Another way could be that Harry uses his skills in magic to play pranks on Snape. He might use a spell to make Snape's potions backfire during a class demonstration. Since Snape is so proud of his potions skills, this would be a huge embarrassment for him.
In some fanfictions, Harry might expose Snape's past wrongdoings to the whole school. For example, if Snape had been unfair in grading or showing favoritism to certain students, Harry could find evidence and make it public. This would damage Snape's reputation among the students and teachers.
In some versions, Snape might use his knowledge of the Dark Arts to expose the wrongdoings of those who have wronged Harry. For example, if there are Death Eaters or bullies in Hogwarts who target Harry, Snape could reveal their secret plans or actions that are against the school rules or the wizarding law.
One creative way could be that Harry, with the help of Hermione's research skills, discovers a long - forgotten magical law or rule that Snape has unknowingly violated. Then Harry could report this to the proper authorities in Hogwarts, like the Headmaster or the Board of Governors. This would lead to Snape facing some sort of disciplinary action.
The Death Eaters who have caused harm to Harry's family and friends are also probable targets. Snape, having been a double - agent among the Death Eaters, could help Harry take revenge on those who have killed his parents or endangered his loved ones. He could provide crucial information about their whereabouts or weaknesses.
Harry might start by making a list of all the wrongs Snape has done to him over the years. This would include things like unfair grading, public humiliation, and general nastiness. Then, he could look for ways to expose these actions to the rest of the wizarding world. Maybe he would use the wizarding newspapers or even start his own blog (if there were such a thing in the wizarding world) to share his experiences. He could also try to find allies among the students and faculty who have also had problems with Snape.
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.
In some fanfictions, Snape might use his advanced knowledge of potions to brew a special healing elixir for Harry. He could also use his magic skills, like a complex spell specifically designed to mend Harry's wounds, whether they are physical or emotional.
Snape could initially be skeptical. Given their long - standing enmity, he might not believe that Harry's apology is sincere at first. He might respond with a cold glare or a sarcastic comment, like 'Potter, your apologies are as empty as your head.'
Snape could also use his magical abilities in a more emotional sense. He might share his own past traumas with Harry, creating a bond of understanding that starts to heal Harry's broken spirit. By being vulnerable himself, he shows Harry that it's possible to move past pain.
Snape may embarrass Harry by singling him out during dueling practice. He could point out Harry's mistakes harshly and in a condescending way. For example, he might say that Harry's spellcasting is amateurish compared to his father's, which hits a nerve with Harry and makes him feel embarrassed and angry at the same time.
Sookie might get revenge on Bill in a variety of ways depending on the fanfiction. It could be through some elaborate scheme or a sudden confrontation.