Well, the plot could start with Sakura realizing she's pregnant. She tells Sasuke, and at first, he's a bit shocked but then quickly becomes determined to be a great father. As the pregnancy progresses, they face various challenges. Maybe there are some old enemies who resurface and target Sakura because of her pregnancy. Sasuke has to fight them off while also taking care of Sakura. And throughout the story, their love for each other and their unborn child grows stronger.
In such a fanfic, Sasuke may begin by protecting Sakura in a very showy way. For example, during a small skirmish in the village, he jumps in front of her to block an attack in a really dramatic fashion. Then, he starts to be more physically close to her than he used to be, like standing really close when they talk or gently brushing his hand against hers. He would also open up to her about his inner thoughts and emotions that he has kept hidden for so long, which would draw Sakura closer to him as he seduces her.
One possible plot could be that Sasuke leaves Sakura to pursue a solo mission of redemption. He feels that his past actions have left a stain on his honor and he must atone for them alone, believing that being with Sakura would only hold him back from his self - imposed penance.
The plot might involve Sasuke finally understanding the true value of Sakura's love. He could plan an elaborate proposal. He might take her on a trip to all the places that were significant in their relationship, like the place where they first met as kids. And at the end of this journey, he proposes to her under a cherry blossom tree, which is symbolic of their relationship and also of Sakura herself.
Well, it could be about Sakura's relationship with her fiance. Maybe they have a really cute and domestic story, like planning their future together, dealing with family stuff, and having their own little adventures that have nothing to do with Sasuke. For example, they could be traveling to new places, trying new hobbies together, or just spending cozy evenings at home.
One possible plot could be that Sasuke and Sakura are partners in the police force. They might be assigned to solve a complex case involving a powerful criminal organization. Sasuke, with his sharp instincts and combat skills, and Sakura, with her intelligence and medical knowledge, would make a great team. They could start off having some differences in their approaches, like Sasuke being more impulsive in chasing down leads, while Sakura wants to be more methodical. But as the story progresses, they learn to work together better and eventually solve the case.
One possible plot could be that Sakura is a mermaid who saves Sasuke from drowning. Sasuke, a human, then becomes intrigued by this mysterious mermaid. He starts to visit the shore where he first met her often, and they gradually form a bond. As time passes, they face challenges like Sakura being hunted by mermaid hunters and Sasuke having to protect her while also dealing with his own human world problems.
One possible plot could be that Sasuke has some sort of misunderstanding. Maybe he believes Sakura has some information about a threat to Konoha that she's not sharing, so he kidnaps her to force her to talk. Then Sakura tries to convince him that he's wrong while also trying to understand why Sasuke has become so extreme.
Well, it could be about their journey to find a lost ninja art. They might face various challenges and enemies along the way. Their relationship could also develop during this journey, from just being comrades to something deeper.
One possible fanfic could be where Sasuke and Sakura's relationship has developed to a point where they are expecting a child. It could focus on Sakura's journey through the pregnancy, her emotions, and how Sasuke is dealing with the upcoming addition to their family. Maybe it shows Sasuke becoming more protective and Sakura being excited yet a bit nervous about motherhood.
Another aspect could be that Sakura's pregnancy changes Sasuke in some ways. He might become more in touch with his human side, realizing the importance of family. They could also face internal struggles within their relationship. For example, Sasuke might be afraid of hurting Sakura or the baby accidentally because of his vampire strength. But through it all, their love for each other and the anticipation of their new family member keeps them going.