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Sixth year was difficult for Sirius. He felt guilty about a lot of things, and he wasn't ready for everything to start changing at Hogwarts. He's trying to mend his relationship with Regulus while trying to figure himself out, as well as keeping safe during the beginning of the First Wizarding War.
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I don't own any of these characters. They all belong to J.K. Rowling and the Harry Potter franchise.