One possible plot twist could be that Percy is initially oblivious to Jason's feelings. Then, just when Jason is about to give up, Percy discovers his own hidden feelings for Jason. Another twist could be that there's some external force, like a god or a prophecy, that tries to keep them apart. Or perhaps Jason discovers that Percy has a pre - existing relationship that he didn't know about, which complicates his crush.
In the fanfic, the relationship might develop slowly. Jason could start by doing small things for Percy, like getting him his favorite food or helping him with his training. Percy would start to feel a connection, but be confused about his own feelings. As they face challenges side by side, like fighting monsters or dealing with other demigods' jealousy, their relationship would deepen. Eventually, they might have a heart - to - heart conversation where they confess their feelings for each other. Along the way, they would also have to deal with the reactions of their friends, some of whom might be supportive while others might be against it.
In a 'Jason has a crush on Percy' fanfiction, the relationship might develop in a rather complex way. Jason's crush could make him act a bit strange around Percy at first. Percy might notice this and start to wonder what's going on. Meanwhile, there could be other characters who suspect Jason's feelings. This external pressure could either push Jason to confess sooner or make him more hesitant. If Percy has some feelings in return, they might start with small gestures like a lingering touch or a special look. But if Percy doesn't, he might try to gently let Jason down while still maintaining their friendship. As the story unfolds, new events and challenges could further shape how their relationship evolves, whether it becomes a romantic one or remains a strong friendship.
One possible plot could be that Jason is really shy about his crush at first. He tries to be around Percy more often, like joining the same quests or training sessions. He might secretly do nice things for Percy, like leaving his favorite food at his cabin without saying who it's from.
Perhaps they argue over a girl. They are both heroes and might have feelings for the same person. Jealousy and competition could spark an argument between them. Also, their loyalty to different camps, Camp Half - Blood and Camp Jupiter, could be a source of conflict. They might have different ideas on how to handle the relationship between the two camps, which would lead to arguments.
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.
You can try looking on popular fanfic platforms like Archive of Our Own (AO3) or FanFiction.net. Just search for the relevant tags like 'Reyna', 'Percy', and 'crush' to narrow down the results.
There's also a fanfiction called 'Percy's Forbidden Love'. This one is a bit more angsty as Percy realizes that his crush on Artemis can never be fulfilled due to her divine nature and her vow of chastity. It explores his pain and acceptance of the situation.
At first, it might show the tension between them due to Jason's jealousy. Jason could be distant or snippy with Percy. But as the story progresses, they might start to communicate. Maybe Percy notices Jason's jealousy and tries to reach out, which begins to thaw the ice between them.
In fanfics, the writer has a lot of creative freedom. Percy's crush could be a completely new character created by the author just for this story. Or it could be an existing character that has a different relationship with Percy in this fan - created narrative. For example, it could be a minor character that the author decides to develop a romantic plotline for with Percy.