Maybe he's being bullied by Snape. Snape has always been tough on Harry in potions class. His harsh words and unfair treatment could easily make Harry feel frustrated and cry.
The grading system in this fanfiction's potions class could be different. Instead of the usual strict letter grades, it could be more focused on improvement and creativity. So, a student who comes up with an innovative way to make a potion, even if it doesn't turn out perfectly, could still get a high mark. Also, group projects could be a major part of the class, promoting teamwork among the students which was not always emphasized in the original potions class.
One interesting scenario could be a new student who has an unexpected natural talent for potions, much to Snape's surprise. This student might be able to create complex potions with ease, while others struggle.
For Harry, a different potions class might make him more interested in the subject. Since he often had a tough time with Snape, a new teacher or teaching style could make him see potions in a new light. He might start to enjoy the process of making potions and even excel at it. Hermione, on the other hand, would probably adapt quickly to any changes. She might use the new opportunities in the class, like new potions to study, to expand her knowledge even further.
Hermione Granger is often a central character. Since she is known for her academic excellence, she would be shown as the star pupil in potions class, acing every potion and helping others when they are in trouble.
Hermione would most likely be the first to help. She's always been there for Harry and is very knowledgeable in potions. She might quickly assess the situation and try to find a counter - potion or spell to revive him.
Perhaps he was extremely tired or stressed. Harry has a lot on his plate, with Voldemort constantly being a threat and all the schoolwork and Quidditch. He might not have had enough sleep or rest, and the potions class was just the tipping point where his body gave out.
Maybe Harry has had some secret interactions with Snape that the readers haven't known about yet. These interactions could have made Harry feel a father - like connection to Snape, and in the heat of the moment in potions class, he just blurts it out.
Sure. There's a fanfiction where the main character is a potions genius who uses their skills to help Harry and his friends in unexpected ways. This character might be able to brew potions faster or create more powerful versions of existing potions. It adds an interesting twist to the familiar Harry Potter world and makes for an exciting read.
One way sexual tension shows up in such fanfiction is through the power dynamics in the potions setting. A powerful wizard or witch might use their knowledge of potions to gain an upper hand in a relationship, creating a push - pull dynamic. In a story where Snape is a central figure, his brooding presence and his expertise in potions could lead to a charged atmosphere when he interacts with a student or another character. This can be both intimidating and alluring, adding to the sexual tension.