It could be an old rival from Percy's past, someone who has always been jealous of Percy's abilities and has finally found a way to cause him great harm. This person would be a perfect antagonist as Percy would have a strong motivation to get revenge on them.
In this fanfic, Percy could be driven to revenge because of a personal loss caused by the Olympians. He might start by infiltrating Olympus under a false identity. Once inside, he begins to subtly undermine the gods' authority. He could spread rumors among the minor gods and spirits, causing unrest in the divine realm. As the chaos builds, Percy's revenge plot unfolds, leading to a big showdown between him and the Olympians.
Annabeth could be his ally. She's always been by Percy's side and if he has a just cause for revenge against the Olympians, she would likely support him. Her strategic mind would be a great asset in planning against the gods.
One idea could be that Percy discovers the true identity of the person who wronged him and plans an elaborate ruse to publicly expose them. This would not only get revenge but also ruin their reputation.
Percy could be a young boy who has just moved to a new neighborhood. He's shy and misses his old friends. So, when he meets a friendly neighbor, he wants to cuddle as a way of showing his need for friendship and comfort.
Another theme is power. In many of these fanfics, Percy discovers new powers or uses his existing ones in creative ways during his revenge plot. It shows his growth and his ability to stand up to those who underestimate him. For instance, he might use his control over water in unexpected and powerful ways.
One possible reason could be a sense of betrayal. Maybe Naruto discovers some dark secrets about Konoha that make him feel deceived. For example, if he found out that the village had been using him all along without truly caring for his well - being.
The story could start with Naruto slowly distancing himself from Konoha. He might start by not taking on any more missions for the village and instead focus on building his own power. For example, he could seek out new jutsu training from other places or with rogue ninjas who oppose Konoha.
One possibility is that Annabeth has to face some challenges to prove to Percy that she truly wants him back. She could be on a quest to find something important to Percy, like a lost item from his past. This would show her dedication. Also, there might be some new characters in the fanfic who try to stop her from getting back with Percy, adding more drama to the story.
A great plot could involve Percy being a character in a magical world. He's been on a long and dangerous adventure and has finally returned home. All he desires is to cuddle with his family or his beloved pet. The fanfic could then focus on the tender moments of their reunion, with lots of hugs and cuddles, and Percy finally feeling safe and loved in their embrace.