Sirius would be shocked at first. He had grieved for his brother, so his return would bring a mix of emotions like anger for being left in the dark and joy at having his brother back. Their relationship would be complex as they'd have to deal with the past. Sirius might also be a bit jealous if Regulus was getting more attention or if he seemed to have a better plan against Voldemort.
His return could cause a stir among the old families. The Blacks were a powerful family, and his return might shift some power dynamics. Also, those who knew him as a Death Eater would be very suspicious.
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.
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.
One common plotline is Regulus joining the fight against Voldemort after faking his death. He uses his knowledge of the Death Eaters to help the Order of the Phoenix. Another is his relationship with Sirius. They get a chance to reconcile and work together.
Fanfiction.net is a great place to start. It has a large collection of fanfictions, including those about Sirius and Regulus Black in the lemon genre. Just use the search bar and type in their names along with 'lemon' if you're specifically looking for that type of story.
One idea could be that Regulus, after faking his death, has been secretly working against Voldemort all this time. He could be gathering intelligence and using his knowledge of the Death Eaters to undermine their plans. Another plot could involve Regulus coming back into the wizarding world and having to deal with the changed perception of him, as everyone thought he was dead. He might also have to face his family again, especially Sirius, and deal with the complex emotions that come with it.
There's a fanfiction called 'Regulus's Redemption'. In this, it focuses on Regulus's journey after he realizes the true nature of the Death Eaters. It also weaves in Sirius's attempts to save his brother, despite their estrangement. It's a great read as it shows the complex emotions between the two brothers.