Many stories have Snape's past with Harry's mother as a backdrop to his crush. The plot might involve Snape seeing Harry as a combination of Lily and his own ideal. There could also be a plotline where Snape tries to distance himself from Harry to avoid these feelings, but is constantly drawn back.
A common plotline is the 'forbidden love' aspect. Since Draco is from a Slytherin pure - blood family and Harry is a Gryffindor, their relationship is not expected or approved. Another plotline could be Draco trying to protect Fem Harry from some dark force, which makes him realize his deep feelings for her. It could also involve Fem Harry initially hating Draco because of his past behavior, but as she discovers his true feelings, she starts to see him in a new light.
Often, the plotlines involve Fleur helping Harry in some way, like during a dangerous situation. Maybe it's a battle where she uses her skills as a Triwizard champion to protect Harry, and through that shared experience, her crush deepens. There are also fanfics where Fleur has to hide her feelings because of her family's expectations or because she's worried about Harry not reciprocating. This leads to some angsty moments where she's torn between her feelings and what she thinks she should do.
One possible plot could be that Harry starts to notice Snape's hidden kindnesses towards him. Maybe he begins to see past Snape's cold exterior during potions class or in their interactions in the hallways. This newfound perspective makes Harry develop a crush. As he tries to get closer to Snape, it causes chaos and confusion among the other characters at Hogwarts.
There is. In many of these fanfictions, the authors take creative liberties. They might have Snape secretly protecting Harry not just because of his mother Lily, but also because of his own feelings. They also might show how Harry could potentially respond if he were to find out, which could range from shock to confusion to something more positive.
There are definitely some. Look for tags related to 'Harry has a crush on Snape' on fanfiction platforms. However, it's a rather unconventional pairing, so the number of fics might not be as large as more common pairings. But the ones that exist can offer a fresh take on the Harry Potter universe and the characters' relationships.
One common theme is the struggle of Hermione with her feelings. She's a logical person, so having a crush on someone like Snape, who she might not fully understand at first, can be a source of internal conflict. Another theme could be the secrecy of her crush, as it's not a typical relationship in the 'Harry Potter' world.
Another plotline could involve Cho gradually noticing Harry's feelings and starting to develop her own feelings in return. There might be some misunderstandings along the way that they have to overcome, like when Cho misinterprets Harry's actions or words.
Often, you'll see plotlines where Snape's desires are tied to his need for redemption. He may see Harry as a way to atone for his past mistakes. Some fanfictions also explore a more emotional connection between them, like Snape becoming a father - figure to Harry in a way. This can involve Snape teaching Harry more about the wizarding world from his own unique perspective. There are also plotlines where Snape and Harry work together to uncover secrets about Harry's past or Hogwarts itself.
One common plotline is that Snape becomes a sort of secret mentor to Harry. He imparts his knowledge of the Dark Arts and Defense Against the Dark Arts in a way that the official Hogwarts curriculum doesn't cover.
One common plotline is that Harry stands up to Snape over unfair treatment of his friends, like Hermione or Ron. Another could be about standing up for the rights of all students against Snape's sometimes harsh disciplinary actions. There might also be a plotline where Harry stands up in defense of his own magical abilities when Snape doubts him.