Another fanfic comes to mind, of course - it's Erin Klingler's The Accidental Husband . Lois is getting married to Lex in 2 weeks (for the sake of the fic, all the stuff about blowing up the Daily Planet never happened) but it turns out that she's already married - to Clark! Neither of them knew it - how could it have happened? Really fun fic to read, with a lot of character insight.