Ok I don't remember much about this fic but I really want to re-read it. It was a AU fic where for some reason. Fili Kili and i believe Thorin were sent to stay with Bilbo at the Shire. One of them was supposed to marry Bilbo but he didn't know that. They thought Bilbo was evil and would try to sleep with one of them so they were always wary of him and Bilbo didn't understand why they were so jumpy around him. It finally comes out they think he's gonna use one of them for sex and Bilbo get's really upset and wonders what he did that would make them think he'd do something like that. They feel really bad afterwards.
I think it ended up Bilbo/Thorin and maybe Fili/Kili
The Hobbit Fic Finder
- Arranged Relationship Misunderstanding Fic?