Now that I have gotten over my aversion to ffn formatting, I, too, am enjoying this story.
I think the very formal rules of courtship fit the theme of Lalli trying to figure out the rules by which the world works, and how they can work for him rather than against him. (And the setup feels a bit escapist, too: I think many people would prefer it if the rules of courtship, and many other social interactions, were clearer...) The backstory and the Leif subplot are a little less escapist, of course. I admire the way you give very specific and believable examples of Roni's behaviour.
And I, too, started out wondering whether I was stumbling into the middle of a series, but I find that the story works as a standalone: we do get all the relevant information over time.