Sirius could help Harry cope by sharing his own experiences of being an outcast in his family. He could tell Harry that just because his parents did this horrible thing, it doesn't mean he's unlovable. Sirius could also introduce Harry to his friends in the wizarding world, like Remus, who could also offer support and friendship.
A plotline could be that Harry, after being dumped by his parents, has a very different personality. He's more withdrawn and distrustful. Sirius has to work hard to break through those walls. They could travel to different magical places to find a way to reverse what Harry's parents did or to find out the real reason behind it. Along the way, they meet other characters who either help or hinder their journey, and this all shapes their relationship and Harry's growth as a person.
In many fanfictions where Sirius meets Remus' parents, it can be a very interesting scenario. It might be filled with tension as Sirius is often seen as a bit of a rebel. Maybe at first, Remus' parents are cautious of Sirius, given his family's reputation. But as they get to know him, they could see his true self and how much he cares for Remus.
A very loving and exciting one. James and Sirius were both full of life. They would likely fill Harry's childhood with adventures and magic lessons. There would be a lot of laughter and pranks around the house.
One reason could be Harry's impulsiveness. Harry often jumps into dangerous situations without thinking, and Sirius, being his godfather and having a protective nature, would shout at him to make him realize the risks. For instance, if Harry decides to go after a Death Eater alone.
Well, it completely flips the story on its head. In the original, James was Harry's father and Sirius was his godfather. But if they are both his parents in fanfiction, it means a different family structure. Harry might grow up with a more united front of his two dads, perhaps having a different set of values instilled in him. Also, the relationship with the wizarding world might be different as they both have their own connections and reputations within it.
One great fanfiction about Sirius Black's parents could be 'The Noble House of Black'. It delves deep into their family history, exploring their pure - blood heritage and the expectations placed on them. It shows how their family's traditions and values influenced Sirius as well.
Perhaps Sirius will be overawed by Remus' parents' love for their son. He might compare it to his own family situation and feel a bit envious. On the other hand, Remus' parents might see Sirius as a broken soul in need of love and acceptance. This could lead to a very heart - warming relationship where they take Sirius under their wing and help him become a better person while also fully accepting his relationship with Remus.
It's possible that in the cave, they start to see each other as equals rather than just a mentor - student relationship. They might argue about the best way to deal with the cave's mysteries at first, but through that process, they learn to value each other's perspectives. Also, if one of them gets injured in the cave, the care and concern shown by the other would enhance their relationship.
Yes, there might be such fanfictions out there. Fanfiction writers often come up with creative and sometimes out - of - the - box ideas. They might explore the idea of Harry having a different relationship to Sirius in an alternate universe where he could be seen as Sirius's daughter. However, it's not a common or traditional take on the Harry Potter universe.