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.
Another plot twist could be that the baby has some sort of special power. Since Elijah is an original vampire and Elena has her own unique connection to the supernatural world, the baby could be a hybrid of some sort. For example, it could have the ability to control both vampires and werewolves, which would make it a target for many in the supernatural community.
Perhaps a plot twist could be that Elena discovers she's pregnant, but Elijah has lost his memory due to some dark magic. So, she has to deal with the pregnancy on her own while also trying to find a way to restore his memory. This would add a lot of emotional turmoil to the story.
One plot idea could be the challenges they face in keeping the pregnancy a secret from their enemies. Another could be how they prepare for the arrival of the baby in a world filled with supernatural threats. For example, they might have to find a safe place away from the constant power struggles in their supernatural community.
Often, there's a plot twist where the baby has some sort of special power or ability that no one expected. This then makes the baby a target for all kinds of supernatural forces. In some fanfictions, the pregnancy also causes a rift between Klaus and Elena, as they have different ideas on how to protect the child. And then, suddenly, a long - lost relative of Klaus or Elena shows up, claiming to have a solution to all their problems, but with their own hidden motives.
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.
One possible plot twist could be that the baby has some unique supernatural powers that neither Elijah nor Klaus expected. For example, it might be able to control time or have the ability to travel between different dimensions. Another twist could be that there is a prophecy about this baby that endangers its life, and the characters have to fight to protect it from various forces that want to use or destroy it. Or perhaps, the baby's true father is revealed to be someone else entirely through some sort of magical or scientific discovery.
One possible plot twist could be that a long - lost relative of Elena shows up to oppose the marriage. Maybe this relative has some ancient grudge against the family that Elijah is from. Another twist could be that a powerful witch casts a spell on Elijah, making him forget his love for Elena right before the wedding. Then Elena has to go on a quest to break the spell.
Well, one plot twist could be that the father of her baby is not who everyone suspects. Maybe it's a character who has been secretly in love with her all along. Another could be that there are some supernatural elements affecting her pregnancy, like a curse that changes the nature of the baby.
One possible plot twist could be that the pregnancy is part of a magical spell gone wrong. Maybe a witch with a vendetta against either Kol or Elena cast a spell that made Elena pregnant, and now they have to figure out how to reverse it without harming the baby or themselves. Another twist could be that the baby has some sort of special power that attracts all kinds of supernatural threats, forcing Kol and Elena to constantly be on the run and protect their unborn child.
One possible plot twist could be that the pregnancy is not what it seems at first. Maybe it's a magical or supernatural occurrence rather than a normal one. For example, it could be part of a spell gone wrong.
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.