"I can go ask if you'd like, your highness?"

"Sure, go for it."

Off goes Kerem.

Okay yes breathing time for her, too.

...She could - she doesn't want to let any merfolk know she's here, she can't let them, but - as long as she starts quietly and works her way up a crescendo, she can as part of that magic direct the sound up.  She'll aim for the remaining human, specifically, and - she doesn't want to seem as though she's making a threat; she'll keep the audible part to a few bars and switch to a set song, one for fry, one that anyone who knows how magic music works should be able to tell isn't magic, even if they've never heard the song specifically.

This human has never actually heard of magic music! But that means he doesn't find music especially threatening.

Shark-being has a voice. He was sort of not expecting that. Sharks don't make noises even when whales do.

(It's a very nice voice.)

Back up!

...he will sing the first verse of Blithe Lake and see if the shark-being does anything.

- She waits a few seconds after he finishes and then dives back down to (after the prerequisite quiet magic) serenade him with a full verse.  And then back up!

Having heard the tune of her song twice he can croon it back, more or less, though the words are hard to pronounce and he doesn't try.

Coming here is the best decision Cyllene has ever made.  How does she convey this.  Wave wave wave.

- One wave (of the oceanic variety) is a bit choppier than the rest and engulfs her; she takes the chance to breathe and lets it carry her higher on the line of graspable things; she's better at holding her weight up than at hoisting herself.

Kerem comes back with a fish and hands it to Cymbeline, who tosses it down to her.

- She doesn't catch it but she does give up her high spot on the side of the ship to dive after it.

These people probably don't know she's a princess, and that means she doesn't know why they're giving her a fish.  Maybe it's just like trading plain music back and forth... but she doesn't have a way to give them anything, right now.  She could do some magic for them if she knew what sort of things they wanted.

She doesn't eat the fish, and times her next approach with another large wave so it's easier to establish a cling one-and-a-half-handed.

"Well, she's not eating it. Maybe that's not the kind of fish she eats, or maybe she only eats seaweed."

"She?"

"Judging by the singing voice."

Okay, it's not as though they gave her a living fish, and no nets are yet making themselves evident, so it might not have been a warning...

She chomps the fish, and swallows it mostly whole.

"There she goes. Shark teeth."

"Shark teeth!" Kerem agrees in a higher pitch.

...That other human sounds maybe upset?  She'll fall back underwater and sing another fry song, this time to both of them.  One about sharing.  Cyllene finds it pretty condescending, and did when she was a fry herself, but she's nearly certain that they won't be able to understand it anyways so what does it matter.

This at least does not cause the darker colored human to make more upset sounds.

There are starting to be enough clouds blocking the sun that Cyllene can see the humans a little bit better, but it's still not enough that she can really make out any individual traits they might have.  One of them has more hair than the other, she thinks, but it's still pretty short for a merfolk.

Do they do anything else?

The lighter colored one will sing her another verse of his song!

Oh, that's just what she wanted!  She waits for him to finish, again, and then disappears to sing it back to them.  She does most of it in a neutral syllable, but one of the lines was the same in both verses and she has a go at replicating some of the sounds, there.  And then she's back on the side.

"I wonder if she could learn Loegrian."

"...you might have to find out later, looks like the sailors want us inside, weather's turning."