At first, Severus would probably be very suspicious of Harry. After all, Harry is an unknown figure suddenly appearing. But Harry, being the friendly person he is, would try to break the ice. He might start by complimenting Severus on his potion - making skills, which Severus is already quite good at even as a young boy. Their interaction would be a bit tense initially, but as they start to understand each other more, they could become friends or at least allies.
One great fanfic is 'The Prince's Tale Continued'. It delves deeper into Snape's life after the events of the original series. It shows his struggle to come to terms with his past and his role in the wizarding world. Another good one is 'Snape's Redemption'. This fanfic focuses on how Snape tries to make amends for his past actions towards Harry and the others. It gives a more in - depth look at his complex character.
In such a fanfiction, Harry might see the potential in young Severus that others overlooked. He could protect Severus from the bullies at Hogwarts. Harry, having experienced his own share of hardships, would understand Severus's situation to some extent and try to give him a better childhood, perhaps even guiding him to use his magic in a more positive way.
A lot of fanfic writers will create unique storylines for Snape's courtship. They might introduce an original character who manages to break through Snape's tough exterior. His courtship would then involve him struggling with his own insecurities and his reputation. This character might see the good in him that others overlook. There could be moments of tension and misunderstanding, but also deep, meaningful conversations as they get to know each other better.
Often in fanfiction, the ring can be a plot device. It could be that Harry Potter unknowingly has a connection to the ring, and Severus Snape has to keep it from falling into the wrong hands. This creates a situation where Snape has to protect both Harry and the ring, leading to some tense and interesting storylines.
In some fanfictions, Snape might share some of his knowledge about the wizarding world's secrets with Harry. Maybe he tells Harry about certain spells or magical artifacts that could help Harry in his fight against Voldemort. This act of sharing knowledge is a way of being nice as it gives Harry an advantage in his battles.
Severus could become more confident. With Harry's support, he may not be as shy or withdrawn as in the original story. He might be more open to making friends outside of Slytherin.
One possible plot could be that Harry, through some time - traveling magic, meets young Severus. Harry, knowing Severus' future, tries to befriend him and change his path. He could introduce Severus to different ways of using magic that are less dark - oriented, which might change Severus' perception of magic and his future relationships in Hogwarts.
One great fanfiction is 'The Prince's Tale Reimagined'. It delves deeper into Snape's relationship with Harry from Snape's perspective. Another good one is 'Snape's Redemption Arc'. It shows how Snape's actions throughout the series can be seen in a different light, with a focus on his complex relationship with Harry. And 'A Different Kind of Magic' is also a wonderful read. It creates an alternate universe where Snape and Harry have to work together more closely from an earlier point in the story.
One appeal is the novelty. It's not something you'd expect in the normal Harry Potter world, so it grabs attention. Fans like to see familiar characters in new and unexpected situations.