much, apparently, since he returns with "van-kire" and writes it down as such.

...What now? Nils doesn't seem to know how to ask his next question.

Well, Sadde doesn't know what Nils' next question is, so instead he'll try to get the concept of an eidetic memory across. He mimes writing, and tries to convey that he'd like to use Nils' writing implement.

Sure, here you go.

He writes all ten numerals, speaks them out loud while counting with his fingers, then points at Nils and at the numbers.

Nils takes the paper back, then recites and draws the version of numbers he's familiar with.

Sadde repeats them, nods, then takes the paper back and writes a string of ten digits at random, in Nils' script. He looks at them, then points at himself, closes his eyes, and recites them. Then he points at Nils, at the paper, and at himself.

He's still confused, but he writes a long string of digits anyway.

He looks at them, closes his eyes, turns around, and recites them again by heart, twice.

Clap clap clap again.

Alphabet. Then he goes back up the ladder and waves Sadde to follow.

Sadde follows!

This is, in fact, a control room.

He idly starts building Sadde's vocabulary as they walk though what does end up looking a lot like a flying house to a study/library sort of thing.

This: Is a nine volume five-language dictionary that includes surprisingly detailed little illustrations as one of the languages.

...oooooh!

Okay this will speed things up by a lot.

That's the idea, yes. Nils watches him rapidly flip pages with amusement.