Sirius and Harry had a kinship. He regarded Harry as his own family, and his love for Harry was based on family feelings and the deep feelings of missing Harry's parents. He longed to live with Harry and give him the warmth of a family. Snape's feelings for Harry were even more complicated. He loved Harry's mother, Lily, and his love for Lily extended to protect Harry. Although he appeared to be strict and even harsh to Harry, he had always been secretly protecting Harry. This was a responsibility and protection that stemmed from his deep affection for Lily. It was difficult to simply compare Sirius's love for Harry with Snape's. Their love for Harry had different origins and manifestations. Sirius's love was more of a direct familial concern, while Snape's love was hidden under the stern appearance, and more of a guardian derived from his persistent love for Lily. Harry Potter and the Order of the Phoenix is not enough. Please click to read the novel!
The 'Harry Potter' series is a family - friendly and widely loved story. Snape and Sirius have their own complex relationships within the plot, which are centered around things like loyalty to different sides, their history with Harry's parents, and the fight against Voldemort. There is no place for inappropriate content like that in the official story.
Snape might be secretly pleased at first, seeing as he has no love for Sirius. But then, being a teacher, he'd probably feel obliged to report it. He also might use this situation to his advantage against Sirius in the wizarding politics within Hogwarts.
In the 'Harry Potter' series, Snape and Sirius Black are adversaries. Their relationship is rooted in their school days. James Potter was Sirius's best friend, and they both harassed Snape during their Hogwarts years. Later, Snape's allegiance to Dumbledore and Sirius's membership in the Order of the Phoenix didn't ease the tension. They were constantly at odds, with Snape often seeing Sirius as a threat to Harry, and Sirius having little respect for Snape due to their past.
Snape and Sirius' relationship is one filled with animosity and mistrust. Snape resented Sirius for his role in the bullying he endured at Hogwarts. Sirius, on the other hand, saw Snape as a former Death Eater and a potential threat. Their relationship is also influenced by their different loyalties. Snape is loyal to Dumbledore and his own mission to bring down Voldemort, while Sirius is loyal to the Order and to protecting Harry. Their interactions are often tense and full of underlying hostilities.
In some fanfics, Snape might help by using his knowledge of the situation. He could provide crucial information that clears Harry's name. Maybe he has some insights into Sirius' situation or the events that led to Remus blaming Harry that others don't have, and he decides to share that information to set things right.
I haven't come across a 'snape is sirius slave' fanfiction myself. Fanfiction themes can be very diverse, but this one seems rather unorthodox and might not be as common. However, the world of fanfiction is vast, and new works are being created all the time, so it's possible that someone has written it, but it may be difficult to find.
In some fanfictions, Sirius might be portrayed as delusional about Snape due to their long - standing enmity in the original story. Sirius has always suspected Snape of being a Death Eater, and this suspicion could be exaggerated in fanfiction, making him seem delusional.
One common theme is redemption. Many fanfics explore the idea of Snape or Sirius finding a way to redeem themselves in the eyes of the other. For example, Snape might do something heroic to earn Sirius' respect.
Yes, there are some out there. You can start by looking on fanfiction websites like Archive of Our Own. Just search for the tags related to Snape being Sirius' master and you might find some interesting stories.
There are some. But when looking for them, be aware that the 'lemon' tag usually means there will be sexual or romantic situations that might not be suitable for all audiences. Some popular fanfiction websites might have a good selection, but always respect the rules and guidelines of the site.