My memory's foggy -- I wouldn't have remembered that L&C-as-teenagers idea (and somebody ought to write that, actually, it could be cool). I do believe there was going to be another alternate-universe fic, wherein alt-Clark is reunited with alt-Lois, but I don't remember any details of how they planned to achieve that.

Anyway, as fifth seasons go, I think the fans did a pretty decent job -- I've heard a lot of people say TUFS (the unaired fifth season) was their first introduction to L&C fic, and S5 (Season 5) was going so well we did a sort of half-season for S6. You can find them all on the archive, under "themes," I think.

PJ
who also has the fancy formatted multi-media versions of S5 & 6 on her website , but wouldn't want to boast...

"You told me you weren't like other men," she said, shaking her head at him when the storm of laughter had passed.
He grinned at her - a goofy, Clark Kent kind of a grin. "I have a gift for understatement."
"You can say that again," she told him.
"I have a...."
"Oh, shut up."

--Stardust, Caroline K