If they are from 'The Originals', one key event was when Davina first encountered Kol's family. This put her in a dangerous position as a witch. Another was when Kol and Davina started to develop feelings for each other despite their different natures. And when Davina had to make a choice between her loyalty to the witches and her relationship with Kol.
I'm not sure specifically which 'Kol and Davina' you are referring to. There could be many characters with those names in different stories. If they are from a TV show like 'The Originals', Kol was a vampire and Davina was a powerful witch. Their relationship was complex. Davina was initially used in the power struggles among the vampires and witches, and her connection with Kol grew over time, filled with love, betrayal, and many challenges in the supernatural world of the show.
Kol Davina fanfiction often has intense emotional moments. Given their different backgrounds and the challenges they face, there are a lot of heart - wrenching and heart - warming scenes. The fanfictions also tend to expand on the lore of their world. They might introduce new types of magic or new vampire abilities related to Kol. And a lot of them play with the idea of fate, whether Kol and Davina are truly meant to be together or if they have to fight against the odds.
One common theme is the struggle against their different natures. Kol is a vampire with a dark past and Davina is a powerful witch. Their relationship often has to overcome the challenges posed by their respective supernatural identities.
One possible plot could be that Kol turns Davina into a vampire out of love. He doesn't want to lose her to mortality. Davina, at first, is horrified as she has always been on the side of the witches. But as she starts to experience her new vampire powers, she begins to see the world in a different light. She and Kol then have to face the wrath of the witch community who see her transformation as a betrayal.
Well, 'Kol's Redemption through Davina' is a great fanfiction. It shows how Kol, with Davina's help, tries to atone for his past wrongs. There's also 'Davina's Secret Love for Kol' which is more focused on Davina's internal struggle with her feelings for Kol. And then there's 'Kol and Davina in the Parallel World' where they face different situations in an alternate reality that really tests their relationship.
Their relationship would become more intense. As a vampire, Davina would have new emotions and instincts. Kol, who has more experience as a vampire, would have to guide her. This could lead to some power struggles as Davina is used to being in control. But it could also bring them closer as they face new challenges together.
One possible plot could be that Davina and Kol discover the pregnancy unexpectedly. They might face many challenges. For example, they would have to deal with the reactions of their families and friends in the supernatural world. Some might be happy, while others could be worried about the implications of a half - witch, half - vampire baby. Also, they would need to protect the unborn child from the many threats in their world.
For Davina, she would become more cautious. As a mother - to - be, she would no longer take risks as easily. Her focus would shift from just her own powers and place in the supernatural world to protecting her unborn child. Kol, being the father, would likely become more responsible. He has a bit of a wild streak, but the pregnancy would make him think twice before getting into dangerous situations.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions on various topics, including Kol and Davina as soulmates. Just use the search function and type in 'Kol and Davina soulmates' and you'll likely find many interesting stories.
One key event is the murders committed by William Afton in Freddy Fazbear's Pizza, which led to the animatronics being haunted. Another is the constant struggle of the night guards to survive the nights against the possessed animatronics.