One plotline could be that Sirius falls in love with a healer - in - training. He gets injured during one of his adventures and she takes care of him. Their relationship blossoms as he recovers and they find they have a deep connection through their shared love for helping others.
Perhaps a plotline where Sirius Black discovers a hidden prophecy related to Harry Potter that requires Harry to submit to Sirius in a series of magical trials. These trials could be designed to unlock Harry's true potential. Or it could be a plotline where the wizarding world is in chaos, and Sirius, with his knowledge and experience, convinces Harry that submitting to his leadership is the only way to restore order. This could involve Harry following Sirius' orders in battles, in diplomatic relations with other magical creatures, and in reforming the Ministry of Magic.
In a fanfiction, there could be a plot where Hermione starts tutoring younger students in advanced magic. Sirius witnesses her teaching skills and her passion for knowledge. He begins to see her not just as a young witch, but as a very attractive and intelligent woman. Another idea is that they are both on a secret mission for the Order of the Phoenix. Hermione's ability to stay calm under pressure and her strategic thinking during the mission makes Sirius feel a strong attraction towards her.
One plotline could be that Sirius is trying to make Remus Lupin jealous by flirting with Hermione. He might not have real feelings at first but then actually starts to develop them as he gets to know her better.
One possible plotline could be that Harry has done something dangerous in the wizarding world, like sneaking into the Forbidden Forest without permission. Sirius, as his godfather, decides to give him a mild spanking as a form of discipline while also explaining why his actions were wrong and how they could have put him in great danger.
A plotline might involve Sirius and Harry living together and Sirius trying to give Harry a normal family life. He could cook for Harry, help him with his homework, and they could have a pet together. Maybe they get a Kneazle, and Harry learns to take care of it with Sirius' guidance. This would be a contrast to the cold and often neglectful treatment he received from the Dursleys. And as Harry grows, Sirius could introduce him to his old friends like Remus Lupin in a more family - like setting, strengthening Harry's support system.
In a different plotline, Gajeel is tasked with protecting a princess - like figure. At first, he just sees it as a job, but as he spends time with her, he discovers her kind heart and intelligence. She, in turn, is drawn to his strength and loyalty. Their relationship develops slowly as they face various threats to the kingdom together, and their love blossoms in the midst of chaos.
One possible plotline could be Harry finding some long - lost evidence that clears Sirius. For example, he might discover a magically - hidden memory in an old object that shows Sirius was framed. Another plotline could involve Harry using his unique connection with Voldemort's mind to find out the truth about who really set up Sirius. Maybe through some shared visions, he gets a clue that leads him to the real culprit.
One possible plotline could be the daughter's discovery of her true identity. Maybe she was raised in an ordinary Muggle family and suddenly strange things start to happen. She begins to show magical abilities and then discovers she is Sirius Black's daughter. Another plot could involve her search for her father's legacy within the wizarding world, facing both friends and foes along the way.
One possible plotline could be that Sirius Black has been under some dark magic influence. Maybe a powerful dark wizard has managed to manipulate his mind, making him believe Harry Potter is a threat to him or the wizarding world in some false way. This could lead to a series of events where Harry tries to prove his innocence and figure out what's wrong with Sirius. Another could be that there's a misunderstanding based on some prophecy or false information spread within the wizarding community. Sirius, being impulsive, jumps to conclusions and decides to disown Harry without fully understanding the situation.
One possible plotline could be Sirius struggling with the disorder in secret while trying to maintain his tough exterior in the wizarding world. Maybe he's using it as a way to cope with the stress of his family situation and his time in Azkaban. His friends might start to notice small signs like his lack of appetite at meals or his weight loss, and gradually try to help him.