I'm far too lazy to do all the proper cuts, so this is going to link to fanfiction.net. Sorry. :]

Fidélité
Chapters 1-11

Characters: Charlie, Aaron, Desmond, Hurley, Jack, Sun, Kate, Sayid, Claire, Ben, Juliet, Others, and a few other appearances.
Rating: PG-13
Setting: Beginning of Season 4
Disclaimer: I wish I had some control over what happens in Lost. But I don't.
Summary: After a tragedy, there is much dispute over who will be taking care of Aaron. Fidelity, although proven to be fatal, is the commitment between two lovers. And Charlie plans to respect that.

(“Hey man,” Hurley said into his walkie-talkie. “You should really try the other frequencies and see who else you can get a hold of.”)