In this fanfic, the story might involve Percy having to go on a quest to find a special ingredient to heal Artemis. Along the way, he faces various challenges and overcomes them with his wits and the help of his friends. When he finally gets the ingredient, he uses it in a ritual that combines his demigod powers with some ancient magic to heal Artemis.
Well, it could start with Artemis being poisoned by a new kind of monster. Percy, being the hero he is, senses her distress. He decides to heal her using his connection to Poseidon. He dives deep into the ocean to find a special sea plant that has the power to neutralize the poison. He then brings it back and, with the help of some of Artemis' hunters, administers the cure to her.
One possible plot could be that Percy comes across a disabled Artemis in a situation where she has lost some of her powers. He could help her find a way to regain them while facing various mythological threats. For example, they might have to battle a new kind of monster that is taking advantage of Artemis's weakened state. Along the way, Percy discovers more about the true nature of the gods and their vulnerabilities.
His power over water could also be used in a more spiritual way. He could communicate with the water spirits and ask them for help in healing Artemis. The water spirits might then infuse the water Percy uses with their own magic, making it more potent for healing. Percy could then use this enchanted water to heal Artemis' internal injuries as well as external ones.
One possible plot could be Percy having to defend Artemis from a new and powerful enemy. Maybe a primordial being has awakened and is targeting Artemis. Percy, with his skills and the help of his friends, must fight this enemy. He could also have to deal with the politics among the gods as he tries to protect Artemis, since some gods might not be so happy about his interference.
In this fanfiction, it could be that Artemis is in a situation where she is about to be killed or lose her powers forever. Percy, being the selfless hero he is, takes on a deadly task to prevent that from happening. Maybe it involves facing an ancient and malevolent god who has a vendetta against Artemis, and Percy uses his unique abilities and the element of surprise to try and stop this god, but at the cost of his own life.
Well, it could involve Percy being tasked with protecting Artemis in a way that goes against his normal alliances. Maybe some dark force is after Artemis and Percy has to use his skills in a new and unexpected way.
One possible plot could be that the son of Artemis discovers a threat to the demigod world that is related to his mother's domain. He then seeks out Percy for help because of Percy's reputation. Together, they embark on a journey to find a magical artifact that can stop the threat.
In a 'Percy Jackson adopted by Artemis' fanfiction, perhaps Percy is exiled from Camp Half - Blood due to false accusations. Artemis, who has always been intrigued by Percy's courage, takes him in. With Artemis as his new guardian, Percy gets involved in the Hunters' battles against ancient monsters that threaten the world. He also has to deal with the jealousy of some of the other Hunters who are not happy about a male being in their midst.
It could be a story where Percy accidentally comes across Artemis' collar. Maybe he's on a quest and stumbles upon it in an ancient, hidden place. He then has to figure out how to return it to her without getting in trouble with the other gods.
A plot could involve Percy being cursed and the only way to break the curse is to sing a song that moves Artemis. He has to learn about her past, her values, and her likes in order to create the perfect song. Or perhaps Percy discovers a new power within himself - the power of song - and he decides to test it out on Artemis, not knowing how she will react. This could lead to a series of adventures as he tries to make amends if she is initially offended.
Well, it could be about Percy having to deal with the conflict of being the son of two such different deities. Maybe he has powers from both Orion and Artemis. For example, he could have Orion's hunting skills combined with Artemis's connection to the moon. He might struggle to fit in with the normal demigods as his origin is so unique.