One possible reason could be that Snape fails to deliver crucial information. Voldemort is a very demanding and unforgiving master. If Snape doesn't give him accurate details about the Order of the Phoenix's plans, for example, Voldemort would surely be enraged and punish him.
Another reason could be related to Snape's past associations. If Voldemort discovers some old connections that Snape has which he doesn't like or which he thinks might pose a threat to his own power, he would likely punish Snape. For instance, if there are some lingering ties to certain wizards or witches that Voldemort views as enemies, he would take it out on Snape.
Maybe Snape shows a sign of disloyalty, even if it's just a misunderstanding. Voldemort is paranoid and constantly suspects his followers. If he misinterprets one of Snape's actions as being against him, he would not hesitate to punish Snape. In the world of fanfiction, there could be many scenarios where Snape's actions or inactions are misconstrued by Voldemort.
Another reason might be that Harry is suspected of sneaking around in areas where he's not supposed to be. Snape, as a vigilant teacher, may punish Harry to maintain discipline in the school. He may think Harry is up to something related to the ongoing dangerous situations in the wizarding world and wants to keep him in line.
In some fanfics, Snape might punish Harry because of his perceived insolence in class. Harry has a rebellious streak, and Snape, being strict, wouldn't tolerate any behavior that he deems disrespectful to his authority as a teacher.
Snape might endure the punishment in stoic silence. He is a complex character and often used to hiding his true emotions. So, he could just grit his teeth and bear it, all the while plotting his revenge or a way to get out of the situation.
In some fanfictions, Snape might be working with Voldemort because he has been blackmailed. Voldemort could have found out some deep, dark secret about Snape and is forcing him to cooperate. This could be related to Snape's past or something he has done that he doesn't want to be made public.
In fanfiction, the author might want to explore Snape's past more deeply. Maybe there are events in his life that could have made him truly side with Voldemort. For example, if he had been more influenced by the dark arts from a younger age or had different relationships with other dark wizards that pushed him towards Voldemort. Also, it could be a way to show how different choices could have changed the whole 'Harry Potter' story.
In fanfiction, Snape's relationship with Voldemort is often complex. Snape was a double - agent, so on the surface he seemed to be loyal to Voldemort. But in fact, he was working for Dumbledore. This creates a lot of tension in their relationship in fanfictions. Some fanfictions might explore how Snape managed to deceive Voldemort for so long, and the psychological stress he endured while being in such a precarious position.
In fanfiction, Snape's relationship with Voldemort is full of mystery. Snape was a Death Eater, yet he was also Dumbledore's man. His relationship with Voldemort was based on lies and deception from Snape's side. This makes for great story - telling in fanfiction. Writers can explore how Snape walked the thin line between loyalty to Voldemort (as far as Voldemort knew) and his true mission for Dumbledore.
Yes, there are some fanfictions with such out - of - the - box concepts in the Harry Potter fanfiction community. However, these are not in line with the original story's canon.
Harry Potter often features prominently. His relationship with Snape is complex in the original series, and in fanfiction involving Snape and Voldemort, his role can be further explored. For example, how he reacts to Snape's interactions with Voldemort and whether he can figure out Snape's true motives sooner.
In fanfiction, Snape might punish Draco for getting involved with the wrong crowd. For example, if Draco starts to associate with Death Eaters - in - training or those with malicious intentions. Also, if Draco fails to complete his academic tasks or cheats in exams, Snape would surely take action. This is because Snape values knowledge and academic integrity in Hogwarts. Additionally, if Draco causes trouble during important school events or ceremonies, Snape would likely punish him to set an example for other students.