One possible plotline could be Sasuke's revenge-driven journey leading up to the moment he kills Danzo. He might discover new secrets about Danzo's past misdeeds that fuel his hatred even more. For example, he could find out about Danzo's role in the Uchiha massacre in greater detail. Another aspect could be the aftermath of the killing. How does it affect the Hidden Leaf Village? Does it lead to chaos or a new understanding of Sasuke's motives among the villagers?
A plot could involve Sasuke infiltrating the place where Danzo is hiding. Along the way, he has to face off against Danzo's guards and various traps. Once he finally reaches Danzo, there could be an epic battle of jutsu. Sasuke might use his Sharingan to its fullest extent, while Danzo tries to use his own forbidden techniques. In the end, Sasuke's superior skills and determination lead to him killing Danzo. This then sets off a chain of events in the ninja world, with different villages reacting to the news and some seeing Sasuke as a hero, while others view him as a threat.
One possible plotline could be that Naruto discovers Danzo's dark secrets and decides he has to take action. Maybe Danzo was planning something truly evil against the village that Naruto couldn't let stand. So Naruto, with his newfound power and determination, confronts Danzo in a battle. Naruto uses his Rasengan and outsmarts Danzo's Sharingan - based jutsu to finally defeat him.
One possible plotline could be that Naruto, in his 'godlike' state, is pushed to the brink by Sasuke's actions which threaten the safety of the village. Naruto might see no other option but to end Sasuke's life to protect everyone he loves. For example, if Sasuke were to ally with a powerful and evil force that was bent on destroying Konoha, Naruto's extreme power could be the only thing to stop him.
A possible plotline could be that Naruto is influenced by some dark force or event that makes him see the world more like Danzo. For instance, if there was a new threat to the village that made Naruto believe that extreme measures were necessary. He might start to control the flow of information within the village, just as Danzo did, believing it would keep the villagers safe but actually causing mistrust among them.
Perhaps there's a mission where Kakashi and Sasuke are on opposite sides. Kakashi is following the orders of the village, and Sasuke is following his own path for revenge. In a confrontation, Kakashi uses his Sharingan - based techniques against Sasuke. Sasuke, not fully prepared to face Kakashi at that level, gets hurt. This would add more complexity to their relationship as teacher and student.
One possible plotline could be that in this nightmare scenario, Sasuke is being controlled by some dark force and Hinata, with her gentle yet determined nature, tries to break the control over him. Maybe she uses her Byakugan to find the source of the dark influence and has to fight off other threats that come her way while trying to reach Sasuke.
A possible plotline could be that they are both on a mission to rescue their kidnapped comrades. They have to work together, using their unique ninja skills. Female Sasuke with her lightning - fast attacks and Sakura with her super - strong punches.
One possible plot could be that Dark Naruto has been corrupted by some dark force, perhaps the influence of an ancient evil. This makes him see Sasuke as a threat to his new, dark vision of the world. He then uses his enhanced powers, which might include new and more dangerous forms of his jutsu, to ambush Sasuke. Sasuke, on the other hand, tries to fight back using his Sharingan and his own combat skills, but Dark Naruto's power is overwhelming.
One possible plotline could be that Naruto is forced into a situation where he has to kill Itachi to protect the Hidden Leaf. Maybe Itachi is being controlled by some dark force and Naruto, with great reluctance, has to end his life to save the village and his friends.
Well, perhaps Sasuke has to leave the village again for some mission or his own personal vendetta. He doesn't explain his reasons fully to Sakura, and she feels abandoned once more, which makes her cry. In a different scenario, Sasuke might be in a battle where he has to make a tough decision that involves sacrificing something that Sakura holds dear. When she realizes what he's done, she's heartbroken and cries. Or it could be that Sasuke is training extremely hard and pushing himself to the limit. Sakura is worried about him, but when she tries to stop him, he dismisses her concerns harshly, reducing her to tears.
One possible plotline could be that Sasuke is under some sort of dark magic or mind control when he binds Sakura with snakes. Maybe an enemy has manipulated him into doing this as part of a larger scheme against the Hidden Leaf Village. And Sakura, being the strong - willed kunoichi she is, tries to break free and also reach out to the real Sasuke within his mind - controlled state.