Well, it could start with Percy feeling a pull towards Calypso again. He goes to her island against all odds. When he arrives, Calypso is overjoyed. They quickly decide to get married. For the wedding, Calypso weaves a dress from the most beautiful fabrics on the island. Percy finds a ring made of a special sea - shell. Their wedding is witnessed by the stars and the sea. After getting married, they work together to make the island a better place, with Percy using his powers to bring fresh water and Calypso using her magic to grow more bountiful crops. It's a love story that defies the odds.
One possible plot could be that after all his adventures, Percy somehow finds his way back to Calypso's island. They start to reconnect and realize their feelings have deepened over time. Calypso, who has been alone for so long, is hesitant at first but Percy's determination wins her over. They then have to face the challenges of getting the approval of the gods, especially since Percy has a history with some of them. Together, they overcome these obstacles and finally get married in a ceremony attended by their friends from the demigod world and some friendly spirits from Calypso's island.
In some fanfictions, their interactions are filled with a bit of tension. Calypso, having been alone for so long, may be hesitant to fully trust Percy at first. But as he continues to visit her and bring her lemons, she slowly warms up. They start to share stories, with Percy telling her about his adventures at Camp Half - Blood and Calypso sharing her knowledge of the island's secrets. Their relationship builds over time, and the lemons can be seen as a symbol of their growing bond.
He could get a magical shield that can not only block attacks but also absorb the power of the enemy's blows and use it for his own attacks later. For example, if a fire - breathing monster attacks, the shield could absorb the fire energy and Percy could then release it as a counter - attack.
Their relationship could develop through shared experiences. For example, they might go on a quest together to find a lost relic. During this quest, they learn more about each other's strengths and weaknesses and grow closer.
One possible plot could be that after Percy's adventures in the main series, he somehow finds a way to return to Calypso. They then have to deal with the challenges of their different worlds. Calypso is a Titan, and Percy is a demigod. Their relationship might be frowned upon by some, and they have to fight against those who oppose it.
It might be that in the fanfiction, Calypso represents something that Percy has come to dislike. Maybe she is associated with a force or an idea that Percy opposes, like a form of confinement if she tries to keep him on the island in a more extreme way than in the original tales.
One scenario could be during a training session at Camp Half - Blood. Maybe he's sparring with a new camper who has an unexpected fighting style and accidentally lands a hard blow on Percy. Another is when he's exploring an old, cursed temple. There could be traps that harm him, like poisoned darts that hit his leg. Or he could be in a fight with a mythical creature that has a special power to cause internal damage, like a basilisk's stare which might make his eyes and head hurt terribly.
A great plot might involve Percy and Calypso going on a quest to save a group of demigods. Along the way, they face various monsters and challenges, and their relationship deepens as they rely on each other. They could also discover some hidden secrets about the gods during this quest.
One common plotline is Calypso seeking revenge against the gods who trapped her on the island. This gives her a more assertive role compared to the original story. Another is her trying to find a new place in the world of demigods after being freed.
Yes, in a lot of cases. Good fanfiction writers manage to flesh out the relationship. They often give more backstory and internal thoughts to both characters. For example, they might describe how Percy is conflicted between his feelings for Calypso and his loyalty to Annabeth. This makes for a very interesting read and shows that the romance in fanfiction can be well - written.