If Snape raised Harry, Harry would likely become a much more skilled potions master at an earlier age. Snape's knowledge and strict teaching methods would push Harry to excel in that area.
In the fanfiction, their relationship would be complex. Snape would constantly be reminded of Harry's father, but also grow to love Harry in his own way. Harry would be exposed to Snape's darker side as well as his hidden kindness. For example, Snape might show Harry some of the more dangerous and forbidden magic, but also teach him the importance of self - control and responsibility when using it.
One idea could be that Snape takes Harry in secretly. He teaches Harry advanced potions and magic in a more personal way, away from the prying eyes of Hogwarts. Harry begins to see Snape in a new light, not as the mean professor but as a strict yet caring guardian.
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.
Well, in such a fanfiction, Bill might teach Harry about the wizarding world from a different perspective. Maybe he'd introduce Harry to more about the magical creatures he's encountered during his work with Gringotts. He could also pass on some of the Weasley family's unique traditions and values, which would be a contrast to what Harry has experienced at the Dursleys.
Well, first of all, Harry would have to adjust to the new setting of Forks. He would be raising Teddy in a place very different from the wizarding world. Teddy might start to show some interesting magical abilities that would be quite a novelty in Forks. Harry would have to be careful not to expose magic too much, while still teaching Teddy about his heritage. And he would probably make some new friends in Forks who would be intrigued by his different ways.
It would be extremely complex. Harry might initially be in disbelief and struggle to accept Snape as his father. Snape, on the other hand, would probably be very strict but also deeply protective in his own way.
If Snape finds Harry Potter fanfiction, he'd probably be quite irritated. He has a rather stern and no - nonsense personality. He might see it as a frivolous waste of time and be disdainful of the creative liberties often taken in fanfiction. He'd likely scoff at the idea of people writing about his students and the wizarding world in such unregulated ways.
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 a possible fanfiction plot, perhaps Harry discovers a magical spell that allows him to 'ride' Snape in a sense of using Snape's magic or knowledge for a quest. Maybe it's a situation where Snape is under a spell himself and Harry has to control him like a steed to reach a hidden place in Hogwarts to find a powerful artifact that can save the wizarding world.
The relationship would start off rocky. Snape would be resistant to Harry's kindness as he has always seen Harry as James Potter's son. But Harry's persistent efforts to understand and help Snape would gradually break down Snape's walls.