The empress of S:AAB fanfic is Sheryl Clay, whose Queen of Hearts series gives Colonel McQueen a believable, in-character shot at happiness. (I'm a sap. Sue me.) She also writes heart-wrenching vignettes about life as a young In Vitro. Her prose is beautiful. Go to the Fanfic Flightdeck at
http://fanficflightdeck.space-readyroom.de/ and click on the Writers Database, then start with "Would You Have Loved Me if I Knew How to Dance?" and stay up all night finishing the rest.
While you're there, you should also check out Tom Bissett's poignant and memorable (said his beta reader modestly) "Yellow Ribbons" and "Daddy's Little Girl."