Yes, there are likely some fanfics out there with such a plot. Fanfic writers often come up with creative and unexpected storylines. You can try searching on popular fanfic websites like Archive of Our Own or Fanfiction.net. They have a large collection of Vampire Diaries fanfics and you might be able to find one where Bonnie is pregnant in a story involving Damon.
One great fanfiction is 'Bonnie's Power Surge Against Katherine'. In this story, Bonnie discovers a new level of her magic that she uses to outwit Katherine. It's really exciting as it shows Bonnie in a more powerful light than in the show sometimes. The author does a great job of creating tension between the two characters.
One great fanfiction is 'Kol and Bonnie: An Unlikely Bond'. It delves into how their characters, who seem so different at first, start to understand and rely on each other. The author does a wonderful job of creating a believable relationship between them, set against the backdrop of the Vampire Diaries world.
One great Bonnie and Kai fanfiction is 'The Unlikely Bond'. It delves into how Kai's chaotic nature and Bonnie's powerful magic create an interesting dynamic. Their interactions are filled with tension and an underlying attraction that the author builds up really well.
One great fanfiction is 'Bonnie and Damon: The Unlikely Bond'. It delves deep into their relationship, exploring how Bonnie's magic and Damon's vampiric nature interact. Another is 'A New Beginning for Bonnie and Damon' which takes place in an alternate universe where they meet under different circumstances and form a strong connection. There's also 'Bonnie, Damon and the Cursed Amulet' which has an exciting plot full of mystery and their growing relationship.
I think 'Bonnie and Damon: Time - Twisted Love' is a great one. It involves time - traveling which adds a really cool twist to their relationship. Another is 'Bonnie and Damon: Body Swap' where they end up swapping bodies and have to deal with each other's lives. It's hilarious and also shows a different side of their connection. And 'The Inverted World of Bonnie and Damon' where the rules of the vampire and magic world are inverted for them.
They have a lot of chemistry. Damon is a complex character with his bad - boy charm, and Bonnie is strong - willed. Their interactions in the show are often intense, which makes fans want to explore their relationship more in fanfiction.
The chemistry between Jeremy and Bonnie is another reason. They have a lot of on - screen moments that show a certain level of closeness and understanding. Fanfiction writers can build on this chemistry. They can write about the unspoken feelings that might exist between them, like the way Jeremy looks at Bonnie when she's using her magic, or how Bonnie always seems to worry more about Jeremy when he's in danger. These little details can be expanded in fanfiction to create a great love story.
One common theme is the idea of an unlikely friendship. Since they have different personalities in the show, fanfictions often explore how they can form a deep bond. Another theme is adventure. They are usually thrown into some sort of dangerous or mysterious situation together.