If you like Queen's Thief you may also like the Tuyo series by Rachel Neumeier. Featuring, among other things:
secondary world fantasy
multiple interesting cultures
Honor and Duty and Obligation conflicting with Mercy and Hope and Peace, and the attempts to reconcile both
people loving each other deeply and hoping desperately they won't be obligated to betray and/or kill each other
It's a (currently) 11-book ongoing series that moves back and forth between different protagonists in different parts of the same world. The trilogy formed by Books 1, 3, and 7 is the part I'm most insane about, but they're all good. The THEMES man. The Conflicts.
Content warnings, though: Mind-control horror, violence that includes gruesome execution methods, weird social norms about marriage, mentions of (never described, never really in-scene) rape and sexual abuse, including to children.

















