I can't remember the name, I guess you could say it was fanfic, but it was good, clean fanfic. It was about a Hunter that could still think rationally, even as a zombie, and it was trying to help a survivor. I think the survivor was a girl, not sure. I'm pretty sure I read it on the Steam forums, but I'm not positive about that.
I'll have to check this topic when I get home later, so thanks beforehand.