I LOVED this, and I love the term "grownup orphans" for these two, as well as your thought stampede, haha! Fran and Balthier's partnership was one of my favorite parts of FFXII-- I love them to death and I think you wrote them beautifully here, and much as I also imagine them to be.
Re: "Grownup Orphans", FFXII, Fran & Balthier (F/B if you squint), G