Hydrus thought about it for a few minutes, going over the pros and cons on telling this ill-tempered man who he was and how he got here. Azkaban must have done a number on his Sirius, because while he had a temper, he thought things out better than this Sirius. This guy was hard to deal with, with his constantly jumping emotions. Then again, maybe he was being too hard on the guy; after all he did just lost his best friend and if Hydrus remembered correctly Sirius was feeling a lot of guilt. The immortal knew the feeling well, years of therapy had helped, but he still felt like he failed. Both men were running on pure emotions.
Coming to a tentative decision he drew the Elder Wand and pointed it at the man, in case Sirius decided to snatch Harry and run. He then called Sirius's wand and threw it at him. "I'll give you one chance to be in Harry's life. You make a vow to me, here and now, that you will keep my secrets and I'll tell you everything. If you don't I will do as I threatened and wipe your memory of me, Harry and the last few days. Make your choice, vengeance or Harry?" he demanded, never lowering his wand.
You could see the war being fought in Sirius's head. His eyes would flit to Harry in sad thoughtfulness, then to Hydrus in confusion and then to the front door in anger. It was a long battle and Hydrus kept his wand pointed at the other man's head. Ten stressful minutes went by and finally Sirius's shoulders sagged in defeat.
"What do you want me to say?"
"Just vow that you will keep mine and Harry's secrets until such time as I release you," Hydrus said, still aiming his wand. He didn't trust the man; he was just so different than the Sirius he remembered. "If you still want Peter after you hear me out, I won't stop you."
"I need your full name."
"Hydrus Williamsford Black," was the succinct response. Hydrus hated that name, but George thought it up; said it sounded posh. So he kept it to remember his brother in all but blood.
That caused an eyebrow to rise. "I, Sirius Orion Black, do hereby swear on my life and magic to keep the secrets of Hydrus Williamsford Black and Harry James Potter, until such time as I am released of said vow," Sirius incanted, a blue light sealing the vow. "Now, tell me who you are and how you know everything."
Hydrus put his wand away in his pocketspace; causing Sirius's other eyebrow to rise. "To put it bluntly, I'm from the future."
"Right, everyone knows time travel is impossible," was the doubtful reply.
"Not if you are the Master of Death and wield the Deathstick."
"That's a myth. Look, if you're not going to tell me the truth, then why did you make me take a vow of silence?"
"Listen, you inbred moron—"
"Will you stop calling me that?"
"—I am telling you the truth." He pulled a book-reader from his storage and handed it to the disbelieving man. "This is a book-reader, invented in 1995 by a man named Frostwell. He left me his vault when there was only a rumor of the Dark Wanker rising again and a second war breaking out," he explained, ignoring the snort of disbelief. "On this device there are thousands of books, both magical and Muggle," he said, using the hated word.
Sirius took the device, but had no idea what to do with it. His knowledge of Muggle things was limited. Lily tried to educate him and James, but since they were in hiding most of the time, there was little she could teach. Sirius looked around the living room for the first time. There were weird items scattered everywhere. Over on the opposite wall from where he sat; there something he thought it was called a telly, only it didn't fit Lily's description. This box was large and flat, not big and bulky. There as a clock on the wall that appeared to be showing the time and the weather outside with numbers instead of hands. A very funny looking radio sat on the shelf, and a box he had no clue what was for, sat on the floor in front of the telly. All in all, it was bizarre, but it didn't prove the other man was from the future.
"This proves nothing, I need something more. I have no idea what Muggles do nowadays." He handed the book-reader back to Hydrus and folded his arms.
"Okay, I'll tell you a bit about your past," Hydrus nodded, he should've known it wouldn't be that easy. "You, James and the traitor are Animagi. You're a dog, James was a stag and Pettigrew is a rat. Remus is a werewolf. The four of you were known as the Marauders. Also I was the one who sent the letter warning you about Pettigrew. How did you send one back, anyway?"
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