Their relationship would likely become more solid. Having a baby together means they have a new shared responsibility. They would have to rely on each other more, like when taking care of the baby at night or making important decisions about the baby's future.
One possible plot could be that Elsa and Hans, after many challenges and reconciliations, decide to start a family. Their baby might inherit Elsa's ice powers in a unique way, like being able to create ice sculptures just by touch. And they would have to protect the baby from those who might fear or want to use the baby's powers for their own gain.
One possible story could be that after many trials and reconciliations, Hans and Elsa find a common ground. They might start off as enemies, but over time, they come to understand each other. Elsa's ice powers could play an interesting role in the pregnancy, like creating a special, safe environment for the baby. And Hans could change his ways, becoming a more loving and protective partner and father.
It might start with a chance encounter. They see each other in a new light and gradually start to develop feelings. Their relationship develops as they exchange kind words and small gestures of kindness.
It would become more committed. They'd have to work together to take care of the baby. Hans might become more protective, and Elsa would be more nurturing. Their focus would shift from their own issues to the well - being of their child.
Anna would be a likely candidate to rescue Elsa. She loves her sister deeply and has shown great courage in the past. She would stop at nothing to find and free Elsa from Hans.
Anna could be the one to save Elsa. After all, she has proven herself brave and determined in the original story. She would stop at nothing to rescue her sister from Hans's clutches.
In Elsa and Hans love fanfiction, often there is a lot of character development. Since their initial relationship in the movie was so rocky, the fanfictions usually focus on how they overcome those initial negative impressions. For example, Hans might be written as having a change of heart more thoroughly and Elsa learning to trust again.
Well, one possible plot could be that Hans has some hidden motives for kidnapping Elsa. Maybe he wants to use her powers for his own gain, like ruling Arendelle through her magic. He could hold her in a secret location and try to force her to cooperate.
One possible plot in this fanfiction is that Hans kidnaps Elsa not just for power or revenge, but because he is being controlled by some dark magic. He takes Elsa to a remote location where she has to fight not only Hans but also the source of the dark magic to free herself and save Arendelle. Along the way, Elsa might discover new aspects of her powers that she didn't know before.