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.
In a Sasuke proposes to Sakura fanfic, the plot could start with Sasuke feeling a sense of guilt for all the pain he has caused Sakura in the past. He decides to make it up to her by showing her his true feelings. He starts by doing small things like bringing her flowers from his travels. As their relationship slowly rebuilds, he finally gets the courage to propose to her. He does it in front of their friends and family in the village to show that he is committed to her and wants to be a part of the village life again with her by his side.
Maybe Sasuke has been secretly planning the proposal for a long time. He starts by taking Sakura on a journey to different places they've been to in their past adventures. Along the way, he drops little hints. When they reach a beautiful, secluded spot by a waterfall, he gets down on one knee. He tells Sakura that she is the only one who has truly understood him and that he wants to spend the rest of his life with her. Sakura is shocked but then hugs him tightly and accepts.
A really romantic scene could be when Sasuke takes Sakura to the top of a mountain at sunset. The view is breathtaking, and as the sun casts a warm glow over them, Sasuke gets down on one knee and presents the ring. Another romantic scene might be when he writes her a heartfelt letter, pouring out all his feelings, and then at the end of the letter, he asks her to marry him. Sakura reads it with tears in her eyes and says yes.
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.
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.
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.