Avatar fic is also turning out to be longer than expected, not huge, but it's grown a plot too. I may have to write some short porn just to get it out of my system ::g::.
Then there is the HP/Avatar bunnie that has started hopping around. So not fair! It hasn't grown a plot yet, but it has a premise, I'm hoping it will just stay that way. Pretty mental images are not helping!
Question for Avatar fans Can Na'vi/Avatars breathe normal human air?
[Edit: oh a debate, this is fun :)]