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.
Perhaps it's a comical scenario where Sakura is under the desk because she's trying to avoid Naruto who's being overly enthusiastic. And the 'pop' part could refer to something suddenly appearing near the desk that adds to the chaos of the story.
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.
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.
In this fanfic, the desk could be a special place. For example, it was the place where Naruto proposed to Sakura. Now, as they are engaged, Sakura is sitting at the desk looking at their engagement photos and she moans because she realizes how much their relationship has grown and how much she loves Naruto. The story could then go on to tell about their upcoming wedding preparations and their hopes for the future together.
I'm not sure there's an official fanfic with such a specific title. However, if it were to exist, it might be about Naruto and Sakura in a situation where there's some sort of emotional outburst (the moan part) related to a desk and perhaps the idea of a fiance. It could be a very creative and unique take on their relationship, exploring new aspects of their bond in a fictional scenario.
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.
In some fanfictions where Sakura adopts Naruto, it could be about Sakura seeing Naruto's need for a family. Maybe she decides to take him in after realizing how alone he has been. This can lead to a lot of character development for both of them. Naruto might start to heal from his past traumas, and Sakura could grow into a more nurturing figure.
One possible plot could be that Naruto and Hinata are working on a mission together in a hidden room with a desk. They bend over the desk to study some ancient scrolls that hold the key to defeating a new enemy. As they pour over the scrolls, they start to have deep conversations about their past, their dreams, and their feelings for each other. Their bond grows stronger as they decipher the scrolls and come up with a plan to save the village.
Maybe Naruto showed up late to a team meeting again. Sakura, who is always punctual, pouts at him as a sign of her disapproval. In the fanfiction, this could lead to a series of events where Naruto tries to make it up to her and in the process, they strengthen their friendship or even develop deeper feelings for each other.
One possible plot could be that Naruto decides to sing to Sakura to confess his love. He might choose a beautiful, secluded spot like the top of Hokage Rock. He sings a song that he has written himself, pouring all his unspoken feelings into the lyrics. Sakura is initially shocked but then starts to really listen and understand Naruto's deep emotions for her.
In such a fanfiction, perhaps Sakura would teach Naruto better chakra control from an early age. Since she's very studious, Naruto might become more academically inclined too.