10. Turn both of them (or just Xel) into humans. No more family - er, species - feuding!
9. Have Zelas order Xelloss to help Fi raise Val. Xel will learn to love, and Fi will become attached to Xel's presence.
8. Xel's deeply hidden human emotions are re-awoken by Filia's presence. He then comes to terms with these new emotions.
7. Love potions work wonders (and havoc) with relationships!
6. Cupid's arrow pierces some hearts. (Now starring, Rezo the - no longer dead - Red Priest as Cupid!) (Get it? Love is blind; Rezo is too. hehe Nevermind.)
5. Truth or Dare is always a fun game to play....
4. Lina and company could become matchmakers! (Author pictures Lina threatening Xel and Fi: "You will love each other; or else, here's a Dragonslave with both your names on it!!" ^_^;;) Or maybe not.
3. "Under the mistletoe!" (Quote from a fic by Writer.)
2. Get Fi and Xel (or just Fi) either drunk, stoned, or both. (Author has an idea for a fic with just Fi drunk. Author should get around to writing that. Author should stop speaking in third person. @_@)
1. Let their relationship develop naturally! (I wonder just how many centuries THAT would take.)