One possible story could be one where Snape slaps Hermione in a moment of extreme frustration during a potions class when she makes a big mistake that endangers the whole class. However, this act then leads to a series of events where they both have to work together to make amends and understand each other better.
Often, it starts with the slapping incident which creates immediate conflict. Then, Hermione might be outraged and seek justice or revenge, which drives the plot forward. For example, she could go to Dumbledore about it.
One possible story could be about Snape losing his temper after Harry makes a big mistake in potions class and slaps him. Then it might explore Harry's shock and anger, leading to a tense relationship between them that has to be mended over time.
Sometimes it's to show a conflict in their relationship. Ron and Hermione have a complex relationship, and a slap can symbolize a breaking point in their interactions.
One popular one might be 'The Moment of Impact' where the slap is a turning point in their relationship. It delves into the emotions and misunderstandings that led to that moment.
One great Snape and Hermione fanfiction is 'The Unbreakable Bond'. In this story, Hermione discovers a hidden side of Snape during her research in the Hogwarts library. Their relationship starts as a mentorship but gradually evolves into a deep friendship that defies the expectations of the wizarding world. It beautifully portrays their individual characters and how they can complement each other.
The 'time - travel' trope is also quite common. For example, Hermione might go back in time and interact with a younger Snape, which can lead to all sorts of new storylines and character developments.
Hermione might become more guarded at first. She is used to being independent and suddenly being 'gifted' to Snape is a big change. But over time, she could learn to be more patient and understanding. Snape, on the other hand, might soften a bit. His usual cold exterior could crack as he gets to know Hermione better.
It's hard to say who would be the clear winner. Hermione is intelligent and quick - witted, but Snape has years of experience and a great deal of magical knowledge. If it's a battle of words, Hermione might hold her own for a while, but Snape could use his authority to shut her down.
She might give him cold stares in class. Hermione is not one to shy away from showing her emotions through her expressions. So, every time Snape is in her line of sight, she could fix him with a withering glare that clearly shows her displeasure.