Maybe in the fanfic, Snape gives Hermione detention for accidentally disrupting his class. But instead of a typical punishment, he assigns her to help him organize his personal library of dark arts books. As they work together, Hermione begins to understand Snape's complex past and Snape starts to see Hermione in a new light, beyond just being a know - it - all Gryffindor.
In this fanfic's detention scenario, Snape could be in a bad mood and gives Hermione a very difficult task of brewing a complex potion. Hermione struggles at first but then uses her quick thinking and knowledge from books. Snape observes her closely and realizes that she has a lot of potential. This could be the start of a begrudging respect between them.
One possible scenario in such a fanfic could be that during detention, Snape makes Hermione clean the potions classroom. At first, Hermione is indignant but as she cleans, she discovers some old potions notes that Snape had written as a student. This leads to an unexpected conversation between them about the complexity of potions. Snape is initially cold but gradually warms up as he realizes Hermione's genuine interest in the subject.
They could start off on bad terms, with Snape being his usual strict self and Hermione being defiant. But as the detention progresses, they might find common ground. For example, Snape could notice Hermione's talent for potions and start to give her some extra knowledge or tasks related to advanced potions. This could change their relationship from one of animosity to one of a grudging teacher - student respect.
They could start by Snape giving Hermione a long lecture about her behavior that led to the detention. Hermione, being Hermione, might try to argue her case, which could lead to a tense exchange. For example, if she was late to class because she was helping a first - year student, Snape might not initially believe her.
One plot idea could be that during detention, Snape discovers Hermione's hidden talent for potion-making that even he hadn't expected. He starts to see her in a new light, not just as an over - achieving Gryffindor. Another idea is that they get trapped in the detention room due to a spell gone wrong, and they have to work together to get out, which leads to a grudging respect between them. And perhaps Hermione finds an old diary in the detention room that has some secrets about Snape's past, which she uses to understand him better.
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.
Another plot could be that Snape assigns the student to clean his office during detention. While cleaning, the student finds old parchments and journals that give insights into Snape's past, especially his time as a student at Hogwarts. The student becomes more empathetic towards Snape after learning about his difficult past and tries to befriend him, which Snape initially resists but gradually warms up to.
In fanfiction, when Snape and Hermione are in detention, their relationship could transform in several ways. Snape may be used to seeing Hermione as just another Gryffindor student who challenges his authority. But in detention, if she shows an aptitude for something he values, like a deep understanding of a particular potion or a magical theory. He could start to view her as an equal in some ways. Hermione, who has always seen Snape as a mean teacher, might find out that he has his own reasons for his behavior. Maybe he was bullied as a student too. This new knowledge could soften her view of him, and they could develop a relationship based on new - found respect and a bit of empathy.
Some fanfictions have the idea that while in detention, Harry and Snape are magically bound to work together on a special potion. This potion has the power to reveal hidden secrets. As they work on it, they start to share their own secrets, like Snape's unrequited love for Lily and Harry's fears about Voldemort. It's a really interesting way to develop their relationship.
Well, in a detention with Snape in a Harry Potter fanfic, Harry might be forced to clean out the Potions storeroom. Snape could use this time to lecture Harry about his lack of respect for Potions as a subject. Maybe he would also drop some hints about Harry's father, James, which could be both infuriating and enlightening for Harry.
One great Snape detention fanfiction is 'The Detention Chamber'. It really delves into the complex relationship between Snape and the student in detention. The author does a wonderful job of portraying Snape's strict yet somewhat sympathetic nature during the detention scenes.