ivyblossom was one of the original BNF's (in the good sense) who left HP fandom just about when I came on board. You can find most of her fics here (http://archive.skyehawke.com/authors.php?no=550). I especially recommend Blue Vase, Sodomite, Desires What is Understood, and Triptych.
The story arc you're asking about is: 1) Origins 1A) Breathe 2) Haven 3) Belong and 4) Quiescent (which is a never-to-be-finished, 4-chapter WIP). I'd add Simple and Question Answered as post-Belong additions to this universe. Haven was written first, and the author acknowledges there's continuity problems with it. Origins is probably the most well-known of the three, with one of the most vivid kisses ever written.
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The story arc you're asking about is: 1) Origins 1A) Breathe 2) Haven 3) Belong and 4) Quiescent (which is a never-to-be-finished, 4-chapter WIP). I'd add Simple and Question Answered as post-Belong additions to this universe. Haven was written first, and the author acknowledges there's continuity problems with it. Origins is probably the most well-known of the three, with one of the most vivid kisses ever written.