Perhaps there's some sort of prophecy involved. In fanfiction, a prophecy could state that either Percy or Poseidon must be defeated for the greater good. This could create a situation where they are forced to fight. Or it could be a matter of pride. Poseidon might feel that Percy has not shown him enough respect as his father, and Percy might feel that Poseidon has not been there for him enough as a father. These pent - up feelings could explode into a fight.
On the other hand, Poseidon could win the fight. But instead of punishing Percy severely, he could be proud of Percy's courage and determination. He might then take Percy under his wing in a more official way, teaching him more about his godly heritage and powers.
Well, one possibility is that Percy uses his powers of water manipulation that he got from Poseidon in unexpected ways. He might create water clones to confuse Poseidon during the fight.
In a fanfiction, the outcome could be very different from what we might expect in traditional Greek mythology. If the writer wants to show the power of human - god hybrids, Percy could be made to win. He could use his strategic thinking, his skills with his sword Riptide, and his ability to control water in unexpected ways. For example, he might be able to turn Poseidon's own power against him. But on the other hand, Poseidon is not one to be underestimated. His control over the oceans is absolute in normal circumstances, and he could simply overwhelm Percy with the sheer magnitude of his power if he were to take the fight seriously.
Annabeth is often a popular character. She could be in a story where she has to help Percy deal with his relationship with Poseidon. Maybe she gives him advice on how to handle Poseidon's overbearing nature or how to make the best use of the gifts Poseidon gives him.
In fanfictions, Poseidon often interacts with baby Percy in a very gentle and protective way. He might use his powers to create a safe environment for Percy, like a special underwater grotto where Percy can be hidden from danger. Sometimes, he sends sea creatures to watch over Percy, like dolphins or friendly sea nymphs.
In Poseidon and Percy gay fanfiction, the authors usually have a lot of freedom to shape the story. They can play with the characters' personalities and create scenarios where their relationship blossoms in a romantic way. For example, they could write about how Percy discovers new feelings for Poseidon or vice versa. It might also involve elements of Greek mythology being re - interpreted to fit this new relationship concept, like how Poseidon's powers could be used in a more tender or loving way towards Percy.
Annabeth would definitely be involved. As Percy's girlfriend, she is often by his side during his adventures. She could be the one who witnesses Poseidon's pride towards Percy and helps Percy understand the significance of it. Grover, Percy's best friend, is also likely to be there. He might provide some comical relief during the serious moments when Poseidon is showing his pride. Also, other demigods from Camp Half - Blood like Jason, Piper, and Leo could be involved. They could be in awe of Percy's new - found status with Poseidon and might interact with him differently because of it.
It can also make Percy more empathetic. Since he has such a powerful and protective father, he realizes the importance of protecting others too. He may be more likely to step in and help those in need, just as Poseidon does for him. This protection also gives Percy a sense of security that allows him to explore his own identity and powers more freely. He doesn't have to constantly worry about being alone or unprotected, so he can focus on growing as a hero and as a person.
Annabeth could be there. Since she is Percy's friend, she might come in to help Percy when he's in trouble during his growth with Poseidon. Also, other demigods from the camp could show up. They might be curious about Percy's special relationship with Poseidon and how it's affecting his growth.