In a 'sakura beats up sasuke fanfic', perhaps Sasuke returns to the village after a long time but with a new, more cold - hearted attitude. He might dismiss Sakura's feelings for him again and even disrespect the efforts she has made to keep the village safe in his absence. This could be the tipping point for Sakura. Fed up with his behavior, she uses her medical ninjutsu knowledge to target his weak points during the fight and beats him up to show him that she's not the same weak girl he once knew. Also, it could be a way for her to finally get some closure on their complicated relationship.
Maybe Sasuke says something really offensive about their past or her skills, and Sakura just snaps and starts beating him up.
I'm not sure about a specific 'sakura beats up sasuke fanfic'. You could try searching on fanfiction websites like Archive of Our Own or FanFiction.net.
One possible plot could be that Sasuke decides to leave the village again for some reason, and Sakura tries to stop him. This leads to a heated argument where they discuss their past, their relationship, and Sasuke's goals. Sakura might be trying to convince Sasuke to stay for the sake of their friendship or something more, while Sasuke is firm in his decision.
Maybe Sakura gets angry at Naruto for some misunderstanding, like he accidentally ruins one of her important medical experiments. So she decides to beat him up to teach him a lesson.
Well, in such a fanfiction, perhaps Sasuke has some sort of plan that involves Hinata in a negative way. Naruto discovers this and decides to beat up Sasuke to protect Hinata. It could also be part of a bigger struggle where Sasuke's actions are seen as a threat to the future Naruto envisions with Hinata, so Naruto takes matters into his own hands to stop him.
One possible reason could be that Sakura has finally grown tired of Sasuke's aloof and cold behavior towards her. She might have realized that she has been constantly chasing after him while getting little in return, so she decides to ignore him as a form of self - preservation.
A plot could be that Sasuke and Sakura are at a training camp. They have been working hard all day. At night, they are in their separate tents. But Sakura can't sleep because she is worried about Sasuke over - exerting himself. She goes to his tent and finds him already asleep. She decides to stay there, just to make sure he's okay. Eventually, she falls asleep beside him, and in the morning, Sasuke wakes up first and is a bit surprised but also feels a warm sense of comfort seeing her there.
Well, it could be that Sakura finally realizes she's been chasing after Sasuke for too long and decides to move on. Maybe she starts focusing on her own life, her ninja skills, and her friendships more. And she just ignores Sasuke's actions that night as part of her newfound independence.
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.