Basically, sometime in the next couple of chapters he'll start spoiling her even more (and actually their first kiss should be coming up really soon). Lots of fluff happen between them before Soleia reappears. After a few events caused by Soleia she'll eventually go back home with a promise to return once they finish hunting down rogue magic users, with them keeping in regular contact through letters, and get married. During that time-frame Yeni will be working on solving her body's reaction to magic so that it doesn't threaten her life. I haven't read much further than that though so no clue when the reunion occurs or what happens after.