Quantumtale (Quantum Sans x Quantum reader)

Prologue

So (y/n) was a kid who believed in monsters. (Y/n) is friends with Frisk. You were in show and tell with Frisk and they were showing their adventure in the underground. There were two boys who were making Frisk upset by not believing in them. But you butted in and said you believed and that's how you and Frisk met and ever since you two were best friends. One day both of you were walking home.... and that's where the story begins.