Fics like split in two

Sirius has spent the past eight years of his life regretting the last words he said to his baby sibling. After a strange meeting with a man claiming to be his brother-in-law, Sirius realises he has an opportunity to make things right. And there really is no better time than the present, because his brother-in-law reveals something Sirius never could have predicted. His baby brother is dying, and Sirius might be the only person able to save him. [or, James does not know how to chill when it comes to his husband, Regulus is tired, Remus is the best, and Sirius just wants his brother to be okay.]

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