Hey guys. I'm searching for a fic, but I only remember the showdown.
It involves Clark confronting Lex, they fight and I believe Lex throws Clark out of a window. I'm not quite sure, but it may be one of the fics exploring what would have happened if Lois had said yes.
There was definitely kryptonite involved.
I know this isn't much to go on. But I know you guys have found fics on less. So I thought I'd give it a try.