The relationship might develop through shared experiences. As the OC goes through the different stages of pregnancy, they face various challenges together. Maybe they have to deal with a difficult pregnancy and Sasuke has to be there for her, which strengthens their bond. Also, they could start planning for the future of their child, which brings them closer.
One way to develop their relationship could be through shared trauma from the war. The OC could have also been involved in the war efforts, and they start to bond over their experiences. They might initially be hesitant, especially Sasuke with his guarded nature. But as they work together to rebuild their world post - war, they gradually open up to each other.
The OC's character can be developed through her reactions to different situations. When she first meets Sasuke, how does she respond to his coldness? Does she try to break through his barriers or is she put off? With Gaara, when she learns about his past, does she pity him or see his strength? Also, give her a moral code. If she believes in always helping the weak, it will affect how she treats Sasuke when he's in a dark place and how she interacts with Gaara's people in the Sand Village. Her hobbies and interests can also be used to make her more three - dimensional. For example, if she loves cooking, she could cook for Sasuke and Gaara, and through that, their relationships can grow and develop.
The pregnancy can be a catalyst for their relationship to deepen. They might start to communicate more openly about their feelings and fears. For example, Sasuke could share his insecurities about being a father, which he has never done before, and Naruko could comfort him.
The relationship could develop as they both adjust to the new life that's coming. Sasuke might take on more domestic tasks, like building furniture for the baby's room. Hinata would be touched by his efforts. She could also teach Sasuke about the importance of family traditions during pregnancy. They would rely on each other more, and their love would be more evident as they prepare for the arrival of their child. They might also share more tender moments, like Sasuke feeling the baby kick for the first time, which would make their relationship even more special.
At first, it could be strained. Sasuke is so focused on his revenge that he might see his sister as a distraction. But as time goes on, he starts to realize her importance. Maybe when he's in a difficult situation and she comes to his rescue, he begins to value her more. Their relationship could then grow into one of mutual respect and protection.
First, create a well - developed OC. Give them a distinct personality, backstory, and goals. For example, if your OC is a healer, explain why they chose that path. Then, focus on building a believable relationship with Sasuke. Don't rush it. Show how they gradually get to know each other. Use the Naruto universe's existing elements like jutsu and clans to enhance the story.
As the OC's pregnancy progresses, Itachi may find himself changing his priorities. He might start to think more about a peaceful life with the OC and the baby. This could lead to a shift in their relationship from just being two individuals in love to a family - in - the - making. They could start making plans for their family, like choosing a name for the baby, which would bring them closer together.
One great Sasuke x OC fanfiction is 'A Bond Beyond Konoha'. It beautifully weaves a story of an original character who enters Sasuke's life at a crucial point. The OC has a unique backstory that complements Sasuke's journey. Another is 'Sasuke's Unforeseen Encounter'. This one focuses on how the OC's presence changes Sasuke's perspective on relationships. It has really well - written dialogues that bring out the chemistry between them.
To develop their relationship, start with small interactions. For example, the OC could save Halibel from a surprise attack by other Hollows. This would make Halibel curious about the OC. Then, have them exchange stories about their lives. Halibel could talk about her rise to become an Espada and the OC could share their origin story. Another way is to give them a common goal, like protecting a group of innocent Hollows from a cruel Arrancar. Working together towards this goal would bring them closer.
To develop their relationship, start with misunderstandings. Let the OC misinterpret Toyohisa's brash behavior at first. Then, as they get to know each other better, they start to see the real person behind the facade. Have them have deep conversations about their pasts, their hopes, and fears. Also, physical contact can play a role. A simple touch on the arm during a tense moment can be the start of something more. And don't forget about conflict. Maybe the OC's pacifist views clash with Toyohisa's warrior ways, but they learn to respect each other's differences.