A great plot idea could be that the castle and the surrounding forest start to change in strange ways. Belle and Prince Adam suspect it's related to the curse, but as they investigate, they find out it's due to an imbalance in the magic of the land. They then have to team up with the enchanted objects in the castle to restore the balance. Along the way, they learn more about each other and their love deepens. Belle might also discover some of her own latent magical abilities that help in this quest.
Well, a really interesting plot could be that Prince Adam's curse starts to affect Belle in some strange way, like she starts to have visions of his past. Then they have to figure out how to stop this new development. Also, they could go on a journey to find a long - lost relative of Adam's who might have a way to break the curse completely. And there could be a part where they face a magical being who tests their love for each other in unexpected ways.
A third idea is that there is a curse placed on the entire kingdom that makes everyone forget who they are, including Prince Adam and Princess Belle. They have to work together to figure out their identities and break the curse. Along the way, they might have some funny moments where they mistake each other for someone else, but gradually they start to rediscover their love for each other through small, kind gestures and shared memories.
One idea could be Belle being the new student at Adam's high school. Adam is the popular but brooding student. Belle's intelligence and kindness start to break through Adam's tough exterior as they get paired for a school project. This could lead to a slow - burn romance filled with typical high school drama like jealous classmates and misunderstandings.
One possible plot could be that they face challenges in preparing for the baby. Maybe Belle is worried about how the Beast's past might affect their child. They could also have to deal with the reactions of the townspeople, some of whom might still be fearful of the Beast, now Prince Adam. And they would surely be excited to create a nursery in the castle and start thinking about how to raise the child with love and kindness.
One idea could be exploring Adam's adventures in an alternate universe. Maybe in this universe, he has to team up with a different version of himself to save the day. Another could be delving into his relationship with his mother before the events of the movie in a more in - depth way.
One popular type of 'Belle and Prince Adam fanfiction' might be those that explore their life after the 'happily ever after'. For example, stories could be about them ruling the kingdom together, facing new challenges like dealing with neighboring kingdoms' politics or natural disasters in their own land.
Maybe in the fanfiction, there's a threat to both their kingdoms. Mulan, with her combat skills, and Belle, with her intelligence, team up. They use their unique strengths to outwit the enemy. For example, Belle deciphers the enemy's coded messages while Mulan leads the defense. They also learn from each other's cultures along the way.
Maybe Belle gets lost in the jungle where Kaa lives. Kaa at first thinks she's an intruder but then realizes she's different. He helps her find her way back home by using his knowledge of the jungle paths. Along the way, they form an unlikely friendship and Belle teaches Kaa about the outside world.
One idea could be Adam's backstory exploration. Maybe he had a different life before coming to the Hazbin Hotel universe and that could be delved into. For example, his family, his upbringing, and how those things might have shaped his current self.
Maybe they could go on a road trip together. Along the way, they discover new things about each other and their pasts. They might run into old friends or foes from their respective storylines, which could add drama and conflict to the fanfiction. For example, they could encounter someone who has a grudge against Adam and Chelsea has to decide whether to stand by him or not.
One interesting plot idea could be that Lucifer, seeing Adam's pure and innocent nature, decides to test him in various ways. He might create illusions of worldly temptations to see if Adam can resist. Another could be that Adam, being curious about the fallen angel, tries to understand Lucifer's fall from grace and in the process, they form an unlikely friendship that challenges the norms of heaven and earth.