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"It's not your fault." They were the first words Remus said to him once they've finally cleared the misunderstanding between them. The one where Sirius is supposedly capable of killing his best friend, his wife and child because Sirius was secretly in league with Voldemort.
As if he could ever betray Prongs like that.
James was practically his brother. His parents had taken in a strange bedraggled mess of a teen boy when Sirius had finally been formally disowned by his parents and given him everything he'd never had.
But it HAD been his fault in the end.
"I was the one who said to change the secret keeper. If-if it was me... I would have-"
"You would have died rather than tell. I know Padfoot. I know." Remus reassured him. "So would have I." He leaned over to a spot in the wall of the Shrieking Shack where the four of them once carved their names in the exposed wood of a beam and scratched a deep gouge through that of the one who'd betrayed them all.
Moony, Wormtail, Padfoot and Prongs.
"He's still out there." Remus sighed.
"I won't let him hurt Harry again." Sirius growled. He's so weak now that he can't maintain his human shape for much longer, Padfoot keeps pushing himself closer and closer to the surface. Spending so much of his time as a dog has more than one draw back.
"He won't." Remus' voice is filled with conviction. "We're going to catch him first."
Sirius crashed their lips together for the first time in more than a decade. It's hot, messy and tastes like coming home.