Under Guardian {Undertale Sans x Angel Reader}

Yep this is my AU. It is not really an AU it is just a different time line. Frisk will be a boy in this book. And yes this is my first x reader book. Undertale belongs to Toby Fox. So, enjoy.

(Y/n) was a forgotten angel on earth. You always helped people, either in human or in spirit form. One day you were walking with an old lady across the road when you saw a kid being bullied. The child was about 8 or 9 years old. He had short brown hair and had a blue sweater that had two horizontal purple lines that went across. You quickly used your magic and helped the child. But something happened that day that changed you forever.

"I promise to be your guardian angel."