I'm not sure specifically as I haven't read that exact fanfiction. But generally, it might be about Sakura facing some sort of struggle while in the grip of Tobi. It could be a physical struggle, like being held captive, or an emotional struggle due to Tobi's actions or words.
The concept of Sakura struggling in Itachi's tight grip in fanfiction is quite interesting. It could be a physical struggle, like she's trying to escape his hold. Or it could be more of an emotional or mental struggle. For example, if Itachi is using some form of mind - control or manipulation. This situation can also lead to different plot twists. Perhaps Sakura discovers a new power or ability while in this struggle, or she forms an unexpected alliance to free herself.
The plot might involve Sakura being held by Tomakazu in a way that restricts her freedom. She could be struggling because she has a different goal or belief. For example, if they are in a fictional world with different factions, and Tomakazu's grip represents his side's control, and Sakura is trying to get to her own side or do something that goes against what Tomakazu wants.
Obviously, Sakura and Tomakazu are the main characters. Sakura is the one who is struggling, so she's a central figure in the story. Tomakazu, on the other hand, is the one whose grip is causing the struggle.
It could be about Sakura being in a difficult situation while in Itachi's grip, perhaps in a battle scenario where Itachi has the upper hand physically. Maybe she's trying to break free to either save herself or someone else.
There could be many authors who might write such a fanfiction. It could be an amateur writer who is a big fan of the Naruto series and just wanted to explore this particular scenario between Sakura and Itachi.
The plot might center around Sakura's internal struggle while under Tomokazu's grip. For example, she could be fighting against his control on an emotional or mental level. It might also be part of a larger story where there are other characters and events that are affected by this situation between Sakura and Tomokazu. Say, there are friends of Sakura who are trying to rescue her from this situation.
Sakura and Kidomaru are the central characters. Sakura, with her pink hair and determined personality, is caught in a tough situation against Kidomaru. Kidomaru, on the other hand, has some sort of advantage with his grip on her. Their interaction and the way Sakura tries to overcome Kidomaru's hold are likely to be the focus of the fanfiction.