This story is old and the big ew. Please don't read until I change the bio or I will commit slip n' slide, sauce on the side, sewer slide.

You are about 15, Gaster is 17. In this Gaster is an older brother to Sans and Paps. Asriel is about 6 along with Frisk and Chara, who show up later. You and Sans are best friends, but Gaster is amazing! At age 17 he is the royal scientist and you hope you can help him out.

When the monsters were sealed in the Underground, a few humans, still loyal to monsterkind, went with. (Y/N) Was one of them. She was a Scientist, one of the most brilliant minds of the monster world, and ended up working alongside the Royal Scientist. W. D. Gaster. And, despite her knowing better, began to grow attached to the mysterious Scientist... °°° *Does Potato Dance* dippity dee, fanfiction from me! (Get ready for some cringe, but with proper punctuation and spell check! XD) This is my first x Reader, so advice is always appreciated! Oh, and for my sinners out there, a lot o' foreplay is in order. STAHP MORAL PEOPLES ?-( ͡° ͜ʖ ͡°)-?? Enjoy the read! Potato Forever, LilPotatoTrash

*This book will take place during the comic by deadpool4ever at Tumblr.* I would suggest the dub by two all nighters on YouTube. :3 I'll put it up there. You are papyrus' teacher at the snowdin school in the underground. and yes you are a human. but why would they keep you alive if you are human. the thing was, you didn't have a soul. but you did have a brain. a very good one in fact. you were caring for all your students. enough to become a certain little skeleton's favorite teacher. and Enough to bond with him so much that you get to meet his dad. W.D Gaster.