One plot idea could be that it's a prank gone wrong. Maybe some mischievous students at Hogwarts, thinking it's a harmless joke, tie Hermione to a desk as part of a fanfic - style dare. But then things start to get out of hand as they can't untie her quickly and she has to use her magic in a really creative way to free herself. Another idea is that it's part of a mystery - someone has tied her to the desk as a distraction while they steal an important magical item from the library near her. And a third idea could be that it's a dream sequence where Hermione is tied to the desk and she has to face her fears within the dream, like being unable to study or missing an important exam. This could be a metaphor for her insecurities about her academic success.
In this situation, Hermione would probably start by using her vast knowledge of magic. She could try a simple 'reducto' spell to break the bonds if they are physical, or a counter - spell if it's a magical binding. If that doesn't work, she would analyze the situation further. She might be frustrated at first, but then her determination would kick in. She could start looking for any loopholes in the spell or the restraints. She may also call out for help, hoping that someone nearby, like Ron or Harry, would hear her. And if she realizes that it's a prank, she would likely lecture the perpetrators on the inappropriateness of their actions while also teaching them a lesson by showing how easily she can get out of such a situation using her wits and magic.
One plot idea could be that Hermione is tied to the bed by a spell gone wrong. She was trying to experiment with a new charm, but it backfired and now she's stuck. Her friends then have to figure out how to reverse the spell. Another idea is that she's part of a magical game or competition where being tied to the bed is a challenge she has to overcome using her wits and magic knowledge.
In a fanfic, Hermione could be invited to a special event at Beauxbatons. She gets to see the beautiful architecture and unique magical practices of the school. There, she meets a Beauxbatons student who becomes her study partner. Together, they explore different ways of magic and Hermione brings some of her Hogwarts knowledge to share, creating a story of cross - school cooperation.
One plot idea could be that Hermione is in the middle of an important exam at Hogwarts but she suddenly has an urgent need to pee. She tries to hold it in while still focusing on answering the questions. Another could be during a long adventure in the Forbidden Forest, she has to find a private and safe place to relieve herself. Or perhaps she's in a wizarding library researching and the need to pee becomes a comical and desperate situation as she doesn't want to leave her precious books.
One idea could be that during detention, Hermione discovers a hidden magical artifact in the classroom. This leads to an adventure where she has to figure out its purpose and keep it safe from those who might misuse it.
One idea could be that Hermione discovers a magical LaTeX hood that has the power to enhance her knowledge absorption. She could use it while studying in the library, much to the amazement of her friends.
One idea could be that Hermione, while on a research mission in a new magical realm, accidentally stumbles into the world of assassins. She uses her magical knowledge and intelligence to either help or be hunted by the assassins. Maybe she tries to adapt some of their stealth techniques to her magic for self - defense.
Well, in a fanfic about Hermione as a Playboy model, it could start with her getting an offer she initially refuses. But then, maybe due to some financial need or to prove a point about female empowerment, she accepts. The story could then detail her experiences on set, how she interacts with the photographers and other models. There could be a sub - plot about her friends' reactions, like Harry and Ron being completely shocked at first, but then coming to support her as they see her take control of this new situation and use it for good.
One plot idea could be that Hermione, through some magical mishap, ends up in the Marvel universe and meets Steve Rogers. She could use her magic to help the Avengers in a battle against a powerful enemy that their technology can't handle. For example, she might use a spell to contain a powerful energy source that was about to explode and destroy a city.
Perhaps it's a scenario in a time - travel fanfic. Hermione goes back in time and is mistaken for a criminal. Her arms are tied as a precaution. This then leads to her having to use her wits and non - magical skills to escape and set things right. It could be an interesting exploration of her character outside of her typical magical abilities.