This is the list of QAF authors who have written multiple awesomely fabulous stories, and I recommend you read everything they've written.
Bigboobedcanuck: Series and gapfillers. Twelve Years of Christmas.
Burnitbackwards: Story list found in memories. A Way to Fall.
Cindelius: Stories not archived, just listed in her journal.
Eleveninches: Story list found in memories.
Josselin: Stories by she and Starla (soundczech) can be found here: Blatant Narcissism.
Julad: Her multi-fandom stories can be found on her site.
Juteux: QAF stories mixed with other stories can be found in memories.
Lennongirl: Story list found in memories.
Lierdumoa: Stories listed in memories.
Mintwitch: Story list found in memories.
Msjudi: Stories found in her memories.
Plumsuede: Stories found in memories. Everything at Once.
Reinabelle: Stories found in memories.
Rhiannon Hero: Stories also found on her site.
Quinn222: Stories found in memories. Also, Correspondence, Adventure, Memos.
Seperis: Her stories can be found at her site.
Severina: Stories can be found at her site.
Soundczech: Stories are in memories or at her fic journal, themagichour. Or at Blatant Narcissism.
Sweetestdrain: Stories can be found in memories. Your Kingbird.
Throughadoor: Stories are at her site.
TriciaQAF: Stories can be found in the journal, not archived.
Twistedinside82: Stories can be found at Shaky Grip on Reality.
Valereix: Her stories can be found at her B/J site.
Windtossed: Stories are in memories.