Recommend some Severus Snape and Sirius Black slash fanfiction.

The exploration of their shared past is also a big theme. Since they were at Hogwarts together, fanfictions often go back to their school days to show how their relationship could have been different. And there's the theme of the power of love and friendship in unexpected places. Despite their initial hatred, they find a connection that goes beyond what they thought possible. It shows that love and friendship can bloom even in the most unlikely situations.

There are also fanfictions where they are magically bonded in some way. This bond makes them feel each other's emotions and forces them to deal with their relationship on a much deeper level. They have to learn to tolerate and eventually accept each other, which leads to a very different kind of relationship compared to what we saw in the original Harry Potter books.

There are fanfictions where they are forced to team up in a situation outside of Hogwarts. This could be in a post - Voldemort world where they have to deal with the remnants of the Death Eaters. In these stories, they slowly start to understand each other's motives and personalities, leading to a new - found respect and sometimes more than that. It's really interesting to see how different authors play with their characters.

One popular piece of fanfiction in this category is 'Shadows of the Past'. It delves deep into the complex relationship between Snape and Sirius. The author does a great job of exploring their characters and how they might interact in a different, more intimate context. Another one is 'Unlikely Bonds' which shows their journey from animosity to something more.

In fanfiction, Sirius Black and Severus Snape often have complex relationships. Sometimes they are portrayed as rivals, with their past grudges from Hogwarts days still lingering. Their different loyalties, Sirius to James and the Order, and Snape to Dumbledore (while being a former Death Eater), add layers of tension.

Most official 'Harry Potter' - related platforms and communities do not encourage or support mpreg fanfiction as it goes against the established lore in many ways. It's better to focus on more traditional fanfiction themes that are more in line with the essence of the story, such as friendship, adventure, and magic within the wizarding world.

In the fanfiction 'Shadowed Hearts', the relationship between Snape and Sirius is depicted in a very unique light. It delves deep into their past traumas and how those shape their interactions. The story is filled with tension and slow - burning passion as they gradually come to understand and care for each other more than they ever thought possible.

Love triangles are also somewhat common in Severus Snape and Sirius Black fanfiction. Sometimes it involves a love interest from the original series, like Lily Evans, and how their feelings for her, both past and present, impact their relationship with each other. It can add a whole new layer of drama and complexity to the story.

I really like 'A Different Perspective'. In this fanfic, it's set post - war. Sirius, who survived the Battle of Hogwarts, and Severus, who has been pardoned, find themselves living in the same wizarding community. The story focuses on how they both have to deal with their past traumas and how they start to interact with each other. They start off avoiding each other but are gradually drawn together by their shared experiences and the realization that they are not so different after all.

They are an interesting pairing because they are such opposites. Snape is brooding and often seen as the outcast, while Sirius is more bold and carefree. In fanfiction, it's fascinating to see how these two very different personalities could come together.