Pain doesn't always win: Underfell sans x abused demon reader

Lily Southerns thought that life couldn't get any worse, after being abused and hated by everyone for the past 8 years. Thinking that she has no purpose of living, she stopped caring about herself. After being kicked out she meats the one person that turns her life around and helps her see she matters, but what will it take to do that, read to find out