This is "only" fanfiction, but it's absolutely perfect. This is what the epilogue to Deathly Hallows should have been. I didn't hate the real epilogue like many fans did, but it did leave me wanting more info and closure.
This fic not only provided all of that in a flawlessly canon-compliant way, but it reduced me to tears.
http://casirafics.livejournal.com/440900.html