Love Is Unnecessary (Underfell Sans X Reader...
"C'mon, the rumors have to be fake!" They told you. And....you believed it. So here you are now, and the top of Mt. Ebott, with friends who weren't ever your friends. One fight. One little fight at the peak sent you down, down, down. What happens next, you never would have guessed.
(The cover isn't mine, even though I edited it. Undertale/Underfell isn't mine either, and any characters that appear in this fanfiction aren't mine.)