Well done! Those are the main points for this OT3; It's all about the hatesex and, umm, conflicted and tangled web of emotions and motives. Can't really say it any more briefly.

One fic to recommend (sorry I didn't mention this earlier): A Wing Short of Flying (http://katcom.squidkitty.org/Fanfiction/WingIntro.html), AU that mixes them in a nicely dark way. This is about as close to a threesome I've found (besides what you've mentioned already).