Underverse self insert Includes Y/N's that might actually make sense REWRITE

Read Disclaimer for more!! Enjoyy *Mwah*

Our beloved Monsters live at the surface for almost a year now. As Christmas time begins, they are all overwhelmed by the festivity and happiness this time of the year brings to everyone. And monsters realize: it's been a long time since they celebrated a family festival under the stars. This is basically a small collection of one-shots that play in the same universe. It will work like an Advent calendar, which means there will (hopefully) be one chapter per day , until it's Christmas eve. Please understand that I am not a native English speaker, so if you find any grammatical errors or typos just point them out to me. I will gladly correct them and learn for the future.

It's kind of a Sans x reader. I named the character. Oops. Welp, here we go! This has potential I promise. Just give it a chance. Please.

Description is in the Disclaimer! <3

COMPLETE *This story takes place after an ending in which everyone is alive but they cannot reach the surface*

Truth or dare with Toriel, Sans, Papyrus, Undyne, Alphys, Asgore, Flowey, Napstablook, Mettaton EX/NEO, Asriel, Frisk, Chara and TeMmIe!!!

the third child that was given to XGaster.