Kanim crashes at the castle for a few days, then he buys Bella's old house off her, makes it walk to a more comfortable distance from the castle, and just visits a lot. He is very helpful. Tony makes spectacle frames, Bella makes lenses, Kanim makes out with Tony. When the spectacles and the window are completely replaced, it is spring, and Bella plants herself a garden of important herbs on the castle grounds, and takes apart wizard staffs with Kanim.
Kanim really likes Tony; he looks at her rather like she fell out of the sky into his lap and he's trying to figure out how she could possibly have happened. He really really likes her. He does not want to marry her. This is made extremely clear when Queen Marianne asks how he would feel about being Tony's backup husband possibility in case Bella cannot solve the technical issue, to which question his response is to bolt from the room at top speed shouting "I AM GOING TO GO HELP BELLA WITH THAT SPELL NOW."
(This is, he feels the need to explain to Tony later, no slight against her undoubtedly stellar qualities as a potential spouse. Which he wants Bella to enjoy. Which he will not be partaking of himself even though it is, evidently, not a law of nature that only one person can marry a given other person. Because he does not want to be any sort of royalty and be asked for things even if his only duty would be to impregnate another sort of royalty. He is not even sure he wants non-royal children.)
Bella works on the spell, and Kanim helps. It's mid-Pink when Bella finds her beloved Sherlock and says:
"I think this version will work, even if it would be premature to test it before Umber. Which throws into rather stark relief the fact that if I cast it, eventually we will have a baby princess on our hands, and we have not actually discussed parenting."