Another plot twist might be that the Beast is not actually a 'beast' in the traditional sense. In the fanfiction, he could be a wizard under a false appearance curse, and Hermione discovers this. It changes the whole dynamic of their relationship because now they are both magic - users, and she has to figure out how to break the false - appearance curse rather than the typical Beauty and the Beast curse.
A great plot twist could be that the 'beast' is actually a dark wizard in disguise. He pretends to be cursed to lure in the 'beauty' who is a powerful young witch. But as the story progresses, she discovers his true identity and has to use her magic to defeat him instead of breaking a curse with love.
In some Beauty and the Beast pregnant fanfictions, a plot twist could be that the source of the Beast's curse is actually related to a prophecy about his future offspring. So, when Belle becomes pregnant, it sets off a chain of events that were foretold long ago. This could involve other magical beings coming to the castle to either protect or harm the baby. Another plot twist might be that Belle's pregnancy gives her the ability to communicate with the forest animals in a more profound way than before. They then become her allies in protecting the baby from any threats that may come from the dark corners of the enchanted forest.
Maybe Hermione accidentally casts a spell that combines the story of Beauty and the Beast with their world. Harry becomes the 'beast' and Hermione starts to live in the same 'enchanted' area of Hogwarts as him. They gradually develop a deeper understanding of each other. As they explore the magic that binds them in this new situation, they also discover secrets about Hogwarts that were previously unknown.
Often, a plot twist might involve Hermione uncovering a secret that Lucius has been hiding. This could be related to some dark magic he's involved in or a family secret. This discovery could then give Hermione some leverage over Lucius. Or perhaps there's a twist where other characters from the Harry Potter universe get involved. Like Harry and Ron coming to rescue Hermione, but she refuses to leave because she's in the middle of a complex plan to bring down Lucius from the inside.
A common plot twist is that Hermione actually has a hidden power or ability that she reveals during her captivity. For example, she might be able to use a type of magic that Draco and his associates didn't expect, which gives her an upper hand in the situation. This could lead to a change in their relationship dynamic, from captor - captive to something more like equals.
One common plot twist could be that the blackmailer is someone she least suspects, like a fellow Hogwarts student who has a hidden agenda. For example, they might be jealous of her academic achievements and use some secret they've uncovered to try and undermine her. Another could be that the blackmail involves a dangerous magical secret she's been entrusted with, and if it gets out, it could put the wizarding world in jeopardy.
One common plot twist is that Hermione discovers she's the Chosen One later than expected. For example, she might think she's just an ordinary, albeit brilliant, witch until some event reveals her true destiny. Another twist could be that the prophecy about the Chosen One was misinterpreted all along, and it was actually Hermione, not someone else. This can lead to a lot of drama and re - evaluation of the wizarding world's beliefs.
One interesting plot twist could be that the Beast is actually a cursed prince from a rival kingdom, and the curse was placed by an evil sorcerer who wanted to start a war between their kingdoms. Another could be that Beauty has a hidden power that she discovers while in the castle, and this power is the key to breaking the curse in a completely unexpected way. Maybe she can communicate with the enchanted objects in a way that no one else can, and they reveal a secret about the curse.
In Hermione - centered Beauty and the Beast fanfiction, she may also have different relationships with the other characters. The Beast might be more intimidated by her at first because of her magical abilities. And the enchanted objects in the castle could be in awe of her intelligence. For instance, she could use her knowledge of potions to try and find a cure for the Beast's curse, while also forming unique bonds with the talking teapot or candlestick.
Well, Harry in the role of the Beast would be more territorial about Hogwarts, which he now sees as his own 'castle'. He would be hesitant to let Hermione in at first, but slowly open up as he realizes she's different. His scar could be part of his 'beastly' appearance, adding to his sense of being different. Hermione would fit the Beauty role by being the one who brings light into Harry's dark world. She would be patient with him, using her logical mind to try and understand his situation, and at the same time, she would be drawn to his inner strength that she can sense beneath his exterior.