Love and acceptance is also a prevalent theme. Since Beckett comes into Castle's life and becomes part of Alexis's world, fanfics may focus on how they all learn to love and accept each other fully. This could involve storylines where there are initial misunderstandings but eventually they come to a place of complete acceptance and harmony in their relationships.
A common theme is friendship. Many fanfics explore how Beckett and Alexis become friends and the bond they share. Another theme is growth, as they both develop as characters within the fan - created stories.
Common themes in fanfic usually revolve around relationships. For Alexis Hurts Beckett fanfic, it could be a complex relationship filled with misunderstandings that they have to overcome. There might also be themes related to power dynamics if one character has more power or influence than the other. Another possible theme could be self - discovery, as they interact with each other and learn more about themselves in the process.
There are definitely some great 'castle beckett and alexis fanfic' pieces. If you like stories that explore the emotional side, you might find some where Alexis has to deal with the dangerous aspects of her father's and Beckett's job. Others could be more light - hearted, showing their day - to - day interactions in a humorous way.
She could be defensive of Beckett. Since Alexis probably has a good relationship with Beckett, she may try to convince Castle that he's wrong and that Beckett didn't mean any harm. For example, she might tell Castle about all the positive things Beckett has done for her.
Fanfiction.net is a great place to start. It has a large collection of fan - created stories, including ones related to Castle, Beckett, and Alexis.
It could be that Castle is overprotective. He loves Alexis so much that even the slightest sign of Beckett not being on the same page as Alexis in Castle's eyes makes him think Beckett hurt her. Maybe Beckett gave Alexis some career advice that Castle thought was too pushy.
One common theme is family. Since Alexis is part of the Castle family, many fanfictions explore her relationships with her father, mother, and brother. Another theme is her academic and career pursuits. As she is an intelligent character, fanfictions often show her in different professional settings.
You could also check out FanFiction.net. There are fanfics that might take a more adventurous take on the Castle - Beckett - Alexis dynamic. For example, they could be involved in a mystery together where Alexis plays a more crucial role than in the original show, adding new layers to their relationships.
One common theme could be the deepening of their relationship. Given the 'rated M' aspect, it might explore the more passionate and physical side of their connection.
One common theme is sacrifice. Either Castle or Beckett may sacrifice their relationship for the greater good, like protecting the other from a dangerous situation. Another theme is the power of love. Despite being forced apart, their love still endures and is often the driving force that eventually brings them back together.