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.
Maybe in the fanfiction, Kol returns to Mystic Falls with a new outlook on life. He crosses paths with Elena, who is still dealing with the aftermath of her previous relationships. Kol starts to court Elena in his own unique way, which at first annoys her but then starts to charm her. Their love story could involve them going on adventures together, away from the drama of the Salvatore brothers and other vampires in Mystic Falls. Along the way, they discover that they have a deep connection that blossoms into love.
The plot could start with Kol being cursed or in some sort of trouble, and Elena is the only one who can help him. At first, Elena is hesitant to get involved with Kol, but she can't resist his charm and the mystery surrounding him. As she helps him break the curse, they get closer. They might have some steamy moments while also having deep conversations. Kol shows Elena a different side of the vampire world, and she shows him the value of human emotions. This mutual discovery leads to their falling in love.
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 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.
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.
The relationship would shock Damon and Stefan. They have always been protective of Elena, and Kol has a reputation as a dangerous vampire. Damon might be especially angry and try to drive Kol away from Elena. Bonnie would also be concerned as she has seen Kol's past actions. However, Caroline might be more open - minded and could potentially try to help Elena understand her feelings for Kol. Klaus would be an interesting factor too. He might see Kol's relationship with Elena as a way to gain an advantage in his power games or he could be protective of his brother's new - found love.
One plot idea could be that Kol returns after a long absence and tries to win Elena back from Damon or Stefan. He could use his unique vampire powers and knowledge to show Elena a different side of the vampire world. Another idea is that Kol and Elena get trapped in a magical realm together and have to rely on each other to escape, during which they discover their true feelings for each other. Or perhaps Kol is cursed and Elena is the only one who can break it, and through their journey to break the curse, love blossoms.
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.
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.
A great fanfiction could be 'Elena and Kol's Eternal Love'. This might show their relationship as something that endures through various trials and tribulations. It could start with their initial attraction, develop into a deep love, and then face obstacles like the disapproval of other characters or the forces of the supernatural world that they inhabit. Their love would be the central theme, with the story exploring how they overcome difficulties to be together.
The Salvatores, Damon and Stefan, are likely candidates. They have always been protective of Elena and would do anything to save her. They could use their vampire skills and knowledge of Kol's weaknesses to stage a rescue.
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.