Another way is that Harry will be secretive about Draco's problems or mistakes. He doesn't want Draco to get into more trouble, so he might cover up for him in certain situations. It's like he has this instinct to shield Draco from more harm, whether it's from the authorities at Hogwarts or from other wizards.
Well, in such fanfiction, Draco's possessiveness could show through his constantly trying to keep Harry within his sight. He may be overprotective and not want Harry to engage in any dangerous or potentially harmful activities without his presence. He might also be possessive about Harry's time, wanting Harry to spend most of it with him rather than on his own studies or Quidditch practice.
Well, in such fanfictions, Harry's possessiveness might show in him being overly protective of Draco. For example, he may not like Draco interacting with other people too much and always wants to be around Draco to ensure his safety or just to be close to him.
Well, in the fanfiction, Iruka may be protective by constantly checking on Naruto's well - being. He could ensure Naruto has enough to eat, is getting proper training, and is not being bullied by other villagers. He might also be protective in the sense that he gives Naruto extra attention and guidance in his ninja training, more so than he would for other students.
Often, Harry reacts with anger. He's not one to take being cheated on lightly, whether it's in a relationship or in a competition. His Gryffindor pride kicks in, and he'll want to confront Draco immediately.
He could also react with suspicion. Draco might think that Harry has some ulterior motive, especially if the confession is of a more positive nature like friendship or love. He would question Harry's sincerity and might even test him in some way.
At first, Draco's protectiveness might be born out of a sense of obligation or a newfound respect for Harry. As the story progresses, it deepens into a more emotional and selfless form. For example, he may start by just keeping Harry out of harm's way from external threats like other students' bullying. But later, he'll be there for Harry's internal battles too, like when Harry is doubting himself or dealing with the aftermath of a traumatic event. His character grows from a somewhat reluctant protector to a fully committed one.
Often, Ginny will try to insert herself between Harry and Hermione. She might constantly try to get Harry's attention when he's with Hermione or try to exclude Hermione from activities that involve Harry. In some fanfictions, Ginny might even spread rumors about Hermione to try and drive a wedge between her and Harry.
Another way her anger could manifest is by getting the school or other authorities involved. If Katsuki's actions towards Izuku are really bad in the fanfiction, Inko might go to the school principal or a hero agency to complain about Katsuki's behavior, hoping to get him to stop his mean - spirited actions towards her son.
One way their protectiveness shows is in the social aspect. Slytherins are known for their loyalty to their own. They would include Draco in all their activities and not let him feel left out. If there were rumors going around about Draco, they would quickly squash them. In dueling situations, they might form a protective circle around him, using their skills to keep any opponents at bay. And when it comes to academic competitions, they would support Draco wholeheartedly, even helping him study in secret if needed.
His jealousy could also show in his magic. Maybe he tries too hard to outperform Fleur in magic tasks or challenges. He might be constantly comparing himself to her and pushing himself to the limit just to prove that he is better, which is a sign of his jealousy.