Or Babblings About How My Mary-Sue-Me-And-My-Friends-Insert-Sailor-Moon-Fanfiction turned into an Orignal-Fic-Sandbox-Plus-Lego-Block-Worldbuilding-Extravaganza.
Which actually sums up what happened really well, though considering at this point the very first bit started in March 1999 at the age of 14, and my last major retooling happened in March 2009, just before I entered my current fandom in full force. So from the original idea to the latest incarnation, there's been approximately 10 years, through which I've graduated middle-school and high-school, earned an Anthropology degree with some fun forays into Medieval Literature, Japanese, Psychology, and Plant Biology among other subjects, played way to much of an MMO, met someone and got engaged to him, enrolled in a Graduate program. Fandom-wise, I moved from Sailor Moon, to Fushigi Yuugi, to Kingdom Hearts, to Final Fantasy X/X-2 with a few other minor fandoms interspersed here and there.
So, in other words, there's also a personal history that developed between the original fanfiction and the latest incarnation, that by necessity will show up behind the work.
( Cut for ramblings about old stories and new ones that will never end. )