Alys knocks on the door.
She reminds Ehail that she and her family are available whenever Ehail comes up with an analysis she wants to try.
Mial happens to see this letter, and comes up with a multitude of designs for possible wing extensions. Koridaar takes him to the bottom of the world and lets him try them out, in combination with the various safe lightening spells. He has lots of fun, but of course can do nothing to verify whether any of this would affect esu; he hardly goes two waking angles without birding around. Koridaar nevertheless records both Mial's observations and her own on the effectiveness of these various contraptions at augmenting a shren's natural wings, and sends notes and contraptions all to Ehail.
She didn't expect any. (Mial nevertheless feels that he has Contributed to Research, and is very proud.)
He writes down a list of all the places he isn't allowed to go, just so he can scowl at it. His mother observes that Dragon Island isn't on the list. Mial emphatically declares that he wouldn't go there even if he could, because that's where Grandfather lives. Grandfather, as far as Mial is concerned, can keep his dumb island.
Koridaar gives him a hug.
It is more convenient to cast it on both of them herself. She does that, records the results meticulously, and sends them back.
But now that there's an analysis available, it's easier for Koridaar to think about the field of dragonish analysis. She invents variations. When she has one she likes, that actually seems to provide clearer results and not just slightly prettier ones, she sends it back to Ehail along with the information from Avar and Mial.
It's too delicate a system for Koridaar to feel comfortable messing with; they've gotten far enough to know that the actual state of shrenhood, the reason their wings are too weak to be of any use, is some kind of delicate magical adaptation to patch a condition that would otherwise just kill them. Without a much better understanding of how it actually works, she's reluctant to spend much time coming up with possible interventions which she has no safe way to test. There's no equivalent of oranges and lizards to be had here; it's live subjects or nothing.
Koridaar and Avar are perfectly happy to babysit. They like Finnah.
Koridaar does... wonder, about this charming dragon's attitude towards shrens. She finds she wonders that about most dragons, these days. But he's dating someone who's raising one, so he's probably not that bad.