In this fan fiction, Harry might save Severus through some form of unique bond. It could be an emotional bond where Harry realizes Severus's hidden goodness or a magical bond that gives him the power to rescue Severus from a dangerous situation, like a dark spell or a life - threatening attack from Voldemort's side.
In this fan fiction, Harry's development is likely to be quite different from the original series. He may start to question the black - and - white view of good and evil he had before. With Snape's intervention in his life, he might see the complexity of people more clearly. At Bloor's, he'll be exposed to a diverse range of characters and situations. This will force him to grow up faster and become more adaptable. He may also develop a more in - depth understanding of magic as Bloor's might have different magical traditions than Hogwarts, and he'll have to learn and adapt to them.
Obviously, Severus Snape and Harry Potter are the main characters. Severus is the one doing the saving, and Harry is the one being saved from the Dursleys. But there could also be other characters involved. For example, Dumbledore might make an appearance. He could either support Severus's actions or be a bit wary of them. Petunia Dursley could also be a significant character as she is part of the reason Harry needs to be saved from that household.
The theme of sacrifice is also prevalent. Remus might have to sacrifice his own safety, or even his reputation in some fictions, to save Harry. And there's often the theme of the underdog rising. Harry, who has faced so many challenges, is saved by Remus, showing that even in difficult situations, there's always hope for rescue.
In the 'george saves harry from lake fan fiction', it could be that there was a task or an accident that led Harry to be in the lake. George, who is likely Harry's friend or ally, senses the danger. He overcomes whatever obstacles are in his way, like the depth of the water or other threats, and reaches Harry just in time to save him. It could also show the bond between George and Harry and how far George is willing to go to protect Harry.
One common theme is redemption. Snape's actions to save Harry are often seen as a way for him to atone for his past mistakes or his association with the Death Eaters. It gives him a chance to be a hero in his own right.
In this fan fiction, Snape could save Harry from Voldemort's followers who are after him. The blood adoption might be a way to give Harry a new family connection. Snape, having complex feelings for Harry's mother, might see this as a way to fulfill a promise or a way to atone for past actions. He could then teach Harry some of his more advanced potions knowledge and help him develop his occlumency skills better.
In these fan fictions, a theme of transformation is quite common. Lucius might transform from his traditional, perhaps cold and calculating self, into someone more caring and empathetic due to his relationship with Harry. Harry, too, may transform from a victim of abuse to someone who is more confident and in control of his life. The contrast between their initial states and how they change as a result of their relationship can be a central aspect of the story.
Maybe Severus discovers some dark magic plot that involves the Dursleys harming Harry in a more serious way. So, he intervenes just in time. He could use his skills in potions and magic to subdue the Dursleys if they resist, and then take Harry to a safe place, like his own secret hideout or a friendly wizard's home.