Well, it could be about Sakura hiding under a desk during a pop - up dangerous situation in the Naruto world. Maybe she's using her medical skills secretly to help an injured comrade while under the desk.
One possible plot could be that Naruto and Sakura are hiding under a desk during a dangerous situation in the ninja village. Maybe they are on a mission and things go wrong, and they have to take cover under the desk while they plan their next move.
It could be the Slytherins. They are often portrayed as the antagonists in the Harry Potter series. Maybe they're jealous of Hermione's intelligence and want to embarrass her by forcing her under the desk.
It could be Orochimaru. He might be after some valuable information that Sakura has and she has to hide under the desk to avoid him. The 'pop' could be one of his experimental creatures suddenly showing up.
Their relationship could develop in a more intimate way. Being in such a confined space like under the desk forces them to be closer physically. This might lead to them being more aware of each other's presence and start to see each other in a different light. For example, Naruto might notice Sakura's little nervous habits and find them endearing.
Sakura would be a great addition. As Sarada's mother, she could add an interesting dynamic. Also, Boruto could be included. His relationship with Sarada and his own skills could create some engaging storylines. Another good character could be Kakashi. His wisdom and combat experience could be useful in the story.
Naruto's influence would likely make Sarada more determined. His never - give - up attitude is infectious. So, Sarada might face challenges with more tenacity.
Perhaps there could be a stack of old, hand - written notes. These notes might contain his personal thoughts on magic, or his memories related to certain spells and potions. Snape is a very private person in the original stories, so these notes could be full of secrets. For example, they could be about his past relationships or his early experiments with magic that he doesn't want others to know about.
In this fanfiction, it could also be that Hermione is forced under the desk as part of a mystery. There could be some hidden secrets or clues under the desk that she needs to discover, but she's being forced to stay there against her will at first. As she investigates, she uncovers something that has far - reaching implications for the wizarding world.