One idea could be that they face challenges from the supernatural community because of their union. Maybe other vampires are jealous or see it as a threat to the vampire hierarchy.
Another plot could be that they decide to start a family in a very unorthodox way for vampires. They might explore different magical means to have a child, which could lead to all sorts of adventures and conflicts. For example, they could seek the help of a powerful witch who has her own agenda.
The baby could also be a way to explore the more human side of Damon. He has always been a bit of a bad boy, but with a baby, he might become more nurturing. Caroline, on the other hand, could be the strict but loving mother. Their different parenting styles could lead to some humorous and heartwarming moments in the fanfiction.
One idea could be them navigating the supernatural politics together as a married couple. Klaus' power and Caroline's determination would make for an interesting dynamic in dealing with other supernatural beings.
Perhaps in the fanfiction, Caroline is pregnant in a world where there are magical or supernatural elements. She could be pregnant with a special child that has unique powers, and she has to protect it from those who might want to use its power for evil.
One possible plot could be that they initially struggle with the news. Damon might be in shock as he never expected to be a father. Caroline, on the other hand, is determined to face it head - on. They could face opposition from their friends or family who think they are not ready. But as time passes, they start to bond over the idea of having a baby. Damon becomes protective of Caroline and the unborn child, and they begin to plan for their future together as a family.
One possible plot could be that they initially struggle with the news. Damon might be hesitant at first, fearing his past and how it could affect the baby. Caroline, on the other hand, is determined to make it work. They then start to plan for the future, with Caroline insisting on a proper home and Damon slowly coming around to the idea of being a father. As the pregnancy progresses, they face challenges from the vampire community who are not sure about a half - vampire baby. But they stand together and fight for their family.
Another plot could involve Caroline's werewolf friend Tyler coming back and being initially skeptical but then becoming a strong support for them during the pregnancy. This could add some drama as there are historical tensions between vampires and werewolves.
One idea could be that Klaus and Caroline are in a relationship, but Camille's presence causes some jealousy and tension. For example, Camille might still have some unresolved feelings for Klaus, and Caroline has to deal with that while also trying to strengthen her bond with Klaus.
One idea could be Caroline exploring her newfound vampire powers in ways that are unique to her character. For example, she might use her charm and social skills to manipulate other vampires in the original vampire world.
A plot could revolve around Damon trying to make amends for his past vampire deeds as a human. He could start by helping the victims of his previous vampire attacks or their families. Also, his love life would change. If he was in a relationship with a vampire or a human before, now as a human, new dynamics would emerge. He might worry about being too weak to protect his loved ones.
One idea could be that Damon and Bella meet in a casino in Vegas. Damon, with his charm, tries to win Bella over in a game of poker. Another could be they both get involved in a mystery related to an old Vegas hotel, and they have to work together to solve it.