Perhaps in the fanfiction, Percy is tricked into believing that Reyna is a threat to Camp Half - Blood. So, he kidnaps her to keep her away. But as he takes her to an isolated place, he starts to realize that he has been misled. Then, they have to work together to find out who tricked him and why. Along the way, they face various challenges like attacks from mythical creatures that are also being manipulated by the real enemy behind the scheme.
The plot could start with Percy having a strange dream that convinces him Reyna is in danger of causing chaos. He kidnaps her to protect the world from this 'danger'. However, once he has her, he discovers that there are deeper forces at work. Reyna, instead of being angry at first, tries to understand Percy's motives. They then embark on a journey to uncover the truth, which leads them to a long - forgotten prophecy that somehow links both of them and the future of the demigod world.
One possible plot could be that Percy is being controlled by some dark force. Maybe a new evil god or an ancient curse. This force makes him kidnap Reyna because she has some important knowledge or power that the dark side wants. For example, she might know the location of a powerful weapon that could tip the balance in a coming war between the gods and the titans' remnants. Percy, against his will, takes Reyna to a secret location. Reyna, being a strong and resourceful character, tries to figure out a way to break Percy out of the control while also dealing with the situation at hand.
It could be an old enemy of the gods who has been biding their time. Maybe a powerful Titan that was thought to be defeated but has found a way to come back. This Titan could use Percy to kidnap Reyna because she has a connection to a certain power that the Titan wants to use to regain full strength and overthrow the gods once again.
Well, one possible plot could be that Luke kidnaps Percy to use him as a bargaining chip. Maybe he wants to trade Percy to the Titans for more power or a higher position. Luke might keep Percy in a secret location, like an old, abandoned temple. Percy, of course, would try to escape and find a way to warn his friends at Camp Half - Blood.
In fanfiction, the idea of Percy Jackson and Reyna being siblings is a concept that some writers like to play with. It can add an interesting twist to the story. Maybe they create a backstory where they are siblings separated at birth or something similar. But remember, this is just in the realm of fan - created stories and not part of the original mythology or the main series. Fanfiction gives fans the chance to explore relationships in new and unexpected ways.
Maybe in the fanfiction, Percy and Reyna meet during a time of peace. They initially bond over their shared love for their respective camps. They decide to exchange knowledge, Percy teaching Reyna some of the more unorthodox combat techniques he learned from Poseidon, and Reyna teaching Percy about Roman military strategies. As they spend more time together, they also help each other deal with personal issues. Percy helps Reyna open up more about her feelings towards her sister, and Reyna helps Percy better understand his role as a hero in a changing world. Their friendship grows as they support and understand each other more deeply.
Well, immediately after the kidnapping, there would likely be chaos. The Romans would be up in arms, demanding Reyna's return. Meanwhile, Percy's friends at Camp Half - Blood might be shocked and confused. Some might support Percy if they think he has a good reason, while others would be against his actions.
One idea could be that Percy and Reyna team up to go on a quest to find a lost magical artifact that has the power to restore a dying realm. They face various mythical creatures along the way and start to understand each other's strengths and weaknesses better.
One possible plot could be that after years of adventures and growing closer as friends, Percy and Reyna start to realize they have deeper feelings for each other. They might face some initial resistance from their friends who are used to them just being comrades. But as they work together on a new mission, their bond strengthens and they finally decide to get married. The wedding could be a grand affair with all their demigod friends in attendance, celebrating their union.
One idea could be that Percy is under a spell or some kind of mind control when he kidnaps Reyna. Maybe a new villain has emerged and is using Percy as a tool. In the fanfiction, Percy might be fighting against this internal force while Reyna is trying to figure out how to break the spell on him.
One idea could be Percy and Reyna teaming up for a special quest that takes them to a mysterious and dangerous new realm. They have to rely on each other's skills, Percy's water powers and Reyna's leadership and combat abilities, to survive and complete their mission.
Jason is another good choice. He has a history with both Percy and Reyna. His leadership skills and his connection to the Roman side of the demigod world could bring in new plotlines. For example, he could help Percy and Reyna understand some of the more complex Roman demigod politics that they need to navigate.