In the fanfiction, the pregnancy could be a symbol of a new beginning for the relationship between Jareth and Sarah. It forces them to re - evaluate their feelings for each other. Sarah might become more empathetic towards Jareth's loneliness in his magical world, and Jareth could start to understand the importance of human emotions. They could embark on a journey to find a safe place for their baby to be born, facing various challenges along the way that test their love and commitment.
Perhaps the pregnancy is a result of some magical mishap. Sarah then has to deal with not only the physical changes but also the strange magical implications. Jareth could be trying to find a way to reverse it at first but then grows to accept it as their new reality, which would create a lot of drama and character development.
Well, a plot could be centered around how the two deal with the reactions of their respective worlds to the pregnancy. Jareth's world might not accept a half - human child easily, and Sarah's family and friends in the human world would be shocked. They could go on a journey to find a place where they can raise the child in peace. Also, the pregnancy could trigger some latent powers in Sarah that she didn't know she had, and Jareth has to teach her how to control them.
One interesting plot idea could be that Sarah, years after her initial adventure in the Labyrinth, finds herself drawn back in a strange dream. In this dream, Jareth appears more vulnerable than she remembers. She discovers that there's a dark force threatening the Labyrinth and Jareth needs her help. They have to work together, and along the way, they start to understand each other on a deeper level, perhaps even developing feelings for one another.
The relationship might become more intense. With the pregnancy, they have to rely on each other more. Jareth may show his softer side as he takes care of Sarah, and Sarah might start to see him in a new light, beyond the intimidating Goblin King.
You could write a story where Jareth is in trouble and Sarah is the only one who can help him. For instance, he has lost his magic powers due to a curse, and Sarah, having learned a lot about the Labyrinth since her first visit, uses her knowledge and courage to find a way to restore his powers. Or perhaps there is a new, more dangerous Labyrinth that has emerged, and Jareth and Sarah must navigate it together to find a way to stop it from spreading and causing chaos.
Yes, there might be some out there. You can try searching on popular fanfiction websites like Archive of Our Own (AO3). They have a large collection of various fanfictions, and you may find some related to Jareth and Sarah in a pregnancy scenario.
Perhaps a plotline where they have to deal with the differences in their worlds. Sarah comes from the human world and Jareth from the magical realm. Their married life could be about finding a balance between the two, like how they decorate their home, half with human items and half with magical ones.
There might be a fanfiction where Sarah has to team up with Dark Jareth against a common enemy. They start to understand each other better during this adventure. For example, they face a powerful dark force that threatens both their worlds.
One interesting plot could be that Sarah, after being kidnapped, discovers a hidden side of Jareth's kingdom that he has kept secret from everyone. She finds out that there are other captives there who are being held against their will for reasons she has to uncover. As she tries to escape and free the others, she starts to see Jareth in a different light, not just as a captor but as a complex being with his own motives and past traumas.
In fanfiction, the idea that they come from two completely different realms, the human world and the Goblin Kingdom, adds to the allure. Their relationship can be seen as a bridge between these two worlds, and how they navigate the cultural and magical differences is fascinating. For example, in some stories, Sarah has to learn the ways of the Goblin Kingdom to be with Jareth, and Jareth has to understand human emotions better. This dynamic makes for a rich and engaging story.