God, this is absolutely, utterly amazing. Lily's characterisation is just wonderful, and the way the story is focussed through her, layered through with her emotions and understandings as well as quite clearly communicating Severus and Harry's, is just ingenious and masterful. I loved Albus, and Lily comforting baby Tom, and Gellert, and the juxtaposition of Harry's two alternate futures. I cried, and I laughed, and let me also say your dialogue was just crackling, and the sex was just brutal and powerful, like they were demolishing each other, and I don't usually read much Snarry fic - because I just can't get my head around it, mostly - but god, everything about their relationship, both snark and sex, just felt so powerfully raw and right. I've never believed in the pairing as strongly as I did reading this fic. Just magnificent.