They would become more protective. Stefan, who has always been somewhat of a protector, would be even more so. Bonnie would also be very protective but in a different way, using her magic to safeguard the baby. Their relationship would deepen as they are united in their love for their child.
One idea could be that the baby has some sort of special power. Maybe it can communicate with the spirits like Bonnie, and this causes both joy and concern for Bonnie and Stefan. They have to protect the baby from those who might want to use its power for evil.
One great Bonnie and Stefan fanfiction is 'A Different Kind of Bond'. It explores their relationship in a unique way, delving into how they might support each other through the various challenges in the vampire - witch world. Another is 'Bonnie and Stefan: The Unlikely Alliance' which shows them teaming up against common enemies and in the process, growing closer. There's also 'Stefan and Bonnie's Hidden Journey' that takes readers on a journey of discovery as they find new aspects of their connection.
One common theme is friendship. Stefan and Bonnie often start as friends in the fanfictions. For example, they might be friends first and then face challenges that make their bond stronger.
I'm not sure who the absolute best is, but some popular ones might be those who have a deep understanding of the characters. Writers who can capture Stefan's brooding nature and Bonnie's strong - willed spirit well are likely to create great fanfictions. You can look for authors who have a lot of positive reviews from other fans.
One possible fanfiction could start with Bonnie discovering she's pregnant. She's in shock as she and Stefan hadn't planned for this. Stefan, at first, is also stunned but quickly steps up. He vows to be there for Bonnie every step of the way. They face the judgment of their friends and family, some who think it's too soon or that they're not ready. But they grow closer as they prepare for the baby, sharing hopes and fears. They decorate a nursery together, choosing soft colors and cute little toys. In the end, they welcome their baby into the world with open arms and lots of love.
Well, a big theme is 'unlikely friendship turned love'. They start as acquaintances or even enemies in some cases, and then their relationship evolves into love. 'Discovering new powers together' is also a theme. As Bonnie has her witch powers and Stefan his vampire abilities, sometimes in fanfictions they discover new ways to combine or enhance their powers when they are together. And 'protecting each other' is a theme that shows their loyalty and deepening bond.
One interesting plot could be them dealing with the reactions of their friends. Maybe Damon is initially shocked but then comes around. Another could be Stefan and Bonnie exploring new magical abilities together that come from their union.
Well, for one thing, fans are always interested in seeing different pairings. Bonnie and Stefan each have their own unique personalities and storylines in the original show. When combined in fanfiction, especially with a kiss involved, it creates a whole new set of emotions and plot possibilities. Their different powers and backgrounds can lead to really interesting interactions that draw readers in. Also, it gives fans a chance to rewrite or expand on the story in a way that satisfies their own desires for the characters' relationships.
One challenge could be the reaction of their friends. Some might be supportive, but others could be judgmental or think they're not ready. Another challenge is dealing with the physical and emotional changes during pregnancy. Bonnie would have to deal with morning sickness, mood swings, etc. and Stefan would need to be understanding. Also, they might face financial difficulties in preparing for the baby.