Everyone has made good points about the "soul mates" theory and I won't bother to put in my $0.02, except that I enjoyed reading everyone's comments.
Fanfic-ly speaking (if that's a word), there are several fics based on this episode/concept which I enjoyed. Of course the first must be Nan Smith's
"Home" series. Here, Lori Lyons *is* Lois Lane's reincarnated soul in the 21st century. Clark, of course, hasn't aged physically. Here's the setup:
Fifty years before he had retired from the super-hero business knowing the world was in good hands with his children and grandchildren, so that he could spend more time with Lois. They had both known that he would outlive her. In the 79 years of their marriage, he had not perceptibly aged at all. Lois had aged more slowly than a normal human, probably because, Dr. Klein had told them, of the effects of his aura on her, but her appearance had slowly changed as time went by, and he had chosen to spend the time with her. They had seen their grandchildren born, and then their great-grandchildren. And then the time he dreaded had come at last. He had lost his beloved wife at the age of 108.
He'd expected to *feel* her disappear, as she had before when she had gone into the parallel world, and knew that when that happened he literally could not live without her.
But she hadn't. Her presence was still there, somewhere. He'd believed for days that he must be going insane from the loss of Lois, that his mind was playing tricks on him. But the feeling hadn't changed, and slowly he remembered the thing that H.G. Wells had told them on their wedding day.
Their souls were intertwined, always together. Wherever his was, there was hers, two lovers destined to meet and fall in love over and over again throughout time. As long as he was alive, she was there, too. Somewhere.
For more than twenty years he had been waiting and searching for her, and now here she was.
The series starts with
Home and goes on from there. Don't miss this fine series.
There are two fics about Lady Loisette and Sir Charles listed in the Database:
Lady Loisette & Sir Charles: The Adventures of Soulmates by Dawn, and
Somewhere In Time by Rachel Young. I haven't read them so you're on your own here.
I always enjoy LaraMoon's fics, and her
Mated Mishap is part of the "Clark Kent is Batman...Not!" series. "What if HG Wells' Soul Tracker had seriously malfunctioned and our favorite couple had found themselves transported inside an entirely different couple altogether? Let's say... a certain couple from Gotham City, for instance?"
Regarding the curse: Tank Wilson and Wendy Richards have an interesting take on it in
Mori A Amor . Fun to read, as are all their collaborations. Tank sets up one of his patented Tank Endings (although, thankfully, in this case it's a "middle" and not an "ending"):
Klein bit his lip. "It's my considered opinion, that if you two ever make love again, Lois will die."
Speaking of their wedding night, Kathy Brown wrote
Definitely The Black about a certain item of lingerie:
At the beginning of the episode, our favorite couple is about to fly off to Hawaii when Lois realizes that she's forgotten one of her bags at home. As incentive to get Clark to retrieve it, she informs him that "it has that black teddy you bought for me in it". The look on Clark's face as he *immediately* zooms off to get it is priceless. <g> This is the story of that teddy.
