The plot might involve Kol falling in love with Elena. Kol, being the wildcard among the Originals, could try to win Elena over in his own unique way, which might create a lot of drama with the other characters like Damon and Stefan who are also interested in Elena.
Perhaps it's a story where Elena tries to understand Kol better. She realizes that there is more to him than his reputation. So she delves into his past, his family history among the Originals, and in the process, they develop a deep connection that changes both of them.
One possible plot could be that Kol kidnaps Elena to use her as bait for his enemies. He might think that by having Elena in his custody, her friends, especially the Salvatores, would come to rescue her and he could then ambush them. Another idea is that Kol has some sort of vendetta against Elena because of her connection to the doppelganger bloodline. So he kidnaps her to extract revenge on the entire line.
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 could be that Kol, being the charming and somewhat dangerous vampire he is, initially catches Elena's eye in a moment of unexpected encounter. Maybe at a supernatural gathering. He starts to show her a different side of the vampire world, full of ancient secrets and forgotten powers. This new perspective intrigues Elena, and as they spend more time together, they develop feelings for each other despite the many obstacles like the existing relationships Elena has and the disapproval from other vampires and her friends.
One possible plot could be that Kol and Elena meet by chance in a place outside of Mystic Falls. They initially clash due to their different personalities and pasts. Kol is intrigued by Elena's tenacity and her kind heart despite all she has been through. As they are forced to spend more time together, perhaps because of a common threat, they start to understand each other better. Elena begins to see Kol not just as one of the bad guys but as someone with his own complex story. Their love could develop gradually as they share their secrets and fears, and finally, they realize they are in love.
Another character that could be important is Elijah. He is often the voice of reason among the Originals. He might try to guide Kol in his relationship with Elena, or he could be against it if he thinks it will bring trouble to their family. So in this fanfiction, he could be a key figure in the development of the Kol - Elena relationship.
Well, perhaps the plot could involve Damon and Elena having an instant connection. Maybe Damon saves Elena from some sort of danger in this fanfic, which starts their relationship on a very different foot compared to the original story. It could also be that they share a deep conversation right away, revealing parts of their personalities that they usually keep hidden.
One possible storyline could be that Kol and Elena's relationship starts in a rather unexpected way. Maybe they are forced to work together to defeat a common enemy in the supernatural world. During this time, they gradually develop feelings for each other. And when they find out Elena is pregnant, they face a lot of challenges. Some vampires might oppose their union because of Kol's past actions. But they decide to fight for their family and the future of their baby.
The other vampire clans might be antagonists. They could see the baby as a threat to the vampire hierarchy or fear that the baby will have powers that could disrupt the balance among vampires. For example, the Originals' siblings who don't trust Kol might try to stop Elena from having the baby.
A plot could involve Elena and Kol having to deal with an ancient prophecy related to their unborn child. They have to figure out what it means and how to prevent any negative consequences. Along the way, they learn more about each other's pasts and how their families' histories are intertwined with this prophecy, which makes them more determined to protect their family.
One idea could be that the baby has special powers due to Kol and Elena's unique heritages. For example, it might be able to control both vampire and witch magic in a new way. Another plot could involve the baby being a target by various supernatural forces who either want to use its power or destroy it out of fear. And perhaps the baby's existence could bring about a new era of peace or chaos in the supernatural world, depending on how it's raised and the choices it makes as it grows up.