Yes, there might be such a fanfic. Fanfiction often explores unique and creative concepts, and the idea of a character like Belatrice Decker being Lucifer's daughter is an interesting one that could attract fanfic writers. They might use this concept to create all kinds of stories, perhaps exploring her powers, her relationship with Lucifer, or her role in a fictional universe.
It could be a story of self - discovery. Belatrice might start to notice strange powers or abilities within herself and gradually realize her connection to Lucifer. She could then struggle with whether to embrace this part of her or try to reject it and be 'good'.
In many fanfics, when Chloe finds out Lucifer is the devil, it completely shakes up their relationship. It often leads to a period of mistrust as Chloe has to re - evaluate everything she thought she knew about Lucifer. It can also drive the plot in new directions, like Chloe trying to figure out Lucifer's true motives all along.
Chloe Decker's dad doesn't die in the comics. The storylines don't include that event. Maybe there's some confusion with a different version or interpretation, but in the original comics, he remains alive throughout.
Some characters might be shocked and start to distance themselves from Lucifer. They may fear for their safety or be worried about the implications of having a devil around. Others might be more curious and want to learn more about Lucifer's true nature from Chloe.
I don't have enough information to know exactly who Bobby Decker is in this story. He could be a child, a young man, or even an older person. Maybe he's a local character in a community where this Christmas story originated.
For Merlin, there are both good and bad consequences. On the bad side, some of the more traditional and anti - magic people in Camelot might try to oppose him. However, since Arthur now knows, he has a powerful ally. Arthur can protect Merlin from those who would do him harm. Also, Merlin can now be more open about using his magic for the good of Camelot, which is a positive change.
I'm not sure specifically as there could be many stories related to Bobby Decker at Christmas. It might be about Bobby Decker's experiences during Christmas, like his family traditions, the presents he got or gave, or some special events that happened to him during the Christmas season.