If you want to stay more true to canon, I guess you could write the story where Lois is UW without Clark knowing, perhaps she got his powers during a "Bolt of Blue" moment and didn't tell him that a) she now has powers, and b) that she knows CK=SM.
Hmm. Very interesting idea. Though it would make more sense to me if it happened in a chip-off-the-old-clark fashion, perhaps before Lois ever even met Clark, and he was just surreptitiously helping out on something. Then by the time they do meet, they both have secrets to protect.
Unfortunately, my dance card is full on the stories-to-write front. :p But I'd love to see someone write it!
