I don't recall there being an author's name and I don't think any of the characters were named, though for some reason I get the idea that the guy's name was Jack, it was written either first or second person, and it was fairly short. There was this whole thing about how, um, something like "the worst fear is that the people you care about don't care about you" and the protagonist runs to her friend, and they hug for a second, but then the friend isn't reacting normally he's just standing there, and she looks up, and he's like "something something something, I'm really a demon, I don't even care about you" and then he kills her. And I think it was mentioned at some point that they were friends since childhood but I won't vouch on it.