Hmm, seeing as the section "Stories" is under fanwork, I'd post it under "Whodunit?" instead.
But it'd be really interesting to see what happened if you posted a story on DCW people! (I wonder who would be paired with who. Even though I gave up on love for myself, I still like knowing who-likes-who)
I'd post it on both and ask the mods if it was okay in the Stories section. If the mods think it is unrelated, the'll either lock it or move it. That's probably the safest way.