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November 3, 1981
Peter Pettigrew made his way casually through the crowded London street, occasionally looking around nervously. He'd seen the Grim out of the corner of his eye a few times and knew Sirius was waiting until the Muggle crowd was thinner. Suddenly, he heard movement behind him, and the animagus turned quickly and darted down a narrow alley. He'd only made it halfway when a voice like cut glass sliced through the night.
"It's over, Peter! I've got you now!"
Peter turned to face his pursuer, drawing his wand slowly as he did. "Traitor, Sirius? You'd know all about being a traitor, don't you?"
"What's that, Wormtail? Do you want to make some pitiful excuse for why you did what you did?" Sirius's wand was fixed on Peter, and Black had a murderous look in his eyes.
"I have no excuses for you, Death Eater!" shouted Peter, defiantly.
"What?! What the hell are you..." Whatever Sirius Black had mean to say was interrupted as a voice behind him yelled out "EXPELLIARUMUS!" and his wand flew out of his hand. Whirling quickly, he was shocked when James Potter whipped off his invisibility cloak to catch Black's wand easily with his off hand. Sirius's shock and relief that his friend was still alive was quickly replaced by concern over the look in James's eye, a look of absolute hatred. "Prongs?" he said in surprise. Then, Pettigrew's Body-Bind Hex slammed into his exposed back. Sirius's arms and legs slammed together, and he fell to the ground.
Paralyzed, Sirius could only watch in silent horror as his best friend walked up to his prone body wearing the same look of hatred and contempt he'd worn back in school when they were dancing with Snivellus. "You thought you could betray us – betray me – the way you did and get away with it, Secret Keeper." With a snarl, he kicked the helpless Black in the ribs. The paralyzed Black made no sound, but his pain was still obvious.
"Aah! Dammit James, I wasn't your Secret Keeper! Peter was!" he thought desperately, but no words came. Nearby, there were soft pops as aurors apparated into the area to ward off any curious Muggles.
"Thank you for helping to catch him, Peter. Although I do wonder why he was so bent on killing you instead of just fleeing the country."
"No idea ... unless. He yelled out that I was a traitor. You know, Dumbledore may have known he was the Secret Keeper, but only the three of us and Lily were there when you cast the spell. Perhaps he thought that You-Know-Who had killed both of you. If he killed me as well, he could have claimed that you'd switched Secret Keepers. Merlin, what a sly bastard!"
Wormtail looked down at Sirius, seemingly disgusted with him, but his eyes were almost dancing with mirth. Despite himself, Sirius almost had to hand it to the other Marauder. He never imagined that Peter Pettigrew could be this ... cunning. Where had he been hiding it all these years?!
"So now that you've caught him, James, what are you going to do with him?"
"As tempting as the Killing Curse is right now, I'll let our wonderful judicial system handle him."
"James!" exclaimed Peter. "You're going to trust the Wizengamot to decide his fate? He's the Black Heir! And now that he's exposed as a blood purist, they'll be spendthrift in winning his freedom!"
"What do you want me to do?" hissed James. "Use the Killing Curse on him in front of a half-dozen aurors?"
Peter stepped closer and whispered urgently. "You're an auror yourself, James. I know you have a license to kill Death Eaters."
James stared at him for a second. Sirius's eyes almost bulged out of his head. Potter was considering it! Suddenly, James whipped his wand, and Sirius's sleeves ripped away. James sighed loudly.
"I have a license to kill marked Death Eaters, Peter. Obviously, he hasn't been marked yet." Peter looked frustrated, while James stared down at his (former) friend intensely. "Still, there are other Death Eater Laws on the books. In circumstances involving high ranking Death Eaters, we're allowed secret trials. Hell, even trials in absentia. Between my sworn testimony, Lily's, and yours, we'll have this bastard in Azkaban by tomorrow night."
"James," Peter said hesitantly, "I was happy, honored even, to help you catch Sirius. But I'm not an auror. I don't have a heavily warded estate. And I don't want to be looking over my shoulder for Death Eaters for the rest of my life. Do you really need oath-bound testimony from me against the Black Heir?"
James smiled fondly. "No, I guess not. Lily and I can handle it. I will need a statement from you about what happened between you here tonight just to complete the auror report, but I'll have it sealed." He put his hand on Peter's shoulder. "You've been a true friend tonight, better than I've deserved from you. I know I didn't always treat you right when we were at school, but I promise I'll make it up to you from now on." James turned to the other aurors. "Alright, gentlemen. I want this bastard stupified, bound, silenced and locked up in the deepest, dankest Ministry holding cell you can find. No one talks to him and no one knows where he is until after he's sentenced. Got it?"
As a chorus of "yessirs" rang out in the night, the still-paralyzed Sirius Black looked up into the face of Peter Pettigrew. It bore an expression of absolute victory it, and for the next twelve years, it would be the first image he saw at night when the Dementors came.
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