Their relationship would likely become more intense. With a baby on the way, there's a new level of commitment. Damon might become more tender and less reckless, as he now has Elena and the unborn child to think about. Elena would probably rely on Damon more, trusting him to protect her and their future family.
Well, in such a fanfiction, Elena might befriend Lissy and Josie. Maybe they'd share stories about the supernatural world. Since Elena has her own experiences with vampires, werewolves and witches, she could offer them some unique perspectives. And they could also help Elena adapt to the new environment she might find herself in.
She could be terrified at first. After all, Klaus is a very powerful and dangerous vampire. But Elena is also a strong - willed character. So she might quickly gather her courage and start looking for ways to escape.
Elena would likely be angry. She has her own agency and doesn't like being controlled. If Stefan kidnapped her, she would fight back. She might use her knowledge of the supernatural world and her relationships with other characters to try to escape. For example, she could try to call out to Damon telepathically if they have some sort of connection in the story.
One idea could be that they face challenges from the vampire and werewolf communities. Since their relationship was already complex in the show, this pregnancy could stir up more trouble. Another plot could be them trying to keep the pregnancy a secret while preparing for the arrival of the baby. They might have to deal with issues like finding a safe place to raise the child in a world full of supernatural threats.
Well, a possible plot is that Elena's pregnancy is the result of a spell gone wrong. Klaus, despite his initial shock, decides to stand by her. This could lead to a series of events where they have to fight off those who see the baby as a threat. It could also explore how Elena deals with the physical and emotional changes of pregnancy while being in a rather strange relationship with Klaus. And the baby might have some unique abilities that are both a blessing and a curse.
One possible storyline is that Elena helps Lissy and Josie with a school project related to the history of the supernatural. Since Elena has lived through a lot of it, she has first - hand knowledge. Another could be that they go on a road trip together and encounter various supernatural beings along the way.
Their relationship would likely become more complex. Klaus, who is used to being in control, might become more possessive yet also more tender towards Elena. Elena, on her part, would have to rely on Klaus more, which could create a strange bond between them. They would have to learn to trust each other in a whole new way as they are now responsible for the unborn child.