Maybe Snape uses an ancient magic spell he's discovered to heal Harry. This spell might have specific requirements or incantations.
It's possible that Snape offers Harry some rare magical artifact that has healing powers. But it might come with a catch or some conditions for its use.
In these fanfictions, Harry Potter could seek comfort from Snape in different ways. Sometimes it could be because Snape is the only one who seems to understand the weight of the prophecy on Harry's shoulders. Harry may feel that Snape, having been involved in the whole prophecy business from the start, can give him advice on how to deal with it. Snape's skills in magic, especially in potions and the dark arts, might also make Harry feel safer in his presence. So, in a way, it's a combination of shared secrets, knowledge, and a sense of protection that leads Harry to seek comfort from Snape.
In some fanfictions, Snape might use his advanced knowledge of potions to create a special concoction to heal Harry. He could draw on his skills in Herbology as well to find rare ingredients for the potion.
In the original 'Harry Potter' series, the relationship between Harry and Snape was one of mutual dislike but also a certain level of respect in the end. However, in this fanfiction, it's a complete break. The fanfiction might change the power dynamics at Hogwarts as well. Snape was a key figure in the school's hierarchy, and his death at Harry's hands would send shockwaves through the staff and students, unlike anything in the original story where his death was a heroic sacrifice.
Well, regular Harry Potter fanfiction can cover a wide range of relationships and storylines. But 'Harry Potter and Severus Snape yaoi fanfiction' specifically focuses on a romantic and often homoerotic relationship between Harry and Snape. It's a niche within the fanfiction world that caters to those interested in this particular pairing.
Harry could also outwit Snape by using his quick thinking and ability to improvise. Suppose there is a situation where Snape is trying to catch Harry doing something wrong. Harry might use the chaos around him, like a commotion caused by other students, to his advantage. He could blend in with the situation, making it seem like he's innocent while actually achieving his own goals, like getting access to a restricted area for a noble reason that Snape doesn't initially understand.
In this fanfiction, Harry might stand up to Snape's abuse by using his wits. He could expose Snape's unfair treatment in front of the other professors. For example, he might gather evidence of Snape's partiality in grading or his excessive use of punishments towards Gryffindors. By presenting this evidence to Dumbledore or other authority figures, Harry would be taking a stand against Snape's abuse.
It probably deviates in terms of character portrayal. In the original, Snape has a very complex and mostly antagonistic relationship with Harry. But this fanfiction with its 'daddy Snape' concept might make the relationship more personal or family - like in a very different way than the books or movies.
As the story progresses, they might start to work together more closely. Snape could be teaching Harry some advanced magic that no one else knows, and through this process, they build a bond. Harry begins to understand Snape's past better and realizes that they have more in common than he thought, like their love for Lily Potter in different ways.
In this kind of fanfiction, Harry often becomes more proficient in potions and other areas that Snape is good at. His relationship with Snape also makes him more empathetic towards Snape's past and the Slytherin house in general. He may not be as quick to judge people based on their house. Also, he might develop a more complex view of the wizarding world's politics, as Snape is deeply involved in some of the darker aspects of it.
Maybe Snape did something that went against Lily's expectations or values, and she uses the howler to express her disappointment. For instance, he might have joined a group she doesn't approve of.