Mmm, DAT THREESOME. I love it so much. Pity there's no fic out there for it :/

I think the general problem with X fic is that overall it's very pedestrian and doesn't go out on a limb with pairings or anything. Even the AUs are almost all S/S focused, which is a damn shame considering there are so many things they could work off of changing (Kamui, anyone? It IS mostly his story, after all).