Playing with own characters is definitely a good thing. I've enjoyed how you've tried to do that withing the confines of fanfic, but it would appear that a lot of readers aren't keen on original characters. So yes, you probably have stretched the medium to its limits.

Captured is a lot like original fic, you're right about that. Though my original Roman novel is something quite different. For one thing, it has a female lead, which is a first for me. But then again, there is a slash aspect to it, of course. *g*

I'm so glad you liked the Sparrington fic - I didn't really think you would, since the fandom didn't seem to interest you. I'll send you the new fic sometime next week, and you can take it to pieces for me. It has potential, I think, but could probably be better.