The fanfiction could also be about the challenges Chloe faces during her pregnancy. For example, she might have health problems during the pregnancy. She could also face social issues, like dealing with people who judge her for being pregnant at a certain age or in a certain situation. The story could show how she overcomes these difficulties and grows as a person.
It could be that Derek and Chloe are in a relationship that was not really planned to be long - term. But the pregnancy changes everything. They start to re - evaluate their relationship and realize they have deeper feelings for each other. Along the way, they make new friends who support them through the pregnancy journey, and they learn a lot about themselves and each other.
Maybe the pregnancy is unexpected, and they initially panic. But then they start to get excited about building a family together. Chloe could start to train Lucifer on how to be a good father, like teaching him about baby care and normal family values, which would be a big change for him since he's from Hell.
One idea could be that they face challenges in their relationship due to the unexpected pregnancy. For example, Oliver might worry about how his vigilante life could affect the baby and Chloe. Another could be that they go on a journey to find a safe place for their family, away from the threats in Smallville. They could also have to deal with the reactions of their friends and family, some of whom might not be as supportive as they hoped.
One possibility could be exploring how Chloe King deals with the challenges of pregnancy while still maintaining her normal life and any special abilities she has. Maybe she has to hide her pregnancy from some enemies who might see it as a weakness.
One idea could be that they struggle to balance their work with the upcoming baby. For example, Lucifer's devil - related duties and Chloe's police work. Another could be that they have different ideas about how to raise the child, given their very different backgrounds. Maybe Lucifer wants to raise the child with a more 'devil - may - care' attitude while Chloe is all about discipline and rules.
One idea could be that they face challenges in their relationship due to the pregnancy. Maybe Lucifer is worried about his devilish nature affecting the baby, while Chloe is trying to balance her detective work with the new situation. Another plot could involve them having to protect the unborn child from supernatural threats, as Lucifer's world is full of such things.
One plot twist could be that Chloe discovers she's having twins instead of one baby, which doubles the excitement and also the stress for Alek and Chloe.
One common plot idea is how they deal with the challenges of having a baby while Lucifer is still adjusting to his life on Earth. For example, he might be worried about his devilish nature affecting the baby in some way.
One possible plot could be that they face challenges from their families. Maybe Oliver's family has certain expectations for him and the baby, and Chloe's family is worried about her future. Another aspect could be how they balance their superhero/vigilante activities with preparing for the baby.
One plot idea could be that Natsu has to deal with the physical and emotional changes of pregnancy while still trying to be part of his usual adventures. Maybe his friends are super protective of him now.