One possible plot could be that they face many challenges in raising the baby. Maybe there are threats from the supernatural world that target their child. Damon, with his protective nature, would be on high alert all the time, while Elena uses her compassion to raise the baby in a loving environment.
Another group could be the vampire hunters. If they find out about the baby, they would likely see it as an abomination and try to kill it. They could be a constant threat, forcing Damon and Elena to keep moving and hiding. They might also team up with other supernatural enemies of Damon and Elena to try and take down the baby.
Another plot could be centered around the baby's upbringing in a world full of supernatural beings. Damon and Elena might struggle with how to raise the baby in a way that it can fit into both the human and supernatural worlds. They could face challenges like finding the right school or dealing with other vampires who might not be so accepting of a half - vampire baby. Maybe they would have to move to a new place to keep the baby safe.
Damon and Elena's relationship could become more centered around their family. In the past, their relationship was often about their own love and the supernatural drama around them. With a baby girl, they would focus on creating a stable home environment. They might have to sacrifice some of their own desires for the sake of their daughter. For example, Damon might have to give up some of his more dangerous vampire - related activities to be a better father figure. And Elena would have to balance her human life with being a mother to a half - vampire baby girl. This new focus on family would transform their relationship into a more mature and committed one.
Perhaps the baby girl gets kidnapped by an old enemy of Damon's. This enemy thinks that by taking the baby, they can get revenge on Damon. Elena then teams up with Damon's brother Stefan to rescue their daughter. Along the way, they discover secrets about Damon's past that he has been hiding from Elena, and this discovery could either strengthen or strain their relationship while they are desperate to get their baby girl back.
Stefan might be initially shocked but then be very supportive. He would probably offer to help in any way he can, like babysitting or giving advice based on his own experiences. Bonnie would be excited and use her magic to create some special things for the baby, like a protective charm.
In the fanfiction, perhaps the baby's birth is a very difficult and dangerous process. Since both Bella and Damon are from different fictional universes with their own set of rules regarding vampires and such. The baby could be a symbol of a new beginning for their relationship, forcing them to put aside their differences and work together to protect their child. They may have to face challenges from both the vampire and human communities who are either afraid of or envious of the baby.
Yes, in many fanfictions, Damon and Elena do get back together. Fanfiction writers often explore their relationship further and give them a second chance at love, as many fans were disappointed when they didn't end up together in the original series.
The popularity of Damon and Elena fanfiction stems from the fact that their relationship in the original series was so complex and full of drama. Fans want to expand on it, whether it's to give them a happier ending or explore the darker sides of their connection. They were two very interesting characters with a strong chemistry, and fanfiction allows fans to play with that dynamic.
Stefan could be really interesting. Since he has a long history with both Elena and Damon, his reactions to their marriage would be complex. He might be a bit jealous at first but then come to fully support them, adding an emotional depth to the story.