the_debt_of_time

Harry rushed forward to help unchain Ron from Peter and Remus, but Sirius
quickly caught his godson around the middle and threw him backward toward the girl.
"Harry, leave it to me. Take her and run!"
A snarl came from Remus, who had hunched forward, his body elongating and
shifting. The sound of bones cracking echoed around them, and Sirius could hear the girl
let out a sob. He watched as she and Harry stood frozen, staring at the scene in front of
them.
He lunged forward and took his godson by the shoulders, breaking him out of his
stupor. "Harry! Keep her—keep them safe. It's your job," he said before stepping back and
letting his body shift downward into his Animagus form just as Moony, in his full glory,
stretched up and let out a piercing howl.
The werewolf reared and snapped its jaws toward the teenagers, wrenching himself
free from the bindings that tied him to Ron and Peter. Before he had a chance to snap
again at the injured boy on the ground, Padfoot leapt forward, clamping his jaws around
Moony's neck and forcing the weight of them both backward.
Sirius felt, not for the first time in his life, the claws of the werewolf tearing at him.
Eventually, they broke apart, and Padfoot growled viciously, putting himself
between the wolf and the path back to the Whomping Willow. Moony hovered dominantly
over him, and Sirius felt the pull to submit but fought against it. The wolf took notice of
the disobedience of his pack member and snarled, snapping his jaws against the skin and
fur of Padfoot's back. He let out a sharp yelp just as a loud howl came from elsewhere in
the woods.
Moony sat up quickly, releasing him. Padfoot fell to the ground whimpering and
bleeding, and he watched as Moony rapidly set off into the Forbidden Forest. Padfoot
whined as he got to his feet, using what strength he had to try and chase after the wolf, but
he only made it as far as the Black Lake where he collapsed onto the ground.
"Sirius!"
He could hear Harry screaming his name as he shifted back into his human form,
and a familiar unsettling cold washed over his body.
"No," Sirius moaned in pain and fear as hundreds of dementors descended upon
him. He could hear her in his head, his Mia, pleading for him not to leave her, begging him