A fanfic could be centered around a magical plant that has the power to cure lycanthropy. Remus hears rumors of this plant in the Forbidden Forest. He ventures in, facing various magical creatures and dangerous terrains. When he finally finds the plant, he has to figure out how to use it properly. This could involve a series of trials and errors, and perhaps some help from Hagrid who knows the forest well.
One possible fanfic could be about Remus Lupin's search for a permanent cure to his lycanthropy. It might involve him traveling to far - off places, meeting with ancient healers or magic users who claim to have the knowledge. Maybe he teams up with some of his old Hogwarts friends like Sirius or James in flashbacks, and they try to find a cure together. This would add an element of friendship and adventure to the story.
Remus might become more submissive in a way. Since he is now Harry's familiar, he has a certain obligation to follow Harry's lead. However, he would still retain his intelligence and wisdom. For example, in a battle, he might be more likely to wait for Harry's command rather than act on his own instincts immediately.
Perhaps in this fanfic, there is some sort of danger in the wizarding world that can only be overcome by Harry and Remus having this special familiar - master relationship. Harry might turn Remus into his familiar to protect him from a dark force that is specifically targeting werewolves. As they navigate this new dynamic, they also have to deal with the reactions of their friends and the wizarding community at large. The story could explore themes of acceptance and the power of unconventional relationships.
One possible plot could be that L, with his extraordinary detective skills, discovers a plot against Harry Potter early on. He might use his intelligence network to find out about Voldemort's plans and then intervenes at a crucial moment. For example, when Harry is about to be attacked by Death Eaters, L shows up and uses his strategic mind to outwit them and save Harry.
Well, it could lead to some really interesting magical adventures. Maybe Harry would have Remus in an animal form to help him with certain tasks or investigations. Remus, in his familiar form, might be able to access places that are difficult for humans to reach, providing Harry with valuable information.
One conflict could be the ethical implications of turning a human into a familiar. In the wizarding world, there are likely rules about this sort of magic, and Harry might face consequences for his actions.
Well, one possibility is that Harry discovers a new magical ability that allows him to make a familiar. He chooses Remus because of their strong bond. Then, they might have a deeper connection in battles, with Remus being able to sense Harry's needs and intentions more acutely. Maybe Remus could also gain some new powers or abilities as Harry's familiar, which would be really interesting to explore in the fanfic.