Well, first of all, Elijah would be by Elena's side all the time. He would help her with her daily needs, like getting things she needs or helping her move around when she becomes less mobile during the pregnancy. He would also share his knowledge of the supernatural world with her, so she can better understand what might be happening to her and the baby, and together they can prepare for any challenges that might come their way.
In this fanfiction, Elena's family may initially be shocked, but then quickly come around to support her. They could start making plans for the baby's future, like setting up a safe place to live. Elijah's family might have a more complex reaction. The elders might see the pregnancy as a sign of change in the family's power structure. Some younger members could be excited and look forward to having a new family member, while the more conservative ones may be skeptical and try to interfere in the pregnancy for their own reasons.
The Salvatores would probably be shocked. Damon might be initially angry, thinking Elijah has taken advantage of Elena. Stefan, on the other hand, would be more concerned about Elena's well - being and the implications of a half - vampire, half - something - else baby. He'd want to make sure she's safe.
In an 'elijah and elena pregnant fanfic', Elijah and Elena are the main characters. Elijah might be the one who takes on the role of the provider and protector even more so during Elena's pregnancy. Elena will be dealing with the physical and emotional changes of pregnancy. Their friends and family, though not the main characters, may also be involved, such as Caroline or Klaus who could offer advice or create some sort of conflict in the story related to the pregnancy.
One possible plot could be that Elijah and Elena find out about the pregnancy unexpectedly. They then have to deal with the reactions of their friends and family. There might be some who are happy and supportive, while others are shocked or even against it. They would also need to figure out how to prepare for the baby, like finding a suitable place to live and getting all the necessary baby items.
Another common theme could be the emotional journey of Elena during the pregnancy. She may have fears, hopes, and dreams for the future with Elijah and the baby. The story could explore how their relationship evolves during this special time, with both characters growing and changing as they prepare for parenthood.
They might also face a lot of internal conflict. Elena may struggle with the idea of having a child so young, especially considering the chaos of the supernatural world she's in. Elijah, on the other hand, might have his own doubts about whether he can be a good father given his vampire nature. This could lead to some tense moments in their relationship.
One interesting plot twist could be that the pregnancy is a result of a magical spell gone wrong. Maybe a witch with a grudge against Elena cast a spell that made her pregnant with Elijah's child against their will. This would add a lot of drama as they have to figure out how to reverse it while also dealing with the reactions of their friends and family.
I really like 'Elena and Elijah's Uncharted Journey'. This fanfic takes them on an adventure outside of Mystic Falls. It has a lot of great dialogue that makes their connection seem very real and deep. The author does a wonderful job of building the story around their relationship.
Love is a very common theme. Their relationship, whether it's a budding romance or a deep platonic love, is often explored. Another theme is the idea of sacrifice. Given the complex situations they are often in, one or both may have to sacrifice something for the other.