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.
The novels about the man serving the woman under the desk generally belonged to the romance, love, or urban emotional novels. The plot might describe a man working in a company to cater to the needs of the female lead, providing various services after work, and finally the relationship between the two gradually warmed up. This type of novel often involved topics such as workplace, love, marriage, family, etc. It had a certain practical significance and enlightenment.
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.
One possibility is that this is a misnomer or a very tongue - in - cheek title. In the fanfiction, it could be that Harry is using some new form of magic under Snape's desk that has an effect that can be humorously described as'sucking'. For instance, he could be using a spell to draw out negative magical energy that has accumulated under Snape's desk, which is causing problems in the classroom, and the spell's action makes it seem like he's'sucking' something out.
I'm not sure specifically which ones are the most popular for this rather unusual scenario. Fanfiction varies greatly in popularity and availability. However, you can start by looking on major fanfiction platforms like Fanfiction.net or Archive of Our Own. Search for the exact phrase 'Harry Potter Forced Under the Desk' and browse through the results to find ones that seem interesting to you.
Well, it could be a story where there's some sort of danger in the classroom, like a sudden spell gone wrong, and Miss Granger is told to get under the desk for protection. Maybe the teacher has a premonition and wants to keep her safe from the chaos that's about to ensue.
I'd say it's quite creative in a rather odd way. The combination of characters and the strange situation described makes it stand out. It immediately grabs your attention, even if it might be a bit difficult to understand exactly what it means at first.
When writing this fanfiction, you need to stay true to the original Harry Potter universe in terms of the rules of magic, the personalities of the characters, etc. For example, Harry is brave but also impulsive at times. You can start with a strong opening that immediately grabs the reader's attention, like a sudden chaos that leads to Harry being forced under the desk. Then, build the plot gradually, with some twists and turns. Maybe the desk is not an ordinary desk but has some secret magical powers. As you write, use vivid descriptions to make the story come alive, like describing the dusty underside of the desk and Harry's feelings of confinement.