This rang so very true to canon, with Snape's unending love for Lily and his need to have her any way he could, even in death. The characterizations were spot on, from Harry's selfless acts and his friends' steadfastness, to Snape's selfishness.
I'm not the biggest fan of epilogue-compliant fics (although, that says more about JKR than fandom writers), but this was such aching perfection and wove so wonderfully with what came after in canon that I can't help but love this.