Fics like Dog-Star and Lion-Heart

After Sirius leaves home, the only way that Regulus will allow his brother anywhere near him is when Sirius is in dog-form. Regulus has no idea that the Grim-like creature he shares secrets and bacon sandwiches with is his brother. He has no idea, that is, until he tries to say goodbye to 'Snuffles' for the last time, and his canine friend finally reveals his human form. (written for the HP Animagus Fest 2021)

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