Great conclusion, Wendy!
As mentioned above, I like that you made Clark's return to life very low key. It's about on par with all his other lame excuses, so I figure Perry and company would buy that one, too.
One note about timing, though this is a very small nitpick. Having experienced a lot of west coast to east coast travel, it's really hard to see Lois reaching the Daily Planet before evening, perhaps 8PM. Not impossible, but not likely. I'm not sure why Lois would have expected anyone to still be at work from the normal day shift. I guess she could have taken a red-eye, I suppose.
He turned his head in the direction of the elevator, and saw her.
Lois.
He shook his head frustratedly. He really was in a bad way! Missing her so much that he imagined he was seeing her.
I like this. It parallels what Lois experienced in "Lord of the Flys" when she kept thinking she was seeing Clark everywhere.
And this was something he hadn’t thought about. Lois lived in LA now, and Superman wasn’t within reach. So who would rescue her when she got into danger? Who would protect her when she took the crazy risks which he was sure had already taken at least a dozen years off his life?
Makes a lot of sense. LA's a tough place. lol at the dozen years off his life. What about hers?
“Here.” He held the paper out to her. “This should explain it.”
I'm glad you had Clark explain his "resurrection" by pointing to a newspaper rather than by lying to her outright. It would have made his telling her about his Superman identity much more awkward.
“Lois, you can come back!” he began, again trying to tell her the truth. “If the only problem is people associating you with Superman, that’s a no -”
“I love you,” she said hesitantly, quietly.
“ - brainer! I’m Superman, Lois... What did you say?”
“I love - ” She broke off abruptly. “Did you say that you’re *Superman*?”
Now this is a great way for the double revelation! By doing it simultaneously, Clark won't feel Lois loves him just for being Superman. Lois won't feel that Clark's telling her he's Superman just because he feels he's obligated to because she told him she loved him. Brava!
A red mist began to appear before her eyes. Was that it? Had he not told her the truth so that he could get rid of the competition?
I'm glad Lois didn't carry through with her typical fly-off-the-handle behavior and thought about it. If she had, this would have been much longer than 4 parts.
Instead, she let Clark explain himself, and she realized that her own behavior contributed to his actions.
And, she realised suddenly, if he had told her the truth six weeks ago and asked her to stay as Clark Kent’s girlfriend - the solution he’d offered her just a few minutes ago - he’d probably have come to resent her in time in the belief that it was Superman, not Clark, she really loved.
I guess Martha wasn't as persuasive as I thought she was. He still believes Superman isn't real, while Clark Kent is the real him, even though he was going to LA to convince her to come back.
“You did the right thing,” she told him suddenly.
Wow. Very brave of her to say this. And probably very true, given that Clark wasn't convinced by Martha that the true Clark was a hybrid of his two identities.
“You know,” Lois said sweetly, interrupting him once more, “I think we’re wasting valuable smooching time here.”
Yay! "Smooching!"
Fun! Thank you Tank and Wendy for a delightful short story. LaurieD
Perfect ending, and a very clever solution to Tank's mess, Wendy. Not get the next challenge out. 
Wendy, 
James
Wendy! <happy sigh>
- yes, Anna, that's exactly the point. <g>
- but I think I can promise that we'll be back in due course with more challenges.