Well, the plot could center around Mercy's adventure in a new land. Maybe she discovers a hidden realm that was lost long ago. Since she's the daughter of Ben and Mal, she has the courage and magic to explore it. She could face various challenges there, like befriending strange creatures and overcoming dark magic. Also, the story might show how Mercy uses her unique skills, which are a combination of her parents' traits, to save this new land from destruction. This would make for an exciting fanfiction story.
One possible plot idea could be Mercy's struggle to find her own identity in the shadow of her famous parents. She might feel pressured to live up to their legacy. Another idea could be Mercy getting involved in a magical mystery that only she can solve, perhaps something that endangers the magical world her parents helped create. Or it could be a story about Mercy's first love and how she navigates the complex emotions while also dealing with the expectations of being the daughter of Ben and Mal.
Mercy's character development could start with her being a bit naive about the world outside of her family's influence. As the story progresses, she might experience betrayal from someone she thought was a friend. This would make her more cautious and less trusting. Then, she could have a mentor, perhaps an old wizard, who teaches her about the deeper aspects of magic. Through this, she grows in wisdom and power, and also becomes more empathetic towards others who are going through tough times. She would gradually transform from a sheltered girl to a strong - willed young woman.
Perhaps Fairy Godmother. Since she has a lot of magic and knowledge, she could be a great help. She might be able to find a way to send the daughter back to her own time or at least give her some advice on how to survive in the past.
A common theme is the struggle with identity. Since she is the product of two very different backgrounds, she often has to figure out who she is. For example, she might question if she should be more like her mother, the former villain, or her father, the king of Auradon.
Well, it could be that Ben decides to propose during a big event. For example, during a royal ball where all their friends and family are present. He gets on one knee in front of everyone, and Mal is completely surprised. Maybe there are some misunderstandings before the proposal, like Mal thinking Ben is too busy with his royal duties to think about their relationship at that level, but then he proves her wrong.
One interesting fanfiction could be about their daughter inheriting Mal's magic and having to learn how to control it in a world that is more accepting of magic than when Mal first arrived. She might struggle with the pressure of being the princess and having such powerful abilities.
One idea could be exploring how Ben and Mal's family deals with a new magical threat to Auradon. Maybe an old enemy resurfaces and they have to combine their unique skills and powers to protect their kingdom.
One idea could be Ben trying to introduce more modern ideas to the Isle of the Lost while Mal is hesitant as she fears it might disrupt the fragile peace. For example, he wants to start a school exchange program but Mal is worried about old grudges resurfacing.
One idea could be that Mal struggles with her new role as Ben's girlfriend and future queen. She might feel pressured by the expectations of Auradon society. Another could be a story where an old enemy from the Isle of the Lost tries to break them apart by causing misunderstandings between Mal and Ben.
Another plot could involve Ben being overprotective. He could be constantly worried about Mal and the baby's safety. This might lead to some comical situations where he tries to prevent Mal from doing normal things she used to do, like going on small adventures or using her magic in a carefree way. Also, it could show their relationship growing stronger as they face this new chapter together.
One idea could be that they are in a secret garden and it's a moment of stolen passion. Maybe they are hiding from their duties as royalty for a brief time and the make - out session is a way to express their love away from prying eyes.