One possible scenario could be in a potions class. Snape might be unfairly criticizing Harry's work as usual, but this time Harry decides he's had enough. He stands up, looks Snape in the eye, and calmly but firmly defends his potion - making process, explaining how he followed the instructions correctly. This could shock Snape into silence for a moment.
In a situation where Snape is unjustly deducting points from Gryffindor. Harry stands up and challenges Snape's decision. He lists out the reasons why the deduction is unfair, like how it was actually a Slytherin who started the trouble but Snape is only punishing Gryffindor. Harry's boldness could lead to other students also speaking up against Snape's bias.
Maybe during a Hogwarts corridor encounter. Snape makes a snide comment about Harry's father. Harry, instead of just clenching his fists and walking away like he usually does, stands his ground. He tells Snape that he is not his father and that he should be judged on his own merits, not his family's past. This might make Snape see Harry in a slightly different light.
One scenario could be in the Hogwarts corridors. Maybe some Slytherins are taunting Harry about being a half - blood. In the fanfiction, Harry decides he's had enough. He stands up straight, looks them in the eye, and firmly tells them that his blood status doesn't define him. He uses his skills in magic, like a well - executed non - verbal spell, to show he's not to be trifled with.
In these fanfictions, Harry's character often shows great growth. Standing up to Snape means he's overcoming his fear and asserting himself. It could be a sign of his maturing confidence, no longer being intimidated by Snape's harsh exterior. This also might lead to a different dynamic in their relationship, perhaps towards mutual respect as Snape may start to see Harry in a new light.
At first, it would likely strain their relationship even more. Snape is used to having the upper hand and Harry's defiance would anger him. But in the long run, it could lead to a grudging respect from Snape. He might start to see Harry as more than just James Potter's son and realize that Harry has his own strength of character.
One common plotline is that Harry stands up to Snape over unfair treatment of his friends, like Hermione or Ron. Another could be about standing up for the rights of all students against Snape's sometimes harsh disciplinary actions. There might also be a plotline where Harry stands up in defense of his own magical abilities when Snape doubts him.
In such a fanfiction, perhaps Harry discovers some dark secret of Snape's that makes him decide to take action against him. Maybe Snape has been plotting something truly evil all along, and Harry finally uncovers it and has to destroy Snape to protect Hogwarts and his friends.
Perhaps in this fanfiction, Harry submits to Snape in order to gain access to some important information. Snape might be in possession of secrets about Harry's family or his own powers that he refuses to share unless Harry shows complete obedience. So, Harry decides to submit to Snape's demands in order to uncover these mysteries that are crucial for his journey as a wizard.
One scenario could be that a jealous classmate uses a darkish but not too harmful spell to plug up Harry's connection to his magic during class. This is done out of envy for all the attention Harry usually gets. Harry then has to figure out how to overcome this with the help of his friends, like Hermione might research in the library while Ron tries to distract the teacher from noticing Harry's predicament.
One key moment could be in the potions class. Snape might be unfairly criticizing Hermione's potion - making skills, and she just refuses to take it silently and stands up to him, stating her case clearly. Another moment might be when Snape is being overly harsh on one of her friends, and Hermione steps in, protecting her friend and facing Snape's wrath head - on.
It could be a situation where Harry has been wrongly accused. Some overzealous magical law enforcers chain him up and confiscate his glasses as a form of punishment before a proper trial. This would create a lot of internal conflict within Harry, feeling betrayed by the very system he has been fighting for.
Well, perhaps there was an emergency at Hogwarts. Maybe some dark forces were approaching, and Snape, being a powerful wizard and a Hogwarts professor, felt it was his responsibility to pick Harry up. Harry was always a target for the dark side. Also, it could be that Snape had some new information about Harry's family or his destiny that made him decide to take Harry under his wing, so to speak, by picking him up.