One place to start looking could be on fanfiction platforms like Archive of Our Own (AO3). Just use the search function and type in 'Snape comforts abused Harry Potter'. There are often filters you can use to further refine your search, like by rating, word count, etc.
Another way Snape could comfort Harry is by standing up for him in certain situations. Maybe when other teachers or students are being unfair to Harry, Snape steps in and defends him. This act of protection can be a great source of comfort for Harry, as it shows that someone is on his side even if they have had a rocky relationship in the past.
The theme of forgiveness also often appears. Harry, having known Snape's past actions that were not always in his favor, has to come to terms with forgiving Snape in order to accept his comfort. And Snape, in turn, has to forgive himself for his past misdeeds. Another theme could be the power of connection. Despite their differences, they find a connection through shared pain or a common goal, and this connection is what allows Snape to comfort Harry.
The relationship can be developed by having Snape protect Harry in unexpected ways. Maybe in a fanfic, there's a plot where some dark wizards are after Harry. Snape, secretly, uses his skills to keep Harry safe. Later, when Harry discovers this, Snape has to explain his actions. This explanation can be a turning point where they start to trust each other more. Snape can then start to offer words of comfort based on his understanding of Harry's situation. They could also start to work together on some small tasks, like researching a new potion that might help Harry in his fight against the dark side, which further cements their relationship.
One common theme is redemption. Even though Snape is abused, the story might lead to a path where he finds some form of redemption or peace. Another theme could be power struggle. With Snape being in a position of power at Hogwarts but also being a victim of abuse, the power dynamics are often explored.
Yes, there are some. You can start by looking on fanfiction platforms like Archive of Our Own. There you might find stories that explore the concept of Snape being abused in the context of the Harry Potter universe. However, the quality can vary widely, so it might take some time to sift through and find ones that really capture your interest.
There's a fanfic titled 'Snape's Redemption in Harry's Abuse'. This story focuses on how Snape, who has his own complex past with Harry's father, realizes that Harry is a victim of constant abuse. He decides to use his position as a teacher and his skills in potions and magic to keep Harry safe. It delves deep into the relationship between Snape and Harry, exploring themes of forgiveness and second chances.
Snape's reaction could be quite mixed. On one hand, he might be angry at Dumbledore for not doing more if he knew about the abuse. He may also feel a strange sort of empathy towards Harry. After all, Snape himself had a difficult childhood. So, he could start to be a bit more lenient with Harry in his classes and try to subtly offer support.
A great fanfic could involve Harry being bullied by some Slytherins and Snape steps in. He takes Harry to his office and instead of scolding him, he offers him a cup of tea. Snape then tells Harry about how he himself had to deal with difficult situations at Hogwarts when he was young. By opening up like this, Snape comforts Harry and makes him realize that everyone has their own battles. Harry leaves the office feeling more confident and less alone.
In some versions, Snape might notice Harry's withdrawn behavior or signs of physical harm during Potions class. Maybe Harry flinches when someone gets too close, which makes Snape suspect something is wrong.