Sans X Depressed!Reader

Y/n fell into the underground when she was 13. When she 1st fell Chara tried to convince her to be her "friend¨ but Y/n, being smart, disagrees. Chara becomes angrier as Y/n keeps sparing everyone. Chara knows Y/n isn strong enough to leave the unground by herself yet,so she has 5 years to get into Y/n's mind, to br...