It's possible that they could play some simple games during the sleepover. Since they are shinobi, they might even have some friendly competitions related to their ninja skills, but in a very light - hearted way, like seeing who can do a simple jutsu faster without using too much chakra.
There could be a story where an old enemy of Sasuke resurfaces. This time, the threat is not just to Sasuke but also to Sakura and Sarada. They have to work together as a family to defend themselves. Sasuke uses his combat skills, Sakura her medical ninjutsu and Sarada combines what she has learned from both parents. It's a story of family unity in the face of danger.
Perhaps they would have a food fight. Percy could use his powers to control the mess, like making the flying food bits form cool shapes in the air. His friends would be laughing hysterically.
One interesting scenario could be that Sakura tries to cook for Sasuke during the sleepover. Since she has improved her cooking skills over the years, she wants to surprise him with his favorite dishes. Sasuke, on the other hand, might be a bit hesitant at first but then really enjoys the food.
One possibility is that the story could focus on the emotional journey of the characters. For example, if Sakura is pregnant, she might be worried about how her friends and the village will react. Naruto could be there to support her, offering his positive energy and friendship. Sasuke might be more reserved in his support but still be there in his own way.
In this fanfiction, Sasuke might be shocked to see how much Sakura has changed in the future. Maybe she has become a more powerful ninja, or perhaps she has achieved great things in the medical field, which could make Sasuke view her in a whole new light.
They might have a very emotional moment. Sasuke could finally open up about his long journey and all the things he has been through. Sakura, on the other hand, would be so happy to see him again and might just break down in tears. They could share a long hug, a hug that they both have been waiting for for so long.
One possibility is that Naruto and the others would immediately start a search and rescue mission. They would follow Sasuke's tracks and try to figure out his motives. Sakura, on the other hand, might try to reason with Sasuke during the kidnapping. She could remind him of their past friendship and the bonds they once shared.
In this fanfiction, Sasuke might be really nervous when meeting Sakura's parents. He could be worried about making a good impression. Maybe he would bring a small gift, like a flower from his clan's garden.
In fanfiction, Sasuke's shadow snakes wrapping Sakura could lead to a very tense situation. It might be a part of a battle scenario where Sasuke is initially hostile towards Sakura. Or perhaps it's a miscommunication, and the snakes are used to restrain her before Sasuke realizes his mistake. It could also be a dark - themed fanfiction where Sasuke has turned evil and the snakes are a symbol of his new, menacing power over Sakura.
In this fanfiction, Sasuke and Sakura might have a chance encounter in the high school hallway. Sasuke could be his usual cool self while Sakura might blush seeing him.