Sirius would likely be extremely angry. He already has a protective streak towards Harry. He might immediately confront those he suspects of the abuse, whether it's the Dursleys or others at Hogwarts. He would probably also try to remove Harry from the situation as quickly as possible.
One common theme is redemption. Sirius often feels guilty for not being there for Harry earlier, and by saving him from abuse, he is redeeming himself in a way. For example, in many stories, he reflects on how he could have prevented Harry from going to the Dursleys in the first place.
Well, the theme of protection is quite prevalent. Sirius is very protective of Harry in these fics. Also, the theme of discovery. Harry discovers a new side of the wizarding world through Sirius. And friendship is also a big part. Harry makes new friends as he starts a new life with Sirius. These themes together create a rich and engaging story.
One popular 'sirius saves abused harry fanfiction' is 'The Bond of Blood'. In this story, Sirius discovers the extent of Harry's abuse at the Dursleys' and takes immediate action to rescue him. He uses his skills as an Animagus to secretly observe Harry and then stages a daring rescue, whisking Harry away to a safe place where he can heal and grow stronger under Sirius' protection.
One popular 'sirius adopts abused harry fanfiction' is 'The Debt of Time'. It delves deep into how Sirius takes Harry under his wing after realizing the extent of his abuse at the Dursleys. The story beautifully portrays their growing bond and how Sirius helps Harry heal from his traumas.
In such a fanfiction, Sirius might have to face various challenges while adopting Hermione. For example, there could be opposition from some parts of the wizarding community who might question his motives or his ability to take care of her. However, Sirius, with his strong will and love for Hermione, overcomes these obstacles. He might also help Hermione develop her magic skills further and give her the confidence she lacks due to the abuse she has endured.
One common theme could be miscommunication. Maybe Harry misunderstands Sirius' actions or intentions, leading to a situation that appears to be abuse. Another could be power dynamics, if the fanfic plays with the idea of Harry having some sort of power over Sirius in an unexpected way. But again, this is a very different take from the original story.
There might be some fanfics exploring complex relationships in a non - inappropriate way. However, the idea of 'abuse' in the context of Harry Potter and Sirius is quite dark and not in line with the general spirit of the original series. It's important to note that not all fanfics are well - written or appropriate, and one should be cautious when seeking such content.
One common theme could be the exploration of Sirius Black's complex character in a dark context. It might show how his past traumas could potentially lead to actions that seem like abuse, even if not in a traditional sense. Another theme could be the impact of such actions on other characters in the fanfiction universe.