What a wonderful story! I liked the way you handled Ginny--that's one of the most real characterizations I've ever seen her have. She spent almost her whole life loving Harry Potter, and as she approached middle age, she realized that it wasn't enough to sustain her any more.
The kids were great. The little bits of James and Lily we got were informative, and the side Albus Severus/Scorpius action was a wonderful complement to the main story of Harry, Severus, and Regulus Remus (nice name in keeping with JKR's penchant of having Harry name all his children after dead people).
I have to say that Kreacher was probably my favorite character in this story. He's just so harassed and hilarious--perfect.
I loved the ending, with Severus admitting he was wrong and Harry apologizing for any misunderstanding. Their awkward first time sex was great and keeping in the realistic theme of the whole story.