Question of the day to writers

So I've been working on my fanficcy...thing. And, as often happens when I'm writing, I get curious about other people's processes. Those of you that do fics (within the same show/fandom), do you ever try to maintain a personal canon within your own stories? Or is each story separate and complete irrespective of what you've done anywhere else?

I'm not talking about creating a series or anything, but do have events from other stories in mind and do you try to keep whatever you write consistent with what you've written in the past? I'm only on my second story ever and I've found myself almost unconsciously making a tiny little tie or two between it and my first. Not plot specific ties, just something that I know is there even if it doesn't matter to the story or if no one else sees or cares about it. I can imagine that if you've got a critical mass of stories in your portfolio it would become difficult if not impossible to have them all relate to each other.

So what say you? Is each story that you do:

A: A separate and distinct entity unrelated to your other stories?

B: A piece of an organic whole along with the other stories that you've written?

It's purely idle curiosity on my part, I just wondered if anyone had any thoughts on the subject.