Perhaps they are in a maze or a dangerous place filled with traps. Percy accidentally triggers a trap that releases a knife - like projectile and Annabeth, seeing the danger to Percy, moves quickly to shield him from it. This would show her deep loyalty and love for Percy.
One possible scenario could be that Percy lies about a dangerous mission he's about to embark on. Maybe he doesn't want Annabeth to worry and so he tells her he's just going on a simple errand. Another could be that he lies about his feelings towards someone else in their group, like saying he doesn't trust a new member when in fact he does, just to avoid some potential conflict within the group that he thinks Annabeth would get involved in.
Well, one scenario could be that Annabeth is reminiscing about their adventures together. In the fanfiction, she might be thinking about how Percy has saved her life multiple times. For example, during their battles against various monsters. Another could be that she's thinking about their relationship, like how they first met and how their feelings for each other have evolved over time. Maybe she's considering the future of their relationship in the context of the fanfiction world.
One possible scenario could be that they are simply having a lazy morning in bed, chatting about their next adventure. For example, Percy might be talking about the latest sea monster he heard about, and Annabeth could be making plans on how to defeat it. Another scenario could be that they are recovering from a battle and finding comfort in each other's presence in bed.
One scenario could be that Percy brings in a strange and cute little magical creature that he found. Annabeth, being curious, can't help but be distracted by it. He could also start singing a really off - key song that makes Annabeth stop what she's doing and either laugh or be really annoyed, but either way, she's distracted from her original task.
One possible scenario could be that Percy sacrifices himself to save Annabeth from a powerful and deadly monster. Maybe a huge and ancient sea creature that only Percy can hold off long enough for Annabeth to escape, but at the cost of his own life.
One possible scenario is when Annabeth goes off on her own to solve a mystery or complete a task. Percy would worry about her getting into trouble without his backup. Another is when there are new and powerful monsters around that specifically target Annabeth because of her reputation. He would be worried about her facing them alone.
One possible scenario could be they sacrifice themselves to save their friends. Maybe they are facing an all - powerful enemy that can only be defeated if they give up their own lives. For example, if there is a dark force threatening to destroy their entire world and the only way to stop it is by using their combined powers in a self - destructive way.
Perhaps in the fanfiction, there are other characters who are jealous of Annabeth's intelligence or skills. So they start spreading rumors or making unfair remarks. Percy defends her because he knows her true worth and capabilities. He would stand up and say things like 'You don't know her like I do. She's always been there for all of us.'
One scenario could be that Annabeth accidentally revealed Percy's secret identity to someone he didn't want to know. This could put him in danger and make him furious with her.
One possible scenario is that Annabeth might lie to Percy about something really important. For instance, she could lie about her whereabouts when she's actually meeting someone who is not a friend to Percy. When Percy discovers the truth, he would feel betrayed and hurt.