I'm pretty sure that ShouldKnowBetter is the one who came up with the pairing in the first place.
I believe it occured in her "
Daybreak" series with a Captain Soval from another universe that Amanda Cole meets. The series is actually a TnT fic... I don't know how long after that her other S/A stories came about (there is another one: "
The Mean Old Vulcan and the MACO")
It caught like wild fire in
Soval's Annex... some wrote only friendship fics with the two of them... Linda usually writes post-marriage fics. I know one author on FF.net that writes about them as well.
I'm relatively certain that's how it happened.
I came late in the game and discovered S/A when ShouldKnowBetter released her final S/A fic ("There is No Sin But Ignorance")
Yes, it's a weird pairing. But I like it.
My fic will be decidedly different though. I have a slightly different take on things (particularly the character of Amanda) and choose to have my story take place years after ENT and deal with some serious issues that are not necessarily S/A centric.