There was once a human who Asgore couldn't find in his heart to kill. She won the hearts of many monsters but those still stricken with anger from the royal guard sent her to Asgore. They had to listen to their king... Right? The child won Asgore's heart and the human was spared. She didn't want to leave, either. Asgore put this child under the royal scientist, Gaster's care. ~~~ So this is a Skeleton Family thing. So the human is adopted and my headcannon for Gaster is that Papyrus and Sans are his sons so... those guys are her brothers. This is an Xreader, I'm putting art (some will not be mine) to follow it. I'm sorry if you ladies don't look like the girl on the cover, she's what I pictured when I began this. IN THE PROLOGUE YOU ARE A VERY YOUNG CHILD 4-5! DURING MOST OF THE BOOK YOU ARE 6-7! WHEN YOU MEET FRISK (much later) YOU ARE 20!