Hello, and welcome to PPG.
Yes, you are quite safe with Solaufein. With Xan's non-bonded path, you'll get some player-initiated stuff in Chapters 5,6 and 7, a Xan-initiated dialogue in Hell(for all paths), and then, in ToB, he will come back(or, rather, he will ask, and perhaps even beg _you_ to take him back
). You won't have to trigger anything, it's his own decision. You'll see.
One thing: if you have Crossmod Banter Pack installed, that's great, but "Romance Conflicts" component of Crossmod Banter Pack may interfere, if you take Xan back in ToB AND keep romancing Solaufein. So, if you have Crossmod Banter Pack, Romance Conflicts, installed, you'll have to break up with Sola at the very beginning of ToB.
Oh, one more thing, since I'm a little bit confused with all these mods: what mod adds Xan romance to BG1? Is it a TuTu conversion? And if not, can the two be installed together?
This is easy enough. Xan Romance is added by BG1 NPC Project; it was my very first mod(first romance), and Domi, Kivan's author, contributed five lovetalks to it, too. BG1 NPC Project can be played with
Tutu conversion; EasyTutu is the best bet. Also, if you're interested, there's a Xan Friendship for BG1 in
Tutu mods sectionAnd glad you liked the mod.
I do love Kivan a great deal, too - and, by the way, I am very, very fond of Xan fanart, so if you have ANY to share, please, go ahead.