Well, Harry could be forced to clean the Potions classroom during detention. Snape might make him scrub every cauldron by hand while muttering about how clumsy Gryffindors are. Harry might accidentally spill a potion ingredient, which makes Snape even angrier and gives him more tasks to do, like sorting out all the potion ingredients in the store cupboard.
Harry would probably be quite resentful at first. He might think Snape is just being his usual unfair self. So, he would be sulky and do the tasks reluctantly.
In a Harry and Snape detention fanfiction, Harry might finally have a chance to understand Snape better. He could see that Snape's strictness is not just pure malice but perhaps a result of his complex past. Snape, on the other hand, could start to see Harry not just as James Potter's son, but as an individual with his own struggles. They might end up having a conversation about magic that neither expected, leading to a newfound respect for each other.
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.
Well, in fanfiction, Harry's refusal of detention could be a major turning point. It might lead to him exploring other ways to solve the problems that led to the detention in the first place. Maybe he discovers a new magic or finds an ally who helps him deal with the underlying issues. But on the other hand, it could also put him at odds with Hogwarts' traditional ways. The teachers would be forced to re - evaluate their discipline methods, and Harry would have to deal with the fallout, which could include being ostracized by some or having to prove his point in a very difficult situation.
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.
Perhaps in the fanfiction, Snape assigns Harry to clean all the old potion vials in the storage room during detention. While doing so, Harry discovers an old diary that seems to hold secrets about Snape's past at Hogwarts, which then leads to a series of revelations and a change in their relationship.
A common scenario is that Harry is made to scrub cauldrons. Snape would be hovering nearby, making sarcastic remarks about Harry's sloppiness. Another one could be that Harry has to organize Snape's Potions ingredients in alphabetical order while Snape quizzes him on their properties.
Well, obviously Harry Potter and Severus Snape are the main characters. Harry is the protagonist we know from the original series, and Snape is the strict professor. Their interactions during detention are what the fanfiction is usually about.
One great fanfiction could be where Harry is given detention by Snape for accidentally knocking over a potion during class. In this fic, Snape makes Harry clean the entire potions classroom, including scrubbing the cauldrons. As Harry cleans, he discovers an old, hidden potion recipe that Snape had been looking for. This leads to an unexpected conversation between them and a bit of a truce.
Well, they might start by arguing at first in detention. Harry could be suspicious of Daphne, and Daphne might be a bit haughty towards Harry. But as time goes on, they could start to understand each other better. Maybe they discover they have some common interests like a love for a certain type of magic or a shared dislike for a particular teacher.