Here is our history, as briefly as possible:
Around 2007/2008, A Single Spark was THE only Sess/Kag site around. ~Winter~ owned the site but had left the running of it to others. Our fearless leader, Miss Kagura was upset with the way some things were being handled and decided to create her own Sess/Kag site, along with Demonlordlover.
They breathed life into Dokuga, and many people from A Single Spark joined here too. Shortly after Dokuga was born, ~Winter~ decided to shut down A Single Spark... but Miss Kagura convinced her that we shouldn't lose all those wonderful stories from the years that A Single Spark was open. ~Winter~ kindly bequeathed all the stories from A Single Spark to Miss Kagura for inclusion here.
Given that Dokuga was a free-standing site before A Single Spark closed, Miss Kagura decided to leave the A Single Spark stories in their own archive and just host them as part of our site. She completed folding the 'Spark archive into Dokuga in around 2010, I believe, and it's been in its current form ever since.
All authors who left their stories on the A Single Spark site were incorporated into the 'Spark archive along with their profiles. Their stories were carried over exactly as written, or as close as Miss K could get. She wanted to honor ~Winter~ and her vision in creating the first and largest Sess/Kag single-pairing site on the 'net by leaving things as much the same as possible - but still making the navigation the same as Dokuga so that people who came along later wouldn't be confused.
As I was a 'guinea pig' for many of the changes and tweaks that Miss K made to Dokuga in the early days, I am, I believe, one of the oldest current members. (Unless Miss K and Demonlordlover are lurking somewhere - in which case, get your fannies back here!) All of us who knew her got a kick out of working with Miss K and wish she'd find her way back to us someday. In the meantime, our intrepid band of Admins tries to stay as true to her vision as we can!
Hope that helps answer your questions!