They might use the car as a means of escape. Sirius could be driving the car while Hermione casts protective spells around it to keep them safe from pursuers.
It's possible that the car is broken down. Hermione would start by examining it methodically, looking for the source of the problem. Sirius, on the other hand, would be impatient and might suggest using brute force or magic to fix it right away. Their different approaches could lead to some interesting exchanges as they both try to get the car up and running again.
Maybe the car is sentient. Hermione would be curious about its magical properties and Sirius might be more cautious around it. They could have a conversation where Hermione tries to convince Sirius to let her study the car further, and Sirius is worried about the potential risks.
They could interact with a sense of newfound peace. Sirius might be the first to approach Regulus with open arms, ready to forgive all the past. And Regulus would be a bit more reserved at first but then slowly warm up. They might sit together in a beautiful, otherworldly garden and just talk for hours, catching up on everything that happened since they were last together.
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.
In such a fanfiction, they could be on a quest and the car could be a magical vehicle that malfunctions. Hermione might use her intelligence to try and fix it while Sirius uses his experience to protect them from any threats that come their way during this situation.
In many fanfictions, Sirius Black might protect Hermione from various threats. For example, he could shield her from dark wizards who target her for her intelligence or her connection to Harry. He might also protect her from the more traditional Hogwarts bullies. His protective nature could stem from seeing her as a valuable member of the group around Harry, like a little sister figure.
Often, Sirius Black interacts with the Whomping Willow in a very brave and sometimes reckless way in fanfiction. He might just charge at it, using his quick reflexes to avoid getting hit while he tries to access the secret passage it guards. His interactions are usually driven by his need to get in or out of Hogwarts secretly.
In many fanfictions, Sirius Black might comfort Hermione by using his own experiences. For example, he could share his tales of survival against the dark forces, showing Hermione that she can also endure tough situations. He might also offer her a safe space, like in Grimmauld Place, where she can relax and feel protected.
In some fanfictions, Sirius Black helps Hermione with her studies. For example, he might share his own experiences with difficult spells and potions, which he learned during his time at Hogwarts. This kind of help can give Hermione new insights and make her even more proficient in magic.
One great fanfiction where Sirius Black helps Hermione could be 'The Bond of Magic'. In this story, Sirius uses his knowledge of the wizarding world's darker secrets to help Hermione solve a complex mystery at Hogwarts. It shows their relationship evolving as they work together, with Sirius being a mentor - like figure to Hermione.
There's a fanfic called 'Sirius and Hermione's Unbreakable Bond'. It starts with Sirius seeing Hermione's potential from the very beginning. He becomes a mentor to her, which is different from their normal Hogwarts interactions. The story delves deep into how their different experiences in the wizarding world bring them closer. Hermione's intelligence and Sirius' rebellious spirit create a unique dynamic between them.
Yes, it can be. Sirius Black has a complex character with his own backstory, and when incorporating him into Hermione - centric fanfiction, it's tough to balance his personality traits like his recklessness and loyalty with Hermione's studious and rule - following nature. Their different personalities and the existing canon storylines can make it a difficult task to create a believable and engaging plot.