Shisui lost his eye due to a complex and treacherous plot. Some powerful forces were after his unique abilities, and he was betrayed by those he trusted.
In fanfiction, Naruto getting Shisui's eye could lead to a whole new plotline. It could potentially be a way to bridge the gap between the Uchiha clan and Naruto. Since Shisui was an important Uchiha, having his eye might give Naruto a connection to the clan's history and secrets. This could play a role in resolving some of the long - standing issues between the Uchiha and the rest of the village. Naruto might also use the eye's powers in unique ways, like combining it with his own Uzumaki chakra, creating new and unexpected jutsu.
He'd probably become more perceptive. Shisui's eye might enhance Naruto's ability to read situations and opponents, which would make him a better strategist in combat.
Naruto could be one of his allies. Naruto has this knack for seeing the good in people and would probably be willing to give Obito a chance to redeem himself. Also, Sakura, with her skills as a medic - ninja, could be an ally. She might help heal Obito if he was injured during the war and see the potential in him to be a force for good.
One possible motive could be to use Sakura as a bargaining chip. If he has some sort of plan against Naruto or the Hidden Leaf Village, Sakura, being a close comrade of Naruto, could be very useful. He might think that by restraining her, he can force Naruto to come to a certain location or make concessions.
Well, you could go for something like 'Itachi and Shisui: A Lemon - Infused Adventure'. This title gives the idea that there's something unique and perhaps a bit zesty about their relationship in the fanfiction. Another option could be 'Lemon - Hued Memories of Itachi and Shisui', which implies that the story might be filled with memories that have a certain flavor, like the sour - sweet taste of a lemon. And also, 'Itachi, Shisui and the Lemon - Scented Plot' could work, suggesting that the plot has an element related to this lemon concept.
One popular sakura and obito fanfiction is 'The Unseen Bond'. It delves into a world where Sakura discovers Obito's hidden past and tries to help him find redemption. Another great one could be 'Sakura's Encounter with Obito', which focuses on their chance meetings and how it gradually changes their relationship. And there's also 'A New Path for Sakura and Obito' that shows them working together to face challenges in the ninja world.
The sad story of Obito and Rin is a key part of the Naruto narrative. Obito was a young ninja with big dreams and a huge crush on Rin. When Rin was seemingly killed in front of him, it shattered his world. He thought that the ninja world was full of pain and betrayal. This led him to be influenced by Madara. He became one of the main antagonists, all because of his love for Rin and the unbearable pain of losing her. His journey from a hopeful young ninja to a vengeful villain is a tragic consequence of Rin's death.
One good fem Itachi x Shisui fanfiction is 'The Bond Beyond'. It beautifully portrays their relationship in a unique way. The story focuses on how their friendship evolves in a world where Itachi is female. It has great character development and some really touching moments.