I looked, and no that's not it. The story I'm looking for is completely made up (no historical context at all)... it's just that the one culture is reminiscent of Roman society in how it is organized/described.
Also, I don't think the story was actually on any mass e-reading sites like this. I think it was a site the author made for his/her writing. I could be wrong on that point though. I don't remember it being on any of the usual sites (awesomedude, gay authors, nifty, etc) though.
And yeah, I've been trying tonnes of google searches, but I can't remember exact names or anything like that, so I haven't been able to find anything.
I do remember there being quite a bit of drawn art online back when I read this of the two main characters (the fair skinned/haired officer from the Roman-like society, and the dark hair/tan skinned young man from the native-like society. If I could rememnber their names I could probably find the story, but I'm drawing a blank and it's killing me.