One common plotline could be the exploration of Belle's emotional turmoil. For example, she might initially be in disbelief when she discovers the Beast's unfaithfulness. She could then go through a period of self - reflection, wondering if she was lacking in some way. Another plotline could involve the Beast realizing his mistake too late, after he has already lost Belle's trust completely. He might then try to make amends in elaborate ways, but Belle is hesitant to forgive him.
The original Beauty and the Beast story is about building a relationship based on mutual understanding and respect. In the fanfiction where the Beast cheats on Belle, it shatters that foundation. It introduces a much darker and more complex aspect to their relationship that was not present in the original. There's no such betrayal in the classic story, and it makes the fanfiction a very different take on the characters.
Love is a very common theme. It's about how Belle and the Beast fall in love and how their love overcomes the curse. Another theme is transformation. Not just the Beast's physical transformation but also the emotional and mental transformation of both characters. Redemption is also there, as the Beast tries to atone for his past mistakes.
One common plotline could be in a romantic relationship context. Maybe Draco cheats on Harry with another Slytherin student, like Pansy Parkinson. This could lead to a big fight between Harry and Draco, with Harry feeling betrayed and angry. Harry might then go through a period of self - discovery, realizing he doesn't need someone who would be unfaithful.
Another theme is the exploration of their new life together. Fanfictions might show how they rule the kingdom, deal with the challenges of their different backgrounds (human and once - cursed), and grow as a couple. For example, some might focus on how Belle introduces new ideas to the Beast's court, and how they work together to modernize the kingdom.
Another theme is the idea of magic inheritance. Fans often write about whether the baby will inherit Beast's strength or Belle's intelligence, or perhaps some new form of magic altogether. It's a way to expand on the magical elements already present in the original story.
Often, there could be a plotline where Gray is forced into a situation that makes it look like he's cheating. Say, an enemy of Fairy Tail frames him by creating false scenarios. Or it could be a situation where Gray is trying to protect Lucy from a greater danger by getting closer to someone else, but Lucy doesn't understand his intentions at first. There are also plotlines where Gray's past comes back to haunt him and his interactions with an old acquaintance seem like cheating to Lucy.
Well, exploration of identity is a big theme. The female characters in Belle Beauty and the Beast femslash fanfiction may question who they are and what they want in a relationship. Also, the theme of acceptance is common. Just as Belle accepts the Beast in the original story, in femslash versions, characters might have to accept new and different forms of love. And of course, there's the theme of subverting the original narrative to create something new and exciting for the readers.
One common theme is the relationship between Belle and Beast in the context of the Descendants world. For example, how they deal with the new challenges and different cultures in that world.
It could be that Tony is under some sort of mind - control or influence that makes him cheat on Pepper. Then the story might focus on Pepper's journey to break the control over Tony and save their relationship.
There's a fanfiction called 'Beyond the Curse'. In this story, the author delves deeper into what happens after the curse is broken. It has a really interesting plot where Belle and the Beast face new challenges together, which is a fresh take on the classic tale.