I don't know about the kingdoms uniting just yet. I think it's going to need a few more generations of intermarrige for these two countries to relax around each other. It's good that Seb so obviously loves Siri though, that sort of imagary can be very powerful, if couched properly. I'd like to see some of Siri's other siblings, perhaps the middle monk one (hereafter known as mm) can come visit? The heir is obv. not going anyplace and they've lost Viv, but I can definatly see some interesting situations with such a devout Austerean coming to visit.
And don't forget, this whole gambit pileup/war has been a Pahn Khal conspiracy. I can see that turning very nasty, how deep does the betrayal go? How willing are the Hall-ers to look past/forgive what might have been disastrous for them? I bet there are reprisals, even if Seb and Siri want to go easy.
Which brings to mind the question of how much everyone actually knows about what happened. According to the general population the lifeless go marching off North and then a bit later those statues come to life and chase them all down! Now bringing stone to life, that much stone too if most certinaly the work of the God-King, but why? Obv. someone got the Lifeless under their control. That everyone knows, it would be hard not to, how much else of what happened is actually known to the city at large? I assume the various priesthoods are gossipy enogh that most of them have the basics at least. With Lightsong and Blushweaver gone, I'm not sure you'll find any other gods who we can count on to be interested, but maybe Seb can shake them out of their complacency.
I could see Hall-ers and Idrians as a whole backing up and shaking their heads saying, 'did we nearly just do that?' but not for too long, not longer than a year, are Seb and Siri savvy enough to take advantage of that grace period? Or are they too busy staring into each others eyes?
I'm not sure I like Viv dissappering like that. At some point Siri will get in contatct with her father, but Siri doesn't know much of what happened either. Perhaps Viv could consider a farewell letter or something? And at some point will we get to know what The girls Father was actually thinking? Was it really just, 'I can't send my favorite'? What does he think now? Arguably the deal kind of worked out, at the price of the daughter he was planning on 'losing' and the one he wasn't sure what to do with he's probably going to get some very concilitory and 'heartfelt' advances from the Hall-ers wanting to tie themselves to the country of their new queen. I predict some very nice trade agreements.
This is too long and I've still got ideas so I'm going to stop now before I end up writing a freaking essay . . .