Let me tell you a lil story in order to help you figure out this story. Millions of genocide routes have been done and completed sans became insane and wanted revenge on the human. In order to do this he needed to kill other monster..... Including his own brother sans confronted his brother about this and papyrus didn't like it so he kept running until sans got tired and had enough of him speaking about this plan and papyrus acedintly killed his brother. Now that you know the introduction let's continue.
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Dustbelif au fan fiction
Horrordustbelif is a swap au of og dusttale in this au papyrus acedintly killed his sans in self defense read to find out how the story goes