A great plotline could be Snape training Draco in advanced potions and magic that are not part of the regular Hogwarts curriculum. This could lead to Draco having unique skills that help him in the wizarding world. Also, Snape might take Draco on secret excursions to learn about the history of the Dark Arts in a way that doesn't lead him down a dark path but rather makes him understand the dangers better.
There could be a plot where Snape discovers Draco has a talent for something unexpected, like healing magic. Snape then encourages Draco to pursue this, which goes against the expectations of the Malfoy family. This causes a rift between Draco and his family at first, but with Snape's guidance, Draco learns to balance his newfound passion with his family obligations.
One unique plotline is when Snape has to train both Draco and Harry in a special form of magic that was lost for centuries. This brings out a whole new side of their relationships as they have to rely on each other to master the magic. It's different from the usual Hogwarts drama we see in the books.
Some fanfics have a plotline where Draco becomes a double agent, and Snape has to protect him while also dealing with Harry's suspicions. It creates a really tense and interesting dynamic between the three.
One interesting Snape and Draco fanfiction is 'The Mentor and the Student'. In this story, Snape takes Draco under his wing in a more in - depth way than in the original books. It shows their complex relationship evolving as Draco struggles with his family's expectations and Snape tries to guide him towards a different path.
A great plotline is when fanfiction delves into how Snape's relationship with Lily affects his interactions with the Marauders. Since he loves Lily and she is friends with the Marauders, it creates a complex dynamic. In some fics, Snape might try to protect Lily from the potential harm that could come from the Marauders' more dangerous pranks.
A common plotline is an alternate universe where Snape is not as bitter and Hermione befriends him more easily. They could be involved in a battle against a new dark force, and their combined intelligence and magic powers are crucial for victory. Also, there could be a plot where Hermione accidentally enters Snape's mind through some experimental magic and discovers his deepest secrets, which then changes their relationship.
Another interesting plot is when they are both part of a magical competition. They start as rivals but end up learning from each other. In one particular fanfiction, they are in a dueling tournament. Through the duels and the preparation for them, they see each other in a new light and form an unexpected bond.
There might be a fanfiction where Snape discovers a young Draco has a unique magical ability that he decides to secretly train. This could lead to a series of adventures where they have to hide this from Lucius and other Death Eaters. It could explore Snape's conflicted feelings as he tries to protect Draco while also being in a difficult position within the Death Eater ranks.
A really cool fanfiction could be set in an alternate universe where Harry, Snape, and Draco are all part of a secret society in Hogwarts. They have to keep the society's existence and purpose a secret while dealing with their own personal issues and rivalries within the group.
Well, a popular plotline is the redemption of Snape through his relationship with Harry. In these fanfictions, Harry gradually discovers the sacrifices Snape has made for him and the wizarding world. This leads to a new - found understanding and even a form of friendship between them. There are also fanfictions that explore what would happen if Snape adopted Harry, which is a very different take on their relationship.
Well, a common plotline is that Snape is initially reluctant to be around baby Harry due to his hatred for James. But as he spends time with the baby, he starts to see Lily in Harry. He might start to protect Harry not just for Lily's sake, but also because he begins to care for the child himself. Some fanfictions also explore how Snape's interactions with baby Harry might change the future events in the wizarding world, like how it could affect Harry's relationship with Snape when he grows up.