They could be rivals in a sports event in the demigod camp. Percy is naturally good at water - based sports like canoeing, and Annabeth wants to show that she can beat him in any physical activity. Their rivalry could also attract the attention of other campers, some rooting for Percy and some for Annabeth.
Maybe they are rivals in a quest given by the gods. Each wants to prove themselves as the better hero. Percy uses his combat skills and connection to the water, while Annabeth uses her strategic mind and knowledge of ancient places. This could lead to some intense moments where they have to decide whether to cooperate or keep competing.
Well, for the 'Percy and Annabeth rivals at camp' fanfiction, a great plot could be that there's a mystery at the camp and they both think they can solve it first. Percy might rely on his instincts and combat skills, while Annabeth uses her intelligence and knowledge of ancient lore. Their rivalry intensifies as they race against each other to uncover the truth. Also, they could be rivals in winning the friendship of a new camper who has some special power or ability that they both see as useful for their own goals at the camp.
A possible plot could involve a magical tournament where Percy and Annabeth are on opposing teams. Their rivalry gets in the way at first, but as the tournament progresses and they see the real threats emerging, they start to cooperate in a more covert way to ensure the safety of everyone involved.
Another idea is that they are rivals in winning the favor of a powerful but mischievous god. The god sets tasks for them, and whoever completes the most tasks successfully will get a special reward. Percy's courage and Annabeth's wisdom are put to the test. This rivalry might also test their friendship as they are tempted to use underhanded tactics against each other but ultimately realize the value of their bond.
Well, a great plot could be that they find a mysterious object under their bed. It turns out to be a key to an ancient demigod treasure. So they start researching in bed, looking through old scrolls and books, trying to figure out where this treasure might be. And during this process, they also share some sweet and tender moments, reminiscing about their past adventures. Also, they could be in bed during a stormy night at Camp Half - Blood and tell each other spooky stories about the monsters they've faced, which leads to them coming up with new strategies for future battles.
They could discover a lost civilization in Tartarus. This civilization might have a way to manipulate the very fabric of Tartarus itself. Percy and Annabeth would then have to learn the ways of this civilization in order to use it to their advantage. Maybe they have to earn the trust of the civilization's leaders by helping them with their own internal problems first.
One plot idea could be Percy and Annabeth starting a new life in a small town. They could face challenges like dealing with normal high school drama while still having their heroic instincts. For example, they might have to stand up to a local bully who is causing trouble for the other students. Another idea is them going on a road trip across the country, exploring different places and having adventures that are more grounded in the mortal world, like getting lost in a big city and having to find their way back using only their wits.
Well, they could face issues like how to balance their heroic duties with their married life. For instance, Percy might get called away on a quest right when they planned a romantic dinner. Or perhaps in the fanfiction, they start a school for demigod children together as a married couple, which would bring its own set of comical and heartwarming situations.
One plot idea could be that Percy is so caught up in his own heroic deeds and adventures that he completely misses all of Annabeth's subtle hints of her feelings for him. Meanwhile, Annabeth tries different ways to get his attention, like helping him with his studies in a very flirtatious manner, but Percy just thinks she's being a good friend. Another could be Percy getting into a situation where he has to protect Annabeth without realizing his true feelings for her are deeper than friendship, and throughout the fanfic, his obliviousness slowly starts to fade as he gets closer to her in the face of danger.
One idea could be a post - quest moment where Percy and Annabeth are sitting by the Camp Half - Blood lake at sunset. They start sharing their deepest fears and hopes, and as they get closer emotionally, they hold hands and share a gentle kiss. It's a very tender and intimate moment that shows their deep connection.
One idea could be a modern-day high school AU. Percy could be the new kid at school, a bit of a loner and a troublemaker. Annabeth, on the other hand, is the top student and part of the student council. They get paired up for a project and initially clash because of their different personalities. But as they work together, they discover they have more in common than they thought, like their love for the ocean (Percy's always been drawn to it, and Annabeth has a fascination with ancient sea civilizations).