Their relationship might be filled with regret. Sirius might regret not being able to save Regulus earlier. He could have blamed himself for not realizing how much his brother was struggling. Regulus, on the other hand, might regret not being able to fully break free from the Black family's dark influence and be more like Sirius. But through this regret, they could also find a way to forgive each other and move forward in the afterlife, perhaps exploring the new, peaceful world around them together.
Well, they could be very protective of each other in the afterlife. After all the hardships they faced in life, they would want to make sure the other is safe. They might form a sort of alliance against any negative forces or memories that still linger. Since they both had such complex lives, they could share their experiences with other souls in the afterlife, with Sirius being the more outspoken one and Regulus adding his more nuanced insights. And they would definitely keep an eye out for any signs of danger from the remnants of the Death Eaters or other dark entities, even in the afterlife.
In the afterlife, their relationship could be one of healing. Regulus, having made amends for his past mistakes in a way, could finally have an open and honest conversation with Sirius. They might start to understand each other's motives better. Sirius could see that Regulus was always trying to fight the dark forces in his own way, and Regulus could understand Sirius' need for freedom and justice. They could spend time reminiscing about their childhood, both the good and the bad parts, and form a closer bond than they ever had in life.
Fanfiction about these three can take many forms. For example, there could be time - travel fics where Harry goes back in time and meets Regulus and Sirius when they were younger. This could lead to all sorts of interesting plot twists, like Harry trying to prevent Regulus from joining the Death Eaters in the first place. Or it could be a fic where Sirius survives and he and Harry explore the secrets of the Black family together, including things that Regulus left behind. There are also fics that focus on the emotional bonds between the characters, showing how the different personalities of Regulus, Sirius, and Harry interact and influence each other.
I recommend 'Regulus and Sirius: A Forbidden Bond'. This fanfic beautifully portrays the complex emotions between the two brothers. It shows how their different paths in life affected their bond. There are some really heart - wrenching scenes that make it a must - read for fans of the Blacks.
Well, their relationship is very complex and full of drama. Fans love exploring the different aspects of it through fanfiction.
One common theme is their relationship as brothers. Many fics explore the complex dynamic between them, from their early days in the Black family to their diverging paths. For example, some stories focus on how Sirius's rebellious nature clashed with Regulus's initial loyalty to the family.
It could also be a case of miscommunication. Sirius might think that Regulus has some crucial information that could help in the fight against Voldemort. So, in his haste and desperation, he kidnaps Regulus to extract that information, not realizing that there are other ways to go about it.
Their relationship would likely deepen. With no more threats or battles, they can focus on just being friends. They could become even closer as they share their hopes and dreams that were cut short in life.
It could be a story where Hedwig serves as a sort of guide for Snape in the afterlife. Maybe she shows him the good he did that was overlooked in life.
In the fanfiction, they might have a heartfelt reunion. They could share all the things they didn't get to say before. Maybe they'd talk about their friends left behind, like Remus and Harry. They'd probably also recall their adventures at Hogwarts, from the pranks they played to the battles they fought together.
A fanfiction with this premise might explore how Regulus changes Hufflepuff. His Slytherin upbringing could bring in a different perspective. He might introduce new ways of thinking about magic and the wizarding world to his Hufflepuff housemates. For instance, he could have a more cut - throat approach to Quidditch (a Slytherin trait) which could initially shock the Hufflepuffs but then inspire them to be more competitive in a healthy way. At the same time, Hufflepuff's values start to change him too, making him more open - hearted and less concerned with pure - blood status.
One great Sirius and Regulus Black lemon fanfiction is 'The Black Brothers' Bond' on Fanfiction.net. It really delves into their complex relationship in a unique way within the context of the lemon genre.