A plot device could be Cedric getting involved in Harry's personal quests. For instance, if Harry is trying to figure out something about his parents, Cedric may insert himself into the situation, believing he can protect Harry better that way. He might also try to monopolize Harry's time for training or studying, which could lead to some tension between them as Harry might feel smothered.
Well, often there might be a plot device where Apollo gets jealous easily. So, if Percy shows any attention to other characters, Apollo would react in a possessive way. This could lead to conflicts between Apollo and those other characters. Also, the fanfiction might use the device of Apollo secretly following Percy around to keep tabs on him. He could be using his godly abilities to spy on Percy, which would add an element of mystery and drama to the story.
A plot device often used is the threat of separation. Maybe there's a situation where Draco has to go away for some reason, like a mission or a family obligation. Harry's possessiveness kicks in as he doesn't want Draco to leave. This situation can be used to really dig deep into Harry's feelings and show how far his possessiveness can go. He might try to find ways to keep Draco with him, even if it means going against rules or other people's wishes.
A typical plot device could be the influence of an outside force. Say, a kind wizard or witch comes to the Dursleys and makes them understand the importance of Harry and his magic, and then they start to love him. Also, it could be that Harry himself shows extraordinary kindness towards the Dursleys in a difficult situation, which melts their cold hearts and changes their attitude towards him.
One common plot device is the 'what - if' scenario. For example, what if Hermione had been the one to save Harry from the Dementors instead of his father's Patronus? This can lead to a deeper emotional connection between them. Another is the 'arranged - relationship' plot, where they are forced to pretend to be in a relationship for some magical reason, but end up falling in love for real. Also, the 'jealousy' plot device, where they get jealous of each other's relationships with other characters and realize their true feelings.
Well, a typical plot device is the danger that drives Harry to the Malfoys' in the first place. It could be that he's being chased by Death Eaters or some other dark force. Then, there's the element of family opposition. Their families have been enemies, so the relationship is forbidden in a sense, which adds to the drama. And often, there's the character growth aspect. Both Harry and the Malfoy character grow as individuals while falling in love, like Harry learning to see beyond the Malfoy family's bad reputation and the Malfoy learning about true friendship and love from Harry.
One common plot device is the redemption arc. Narcissa may be portrayed as turning away from the dark side, and Harry, seeing this change, is drawn to her. Another is the protection plot, like Narcissa protecting Harry for some reason, which then leads to a bond between them. And sometimes, there's a magical bond or curse that forces them to interact and eventually fall in love.
One common plot device is the introduction of a new mentor figure. This person could be an older student, a former Hogwarts graduate, or even a magical creature. They guide Harry in his studies, offer advice on how to handle difficult subjects and professors.
One common plot device is the discovery of ancient artifacts or prophecies that link Harry to Merlin. For example, a magical amulet that was once Merlin's might be found and react only to Harry. Another is the appearance of a character who knew Merlin in the past and recognizes Harry as his reincarnation.
One common plot device is mutual protection. For instance, if one of them is in danger from some dark wizards or a magical accident, the other steps in to save them. This act of heroism creates a bond of trust and friendship.
Love is a central theme, of course. But it's a possessive kind of love. The fanfictions usually show how Cedric's possessiveness affects their relationship. Sometimes it can be a source of conflict, like when Hermione wants her own space and Cedric struggles to give it to her. Also, loyalty is often intertwined with the possessive relationship. Cedric is loyal to Hermione and his possessiveness can be seen as an extreme form of that loyalty.