Wow, this is really good. You should have mentioned this story earlier; I would have been the first to comment (though technically I still am).
The prologue's really intense. I like it and find myself wondering how they got where they are. Their closeness is also very interesting, and I can't wait to see where you're going with the story.
Keep up the great work!
(I know the story was first posted almost a year ago, and that we've both sort of abandoned Mibba, but it doesn't hurt for you to know how great the prologue is.)