Sonotale story

Sonotale is a story when the war is happening Papyrus was a kid back than and the main reason why the AU is as it is, WingDing aka Gaster the cousin of Sans and Papyrus was working on a machine that can do stuff with timelines but a war happen so Sans and Gaster was thinking of a way to stop it but Gaster forgot to get the book that was for make the timeline machine so Papyrus try to build the machine himself it fail kinda when the machine was done it blow up luckily Papyrus survived the explosion but something went wrong... Gaster and Sans wasn't acting like them selves no one was acting right but Papyrus was just normal.