Perhaps Sally betrays Percy by siding with the gods in a conflict where Percy believes the gods are in the wrong. She might think that by supporting the gods, she can ensure Percy's long - term safety, but Percy feels deeply hurt as he sees it as a betrayal of his ideals.
In a more complex plot, Sally could be under a spell or some sort of mind control. She might unknowingly act against Percy, and when Percy discovers this, he has to find a way to break the spell on his mother while also dealing with the consequences of her actions.
Percy would be extremely hurt. Sally is his mother, and her betrayal would shatter his world. He might initially go into denial, not wanting to believe that she could do such a thing.
One possible plotline could be that Sally is disowned by her family for being involved with the world of the gods. Percy then has to go on a journey to find a way to restore her family's acceptance. He might face various mythological creatures and challenges along the way. Another idea could be that Sally's disownment is part of a plot by an enemy to get to Percy. So Percy has to protect his mother and also figure out who is behind this scheme. It could also be that Sally discovers a dark secret about her family that leads to her being disowned, and Percy helps her uncover the truth and clear her name.
There could be a plotline where they are in a competition of sorts. Maybe they are both trying to prove who is more powerful in the world of horror. However, as they compete, they start to understand each other better and realize that they are more alike than they thought. Another possible plot is that they are both haunted by the same entity, and they have to work together to break free from its control.
One interesting plotline could be Percy and Sally overcoming various obstacles together. For example, they might face opposition from their families or society. Another could be them having a long - distance relationship and how they maintain their love through it. And they could also have a plot where they discover new things about each other as their relationship deepens.
One plotline could be that Ron is lured by the promise of power. He betrays Hermione to join a dark wizard or group that offers him something he desires, like more status in the wizarding world. Another could be a love triangle gone wrong. If there's a new character who Ron fancies and this person convinces him that Hermione is standing in the way of their relationship, he might betray her.
Another plotline could involve Percy having to protect the concept of Order from a powerful antagonist who wants to spread chaos. This could lead to epic battles and Percy having to use his unique connection to Order to defeat the enemy. He might also have to gather allies along the way who believe in the importance of Order.
In this type of fanfic, there could also be a scenario where Percy decides to stand up to Clarisse in a more physical way. He trains hard and when Clarisse tries to bully him again, he challenges her to a duel or a competition. Percy manages to win, earning Clarisse's respect in the process, which then ends the bullying.
In this fanfic, it could be that Percy and Jason are under the influence of a magical spell or a powerful charm. This influence makes them act against their normal moral compasses and betray their friends. The story could then focus on how their friends try to break the spell and bring them back to their side, while also dealing with the consequences of their betrayal.
One possible plotline could be Percy's struggle for survival in Tartarus. He might face various terrifying monsters and have to use his wits and powers to stay alive. Another could be his journey of self - discovery in that dark place, realizing new aspects of his abilities or his past. Maybe he also tries to find a way to escape Tartarus while also dealing with the psychological toll of being in such a desolate and dangerous realm.
One possible plotline could be that Sally has some sort of special power or knowledge that the seven need in order to complete a mission. So they meet her to enlist her help.