I don't have time to scare it up right now, but Livia Balaban, in XF, wrote a Happy Ending story set after Requiem. It's called Cunegund's Restoration, I think, and it's great fun. She did it as a challenge to herself.
Livia's got a bunch of very funny stuff, including two hysterical meta-fics about Mulder as a ficwriter in the mythical SETI Troopers fandom (which bears a striking resemblance to Enterprise).
Livia's fic. She's written some absolutely hysterical stuff. I'm fond of her angsty XF fic as well, especially "The Myth of Silence".
A show with a happier background (and I'm guessing that dueSouth may have that, without having watched it), is easier to write happy fic in.
This is the only fandom I can think of where I've written what I guess could be classified as happy-fic. But even then I try to be realistic about my schmoop.
This isn't to say most of my stories are dark. They more tread the line between the two, waver on the tone of the story so it could go either way.
I think. It's hard to judge your own stories, because you have a natural bias on how you've written them.
Oh! I'm not big into X-Files fic, but "Cunegund's Restoration" is my favorite of what I've read. It's actually what gave me the idea for the Farscape fic I'm currently wrestling with.
In other fic-world news, the April Fool's Day version of dymphna.net is really, really fucking funny.
t tangent
Someone reassure me that if I AM going to a Special Hell for reading Snape/Hermione (where she's always over the age of consent) smut, that there will hopefully be other people there I like and get along with?
mmmm, Snape.
t /tangent
Sorry, Alan Rickman is nummy, I don't think Snape is. You're on your own.
He looks like an older and more bitter Trent Reznor (from the band Nine Inch Nails). That, combined with The Voice? ElderGothGirl heaven.
an older and more bitter Trent Reznor.... combined with The Voice
Mmmm.... I'll be in my bunk.
(which I s'pose more or less proves Jilli's point.)
My Special Hell concern isn't that's it's Snape, but Hermione.
I like slash, but I want to read het Snape fic. Snape/Lily would be splendid. (Looks in FayJay's direction.)