A possible plotline is that while teaching Harry potions, Snape discovers a new potion ingredient or method through Harry's unorthodox thinking. This not only helps Harry in his studies but also gives Snape a new perspective on potion - making. Their relationship then evolves from one of animosity to a more collaborative and understanding one.
One interesting plotline could be Snape finally seeing Harry's potential in potions and secretly mentoring him outside of class. This could lead to a grudging respect between them.
Perhaps in the fanfic, Snape uses teaching Harry potions as a way to atone for past wrongs. He might share some of his own experiences with potions, which are both difficult and enlightening for Harry. As a result, Harry's skills in potions improve rapidly and he starts to understand Snape better.
Snape's character might develop by becoming more patient. Usually strict and harsh, teaching Harry could force him to be more patient and understanding, as Harry has a different learning style.
In some 'love potion' Harry Potter fanfics, the plot might revolve around a love potion being used as a weapon. Maybe a dark wizard or witch uses a powerful love potion to manipulate a group of students into doing their bidding. Harry and his friends would then have to find an antidote and stop the villain's plan. This could involve a lot of adventure, like sneaking into the potions classroom at Hogwarts to find the recipe for the antidote.
One interesting plotline could be Snape initially struggling with his new role as Harry's guardian. He's used to disliking Harry, but as he gets to know him better, he discovers Harry's hidden talents and insecurities. For example, Harry might show an aptitude for potions that Snape had never expected, and Snape has to learn to be a positive influence in Harry's life instead of a critical one.
One interesting plot could be that Snape, while teaching Harry, discovers a hidden talent in him for a very rare branch of magic. He then decides to secretly mentor Harry in that area, leading to a unique bond between them.
One possible plotline could be that it's all a misunderstanding. Maybe Snape was under the influence of a dark spell that made him act out of character and hit Harry. Then the story could revolve around Harry trying to find a way to reverse the spell and save Snape from further disgrace.
A possible plotline is that Snape's adoption of Harry causes a rift in the wizarding community. Some might support it, seeing it as a way to keep Harry safe and under the watchful eye of a powerful wizard. Others might oppose it, fearing that Snape's dark past could influence Harry negatively. This conflict could lead to many adventures and challenges for both Snape and Harry as they try to navigate through the political and social turmoil.
In this fanfiction, a great plotline could be Harry's rivalry with other potion - makers. There could be a big competition where Harry has to prove his skills against some really tough opponents. He might struggle at first but then discovers a new ingredient or method that gives him an edge. His growth as a potion master could also be linked to his personal growth, like learning patience and precision in making potions which then reflects in his relationships and decision - making skills.
A great plotline in such fanfiction could be a Potion Master being framed for creating a harmful potion. The real culprit might be someone trying to discredit the Potion Master for personal gain, like a rival for a teaching position at Hogwarts. The Potion Master then has to prove their innocence while also dealing with the chaos that the false accusation has caused in the wizarding community. They might have to enlist the help of their students or former colleagues to clear their name.
Another plotline is when they are sent back in time together. In these fanfics like 'Back to the Beginning', they have to navigate the past and deal with their past selves. It often leads to some self - discovery for both of them and a chance to rewrite some of their history.
Another plotline could be that Harry, in his teaching role, discovers a new and powerful form of defensive magic. He then has to decide whether to share it with the entire wizarding world or keep it within Hogwarts for the safety of his students. This could lead to a conflict with the Ministry of Magic, who may want to use the magic for their own purposes. Also, some students might be jealous of the attention Harry gives to certain students who show great potential in this new form of magic.