What a fabulous idea for a story. And I think you've picked the perfect episode to set it in, too. With Clark's investigation into Snell and Intergang, there are plenty of people out there who could want him gone. So it makes perfect sense that Lois would get worried when he disappears.
I like how you casually drop where Superman is, just so the reader knows that Clark is fine, just otherwise occupied. But, of course, Lois doesn't know that. Could this be the encouragement she needs to get to "There's more to our relationship than just friendship" a little early? I won't deny I'm hopeful.
More, please!
Kathy