Okay, now I know why this got rec'ed all over the place! I admit, by the time that this story was posted, I was opening things I wanted to read in tabs and ordering the tabs by fic length, so I didn't get to this until last night, and that was with skipping over two shorter ones. (Only three to go!) I didn't review last night because by the time I finished this, I was not only too sleepy, but too emotionally exhausted from reading it.
Anyway, this is phenomenal. Lily is so multilayered, and so real, with her hate and her love and her accumulated small regrets, retreating into a construction of her own past when she can't take James and Sirius recreating theirs. I love the way she feels guilty about her (re-)growing affection for Severus, as if she were cheating on James -- and how James is intrigued when she fights with him. (Oh, and "desecrating" the trysting spot by fighting in it? That was a great image.)
I also love how you showed Harry and Ginny's relationship -- there's nothing particularly wrong with it, at least at first, but there's nothing particularly right with it, either. (Whereas Harry and Severus has so much that's wrong, but even more that's right, making it an overload in comparison.) I read some of your early review replies, and yes -- fanfic can grow out of what JKR showed, but didn't seem to see; sometimes we want to take the complexity that was hinted at and actually develop it, rather than cramming everything back into a formulaic ending. This is one of those stories that does that beautifully.
Lily, I think, won't mind the loss of the tuner so much. Now that Remus is around to distract Sirius some of the time, James should pulled her into (or away from ;-) things more often! (Oh, and I like the hints of Regulus/Tonks.)
There are dozens more things I could say, but I must clean for company. Thank you for writing such a marvelous story!