There's also 'Poseidon's Promise'. This fanfic delves into how Poseidon made a secret promise to protect Percy in a way that goes beyond the normal godly duties. It has some really cool action scenes where Poseidon uses his powers to fend off threats to Percy. It's a great read for fans who want to see more of Poseidon's protective side.
Perhaps Annabeth's dad has some old - fashioned ideas. He might believe that Percy doesn't have the right qualities to be with his daughter. He could also be jealous in a way. Percy is an important person in Annabeth's life and her dad might feel left out or that Percy is taking his place in a sense.
His dad might be initially shocked but quickly become accepting. After all, he is a god and has seen many strange things. He would probably use his power to make Percy's life easier during the transition, like providing resources or protection.
One possible plotline could be that Percy has to keep his fatherhood a secret to protect his child from the various threats in the demigod world. Maybe he discovers he has a child from an old relationship and has to balance his new role as a dad while still being a hero.
Well, at first, Annabeth's dad might be quite hostile. He'd be worried about his daughter getting involved with someone like Percy who is constantly in danger. But if Percy shows his loyalty to Annabeth and his good nature, like by being polite and showing respect for Annabeth's family, her dad could gradually change his attitude. Maybe he'd start to see Percy as a brave young man who can protect Annabeth rather than a threat.
Another theme is the over - protective father. In these fanfictions, Poseidon is extremely protective of Percy. He might go to great lengths to keep Percy out of danger, even if it means going against the other gods. This often leads to some tense moments between Poseidon and the other Olympians, and also shows the depth of his love for Percy.
In this fanfiction, Percy's dad is central. But there could also be some side characters among the mortals. For instance, there could be a skeptic mortal who doubts the existence of gods and is very resistant to believing that Percy's dad is a god. Then there's Percy, who might play a role in getting the mortals to accept his dad. His presence could add more depth to the interactions between the mortals and his dad.
Well, it could go in many directions. Maybe the mortals are initially frightened when they encounter Percy's dad. But as they get to know him better, they realize he has a softer side. They could end up forming an unlikely friendship. The fanfiction might also show how Percy's dad tries to blend in with the mortals while still maintaining his godly essence.
Perhaps Percy is a single dad because his partner was lost in a battle against the Titans or some other great evil. In the fanfiction, he could be dealing with the grief of that loss while still being a great father. He might take his child on adventures around the places he used to go as a teen demigod, like the Labyrinth, but this time it's to teach his child about their heritage and how to survive in a world full of mythological threats.