I think I'm going to delete futurerune, It's not going anywhere, and there's beginning to be another popular AU with the same name. Heres how the story was supposed to go:
Kris, Susie, Berdly, All become robotic
Sans shows up and aparently survive.
Sans owned the bunker and is pissed at everyone for using it, and the fact that it killed Papyrus.
Sans hires two children who like to jump from different AU's (who ended up being Asher and Willow in their child-like forms) These two kids, Spamton, and Sans all team up to try and kill the lightners for what they did.
Eventualy, they succeed. Sans, Spamton, and the two children work together to repair both worlds.