I looked for fanfics on AO3 and I'm disappointed there aren't that many compared to killing stalking so I'm writing to contribute, though I'm extremely slow about it. ( ̄∇ ̄")
Uuuh for ideas, I'm not really sure. Maybe explore why Sungho feels disgusted by sex then does things that contradict that? Or maybe Dohyun and Sungho doing cutesy stuff in high school?
I think AUs are especially cool to think about for Warehouse because of the snake doujinshi that already exists. Exploring ideas of how Dohyun and Sungho can meet in different circumstances, feel that instant connection...and ruin everything for themselves all over again in new and exciting ways, because that's their fate.
Yeah, me too. It's similar to KS (better imo) so I think there are lots of stories that can be written about Warehouse. I'm cheering you on, rottenpeach!
I agree about AUs being good for Warehouse. The doujinshi was really interesting because of that. Maybe a selkie AU where Sungho takes Dohyun's sealskin? Or, I like wingfic, so some AU where Dohyun has wings.
Or a role reversal AU. There have been a lot of fanart/art with that. You'd just reverse the dynamics with Sungho forgetting about Dohyun in high school but Dohyun growing more obsessed with Sungho until he ends up kidnapping him.
Thinking some more about fic ideas...
What about a role reversal crossover? Where Dohyun from the canon universe swaps with the Dohyun from the role reversal universe? So you'd get obsessed!captor!Dohyun/captor!Sungho and captive!Dohyun/captive!Sungho. They would have some pretty interesting interactions.

Has anyone ever thought of writing fanfic for Warehouse? What kind of ideas do you think would be cool to explore in fic?