HP - Peter the Double Agent
"How could you, Peter?" Sirius asked him, "James and Lily, Peter, they were your friends! We would have protected you!"
Peter shook his head, "please, Sirius, listen to me, he said-he said-"
"Who said, Peter, your new Master? Voldemort killed them, Peter, only little Harry survived!"
Peter looked devastated, lowering his head in his hands, "it wasn't supposed to be like this, Siri, Dumbledore told me to go to him, told me to tell the dark lord the secret, he said he'd get them out in time." He looked up, pleadingly, tears leaking from his eyes, "they weren't supposed to die, Siri, he said he'd get them out..."
Sirius looked at him incredulously, "Dumbledore told you to give up the secret to the dark lord?" He asked, disbelieving.
Peter nodded, "I-I-I swear, Sirius, I-," he paused to take a deep breath, to stop his shuddering, "I, Peter Pettigrew, swear on my magic and my life that Albus Percival Wulfric Brian Dumbledore ordered me to tell the Secret of James, Lily and Hadrian Potter's location to Lord Voldemort."
There was a pulse of magic from his wand tip, and then he lit it to prove he still had his magic.
Sirius was silent for a moment, as though waiting for his suddenly shattered worldview to come together again. Then he nodded, "if Dumbledore has betrayed us, then you're going to have to go into hiding," he said. Peter smiled slightly through his tears.