OK, so I was reading some stuff I had saved and I can now answer my own question!
It was part 2 of Into the Ether (http://www.livejournal.com/tools/memories.bml?user=bloodyrose82&keyword=QaF%20Series%3A%20Into%20the%20Ether&filter=all) by bloodyrose82, which is itself a sequel to a post-513 series called After the End (http://www.livejournal.com/tools/memories.bml?user=bloodyrose82&keyword=QaF%20Series%3A%20After%20the%20End&filter=all). I cannot recommend these highly enough; unfortunately Into the Ether seems to be on permanent hiatus, but they are both just phenomenally good.
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It was part 2 of Into the Ether (http://www.livejournal.com/tools/memories.bml?user=bloodyrose82&keyword=QaF%20Series%3A%20Into%20the%20Ether&filter=all) by
Enjoy!