In fanfiction, a possessive relationship between them could be developed through their dialogues. Itachi might say things like 'You should stay with me, Sakura. I can keep you safe' in a very intense way. Sakura, in response, could either be drawn to his protectiveness or feel suffocated. And this dynamic can be further explored as the story progresses. Also, the author could use the setting to enhance this possessive relationship. If they are in a dangerous place, Itachi's possessiveness would be more understandable and Sakura's reaction to it would be more complex.
It can be shown through Itachi's actions. For example, he might not allow other characters to get too close to Sakura. He could give warning looks or subtly use his power to keep others at bay.
The possessive relationship can be portrayed by their body language. Itachi might always stand a bit too close to Sakura, or his eyes might follow her every move. Sakura might start to rely on Itachi's presence, even if she doesn't fully understand his possessiveness at first. As the story unfolds, this body language can change depending on the events and their growing understanding of each other. For instance, if there is a threat to Sakura, Itachi's body language might become even more possessive, like a shield around her.
Their relationship could start with Itachi being a silent protector. He might observe Sakura from afar, and she gradually becomes aware of his presence. As time passes, she starts to trust him, and this trust is the first step in their relationship development.
Often, it's portrayed as a deep and somewhat mysterious bond. They might be able to sense each other's presence from afar. This could add an element of intrigue to the story, as they try to figure out why this connection exists.
In fanfiction, their possessive relationship can be developed through external threats. Let's say there's a new enemy who is specifically targeting Sakura because of her relationship with Gaara. Gaara becomes extremely possessive and protective, not allowing her out of his sight. Sakura, seeing his worry, also becomes possessive of their time together and doesn't want to be separated from him even for a moment. As they face this threat together, their possessive feelings grow stronger and their relationship deepens.
Jealousy can be shown through actions. For instance, if Sakura is jealous, she might avoid Itachi. She could also be short - tempered when he tries to talk to her. Just like in real life, people who are jealous often act differently towards the person they're jealous about.
They could start as rivals in academics or sports. For example, if there's a science competition in the highschool, both Itachi and Sakura are determined to win. However, as they prepare, they start to respect each other's intelligence and hard work. This mutual respect could be the first step in developing a relationship.
They could start as study partners. Itachi helps Sakura with more difficult subjects like math or history. Through these study sessions, they get to know each other's personalities better. Sakura might notice how gentle Itachi is despite his cold exterior. This could lead to them having lunch together regularly, and then eventually going on outings outside of school, like to the park or the library.
In a sleeping fanfiction, their relationship can be shown through small gestures. For example, Sasuke might unconsciously reach out for Sakura in his sleep, indicating a subconscious need for her presence. It could also be that Sakura curls up closer to Sasuke while sleeping, showing her trust and love for him.
His possessiveness could be seen in his actions towards Sakura. He may be overly protective, like not allowing her to go on dangerous missions alone. He would always want to be the one to accompany her, ensuring her safety at all times. This shows that he doesn't want to share her with any potential threats that could come her way during a mission.
One possible fanfiction could involve Itachi being possessive over Sakura in a way that is born out of his need to protect her. He might see her as a symbol of hope or something precious in a dark world. Maybe he secretly watches over her, using his skills to keep her out of harm's way without her knowledge at first.
In a vampire fanfiction, their relationship might be a tumultuous one. There could be many obstacles in their way. For instance, the vampire society they live in might not accept their relationship. But through their shared experiences, like fighting against a common enemy or helping other vampires in need, they could grow closer and form a strong bond that defies the odds.