It could also develop through conversations. Maybe Sakura starts asking Kakashi about his past, his beliefs, and his training methods. As he answers her questions, they grow closer. And Kakashi might start sharing some of his own insecurities with her, which makes their bond deeper.
In a fanfiction, their relationship might develop because of Sakura's determination. She could be constantly trying to prove herself to Kakashi. At first, he might be a bit dismissive, but as she perseveres and shows real growth, he begins to respect her more and more. This mutual respect could then turn into a strong friendship or even something more as the story progresses.
Their relationship could develop through shared experiences. For example, if they are both involved in a battle against a powerful enemy. Kakashi might protect Sakura at first, but then she could surprise him with her own skills and courage, and from that point on, he would start to see her as a more equal partner.
As they go on more missions together, they could develop a deeper bond of trust. Sakura might save Kakashi from a dangerous situation, like a trap set by the enemy. This would make Kakashi see her as an equal rather than just a protege. They would start to rely on each other more and more, sharing their thoughts and fears during missions.
At first, Kakashi might be a bit distant in the relationship, not really knowing how to handle having a young girl to take care of. But Sakura's determination and eagerness to learn would draw him in. He would start to open up more to her, sharing his knowledge and experiences. Sakura, in turn, would become more confident with Kakashi's support. They'd likely have a relationship based on mutual respect and a shared love for the ninja way. For example, they could have deep conversations about the meaning of being a ninja during their training sessions.
Their relationship would likely start off a bit rocky. Kakashi is a proud and skilled ninja even as a young boy, and Naruto coming in to train him might be seen as an intrusion at first. But as Naruto shows his genuine care and his own amazing skills, Kakashi would start to respect him. Eventually, they'd become like brothers, with Kakashi looking up to Naruto in some ways.
At first, they might be wary of each other. Kakashi, being from a world of ninja, would be cautious around a witch like Lily. But as they start to share their stories and experiences, they could develop a mutual respect. For example, Lily could be impressed by Kakashi's combat skills and his loyalty to his comrades, while Kakashi might admire Lily's strong will and her ability to use magic for good. This mutual admiration could gradually turn into friendship and perhaps something more as they face challenges together.
One way to develop their relationship could be through mentorship. Kakashi, as the teacher, could start by seeing the potential in the student OC. He might give her special training, which gradually builds trust. For example, he could teach her a new jutsu and during the process, they start to understand each other better. Then, as the OC grows stronger, Kakashi might start to see her as more than just a student, and there could be a mutual respect that slowly turns into a deeper connection.
If they travel to the past, Kakashi might see Sakura in a new light. In their original time, he saw her as a student, but in the past, she could show different skills and a more mature side, which could make him respect her more as an equal. Their relationship could become more of a partnership rather than a teacher - student dynamic.
At first, Sakura might be a bit intimidated by Kakashi. But as she becomes stronger and more confident, she starts to challenge him in a friendly way. Kakashi is intrigued by this new side of her. They could be paired on various missions where they have to rely on each other's skills. Sakura's medical skills could save Kakashi's life at some point, and this would make him see her in a different light. They would then begin to seek each other out more often, going for walks in the village and slowly falling in love before considering marriage.
They would become more united as they are co - parenting. They would have to communicate more often about the child's upbringing, training, and future. Their relationship would likely become deeper and more complex as they share the joys and challenges of raising a child.
Their relationship could develop through mutual respect. As they work together on Anbu missions, they come to appreciate each other's strengths. For instance, Kakashi might admire Sakura's determination and her growth as a ninja, while Sakura could respect Kakashi's wisdom and combat experience.
In fanfiction, the possessive relationship can start with Kakashi noticing Sakura's growth and potential. He might become possessive as he sees her as a valuable asset to the team and someone he wants to protect at all costs. For example, he could start giving her special training, but in a way that shows his possessive nature, like not allowing others to interfere with her training time.