Perhaps the twist is that Sirius saves Draco, but in doing so, he sacrifices his own freedom. And then Draco has to figure out a way to return the favor and free Sirius. Or it could be that the reason Sirius saves Draco is not what it seems at first. Instead of pure altruism, he has a hidden motive related to his own past or a prophecy that involves Draco.
In many such fanfictions, Sirius might use his magic skills. He could be quicker and more powerful than Lucius in a duel. Maybe he uses a powerful spell to stun Lucius and then whisks Draco away to safety.
I really like 'Sirius and Draco: A New Alliance'. It takes place after the war and explores how they both have to deal with the aftermath. It's fascinating to see how they start to rely on each other and form a unique friendship that no one expected.
One great Draco and Sirius fanfiction is 'A Different Sort of Bond'. It explores an unlikely friendship between them in the Hogwarts setting. Another good one is 'The Unforeseen Alliance' which delves into how they might work together to solve a mystery in the wizarding world. And 'Beyond Enemies' shows a complex relationship development between Draco and Sirius.
The plot often revolves around Draco using his unique skills or knowledge to rescue other characters. It could be his understanding of the Dark Arts that helps him outwit villains and save his peers. This creates an interesting dynamic as he goes against the expected behavior of his family's values.
Well, in some of these fics, Sirius might time - travel to save Harry from a future threat. For example, he could see a vision of Harry being killed by Voldemort in a new and terrifying way, and then he uses time - turning magic to go back and change the course of events.
One common theme is family loyalty. Sirius is driven by his love for his brother and his sense of family duty to save Regulus. It shows that no matter how estranged they may seem, family bonds are strong.
Another theme is the power of love. Harry's love for Sirius gives him the strength and courage to face the many obstacles in his way. It's a theme that's often explored in fanfiction as it was also a big part of the original books. In these stories, Harry's love overcomes things like the dark magic surrounding Azkaban or the threats from Voldemort's followers.
One common theme is redemption. Draco, having been on the wrong side in the war, often has a journey of self - discovery and redemption, and Sirius can play a part in that. For example, Sirius might help Draco see the error of his ways.
There is a fanfiction titled 'Under Sirius' Watch'. In it, Sirius catches Harry and Draco sneaking around the castle at night. This leads to a series of events where Sirius has to decide whether to report them or try to understand what's really going on between the two. The story delves deep into the characters' emotions and the complex relationships within the Hogwarts world.