The fanfiction could start with Percy and Reyna being forced to work together in a diplomatic mission between the Greek and Roman camps. At first, there are misunderstandings and cultural clashes. For example, Percy's laid - back attitude clashes with Reyna's strict Roman discipline. However, during a crisis in the middle of the mission, like an attack from an outside force, they realize they need to put aside their differences. They combine their powers and skills, Percy's control over water and Reyna's ability with weapons and leadership. Through this experience, they develop a deep respect for each other and become friends who are determined to bridge the gap between the two camps.
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.
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.
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.
In a fanfiction, their friendship could start with a simple act of kindness. Percy could save Reyna from a minor accident. Reyna, being grateful, starts to see Percy in a different light. They begin to have small conversations, getting to know each other's likes and dislikes. Over time, they realize they have more in common than they thought. They support each other in their personal goals, like Percy helping Reyna with a project for the Roman camp and Reyna helping Percy with his relationships at Camp Half - Blood. This mutual support cements their friendship.
Well, perhaps the story could revolve around how Percy and Reyna adjust to their new roles as parents. They could struggle with balancing their duties in the demigod world and taking care of their little one. Maybe they have to seek help from their friends in Camp Half - Blood and Camp Jupiter to keep the baby safe and happy.
One possible plot could be that after a great battle, Percy and Reyna find themselves drawn to each other more than ever. They start to work together on rebuilding their world, and during this process, their friendship blossoms into love and they decide to get married.
One possible plot could be that Percy and Reyna are betrayed by their closest allies within the demigod community. Maybe they are framed for a crime they didn't commit, like stealing a powerful artifact from the gods. Their friends turn against them, believing the false accusations. Percy and Reyna then have to go on the run, trying to clear their names while also facing various threats from the gods who are angry about the supposed theft.
One possible plot twist could be that an old enemy from their past resurfaces to try and stop the wedding. Maybe a monster that they thought was defeated long ago shows up and creates chaos. Another twist could be that there are some misunderstandings between Percy and Reyna just before the wedding. For example, a false rumor spreads about Percy's loyalty, which makes Reyna question their relationship. Also, a prophecy might be revealed that says their union will have unexpected consequences for the demigod world, forcing them to decide whether to go through with the marriage or not.
One reason could be that Percy is still deeply in love with Annabeth. His loyalty to her is unwavering, so he might reject Reyna out of his commitment to his existing relationship. For example, in the original series, Percy's relationship with Annabeth is built on years of shared adventures and mutual understanding.
One reason could be that Percy has shown great courage and strength, which Reyna respects. She might see in him the potential to be a great ally or even a leader. So, she becomes protective to ensure his safety and to keep him on their side.
The plot could involve Reyna trying to hide her feelings from Percy while they are on some sort of adventure together. Maybe she has to work with him to defeat a new threat in the Percy Jackson world, all the while struggling with her internal emotions.