Yandere Killer Sans X Idol Female Reader

(Hello guys!I'm finally here!before you read the story please read this:
1)May contain 18+ stuff like bad words,some "light" lemons,blood,violence ec ec.so pls if you aren't comfortable with those just don't read the book.
2) I'm not English so the book can contain grammatical errors.
3)do not critize me and the others creators,we are doing our best to fantasize and write the stories,you can suggest them things.
4)the drawing Is mine,do not steal It,you can save and use It but plz give me credit,I have proof that I did it on my YouTube Channel,you can visit my YouTube Channel :3,it's Melly G.
5)this is a fanmade book,I'll try to do my best on how Killer would react to YN and the others,none of all of this Is canon and I know most of things of Killer Sans.
6)it's my first book,hope you'll like it.ಥ⁠‿⁠ಥ
7)Killertale do not belongs to me,it belong to the respective creator Rahafwabas.

Prologue:

YN is a Idol girl at school,lot of people loves her appereance,look and songs,she have a group wich one she is friend too,they are like family to her(naturally all females),as the singer everyone knows her well and become famous at school and a very popular girl.
A year passes and she is at the second year of school and she meet a new student,his name is Killer Sans and here...everything changed for YN...