One possibility is that Percy is in a really tough situation, like facing an extremely powerful new monster that he can't defeat on his own. So he calls Poseidon, and Poseidon might send some sea creatures to assist Percy, like a school of magical fish that can confuse the monster. Maybe he also gives Percy some temporary power boost, like the ability to control water in a more powerful way.
Well, one reason is to show the softer side of Percy. By having him call Poseidon daddy, it humanizes both characters. For Poseidon, it shows his paternal side which we don't see much in the original books. And for Percy, it can be a way to show his vulnerability and his need for a father figure. Also, it can create some really interesting plotlines, like family drama or special powers that come from their unique bond.
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.
One challenge could be that the connection between them is being blocked. Maybe some dark magic or a powerful enemy has created a barrier. So Percy has to find a way to break through this block just to get his call for help to Poseidon. Another challenge might be that Poseidon is preoccupied with his own problems in the underwater world, like dealing with a rebellion among his own sea creatures. So Percy has to convince Poseidon that his situation is also important.
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.
The relationship could be shown as a curious one. Since Percy is a baby, he might not fully understand who Poseidon is, but there could be an instinctual bond. Poseidon, on the other hand, could be filled with a sense of wonder at this small version of his son, seeing all the potential in him. He might try to communicate with Percy in gentle, non - verbal ways, like sending small ripples of water to make Percy laugh.