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.
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 fanfiction, their relationship could be developed by having Poseidon be more involved in Percy's daily life. Instead of just popping in during big events, he could be there for the small things too. For instance, helping Percy with his schoolwork that involves marine biology. They could also have a project together like building a new safe haven for sea nymphs. Through this, they would bond over creating something positive. Also, Percy could start to take on some of Poseidon's responsibilities in the ocean, with Poseidon guiding him. This would not only strengthen their bond but also show Percy growing into his role as Poseidon's son.
In some fanfictions, their relationship is one of deep mutual respect. Percy, as Poseidon's son, often seeks his father's guidance. Poseidon, in turn, tries to protect Percy from the many dangers in the demigod world while also teaching him about his powers.
The relationship can also be shown as very loving. Poseidon might secretly watch over Percy and be proud of his son's achievements. He could send signs of his support during Percy's battles or quests. And Percy, in turn, is always eager to make his father proud and show that he is a worthy son of Poseidon.
In some versions, Poseidon might keep Percy's mother at a distance to protect her from the wrath of the other gods. He could send her gifts secretly to let her know that Percy is okay. For example, he might send a magical seashell that can communicate with Percy.
Well, clearly Percy and Poseidon are the main characters. Percy, as a baby, is full of potential and mystery. And Poseidon, being his father, has a big role to play in protecting and guiding Percy.
One idea could be Percy as a baby having small adventures in the underwater world of Poseidon. Maybe he befriends a baby sea monster. Another could be Poseidon trying to protect baby Percy from the other gods who are suspicious of this half - god baby.
The fanfic could also explore how Poseidon's actions towards Percy affect Sally. For example, when Poseidon claims Percy as his son, Sally might have mixed feelings. On one hand, she's proud that Percy has a powerful father, but on the other hand, she's worried about the dangers that come with being a demi - god. This could create a complex dynamic between the three characters.
In the fanfiction, Poseidon's visit to baby Percy could be a very solemn occasion. Poseidon, being a god, has to be careful as his relationship with Percy's mother is against the rules of the gods. He might come to bestow some of his godly essence on Percy, which would explain Percy's natural affinity for water. He could also be there to make sure Percy has a chance at a normal life for as long as possible, so he might use his powers to hide Percy's demigod scent from other monsters for a while.
A great plot might be that Poseidon has to protect baby Percy from other mythological beings who sense his potential power. So he hides Percy in a special place where only he can find him. This could lead to all kinds of adventures as Poseidon has to fend off threats while keeping Percy's existence a secret.