A Strange Alliance: A DustSwap fanfic

Trying to make a proper Dustberry/Murderswap/Dustswap story now.

Everyone deals with the madness of the multiverse in different ways. Some just avoid it or watch from a distance, like Outer or any bystanders of AUs that the trouble intrudes. Some cause trouble like Nightmare's gang and then there's those that try to prevent it like the Star Sanses...Well, that's how it SHOULD be. Many consider it simple like that where none of these three groups overlap. The two sides fight and the bystanders stay away. But...Swap consistently contradicts this system. He hangs out with "bystanders" in other AUs when outside of battle and if not for being part of the Star Sanses, would be a bystander. He befriends Error and Horror or the "enemies" and tries to keep Dream or Ink out of trouble. So when Swap goes missing, Error quickly jumps into action and gets the gang to help him. It lands Dust and Swap into a strange situation and is stuck together, forced to be on the same side. What would this alliance reveal to them when the divide is broken down between them? Read to find out.