Fic Title: Bleeding Daylight
Genre: angst, hurt/comfort
Why This Must Be Read: It's a slight cross-over with the Dark Tower series, but you don't need to have read those books to appreciate this beautiful fic (I haven't read DT myself). This fic diverges from the end of Season 2, and is just a lovely take on how Olivia and Peter might've found their way back from the Other Side together. The writing is so evocative, the characterizations are brilliant, and there's just something soft and gorgeous about the whole fic.
Peter misses the window, never crosses back over, and finally finds Olivia. She does her best to bring them both home. Neither of them had even considered that there were other worlds than theirs.