I forgot to recommend one fanfic which is tangentially related to "Soul Mates". It's ML Thompson's fine
Oops: The Destruction of Utopia . As the description says, "Lois and Clark leap into their past -- a perfect chance to make things right. There's only one little problem: if they change anything, Utopia could be destroyed. Will they figure things out in time or is this the end of Lois and Clark? "
You'll have to read the story to learn how it relates to "Soul Mates" - it would be a spoiler if I told you.