What no mention of the Epic Arsinoe fanfics?
Victory at Ostagar by
Arsinoe de Blassenville
When Bryce Cousland's little spitfire scaled the Tower of Ishal and lit the beacon at the critical moment, King Cailan won a mighty victory against the darkspawn. The Blight, however was far from over. All other origins included, plus Hawke and his companions. Cousland/Loghain, Morrigan/Anders, Surana/Zevran, Fergus/Anora, and more. Half a million hits and still going.
Dragon Age - Rated: T - English - Adventure/Fantasy - Chapters: 128 - Words: 1,173,590 - Reviews: 4959 - Favs: 1,011 - Follows: 779 - Updated: Dec 1, 2013 - Published: Mar 19, 2010 - Cousland - Complete
Note: Normally pairings that are explicitly stated like this are a BIG WARNING to STAY AWAY. However, they are fortunately not a major part of the story line and can be mostly ignored. Also, she is painfully honest about the difficulties and challenges in a relationship. This is I suppose the difference in a writer who is am adult, and a writer who is a teenager.
Its true that she tends to write female characters which is usually hard for me to empathise with and tends to favour Loghain, but she is a wonderfully deft writer who explores the politics, socio-economic world of Dragon Age in astonishing depth without plot dumps.
Her other stories set in DA are pretty good too, I especially enjoy her short stories anthology which is much less intimidating than her completed epic:
https://www.fanfiction.net/s/9749577/1/Dragonsteeth