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.
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.
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.
This is completely inappropriate. Fanfiction should be about exploring characters in a way that is in line with basic human values. This kind of description goes against decency and respect, and it is not something that should be part of any fan - based creative writing.
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 about Harry finding a hidden magical object under Snape's desk. Maybe it's a potion ingredient that Snape has been secretly guarding. Harry, being curious, decides to investigate further and gets into all sorts of trouble as a result.
Some fanfictions might suggest that there are hidden portraits under his desk. These portraits could be of his family members or people he once knew and cared about. They could be whispering advice or secrets to him when no one else is around.
One negative impact is that it spreads immoral and vulgar ideas. It can also make the original work's fan community look bad as it goes against the positive and creative nature that fanfiction should have.