Author's Note: I do not own any of the Harry Potter characters. They belong to J.K. Rowling.
McGonnagall
Peter followed Professor McGonnagall to her office and took a seat when she offered him one.
"Now, Mr. Pettigrew, what for Merlin's sake was all that about?"
"Professor, I was telling you and Filch the truth when I said that I have no memory about what happened over the past several hours. The last thing I remember before the incident with Filch was leaving James and Lily's house."
"Apparently someone oblivated your memories from the past few hours. Now the major question is why? What would someone have to gain by casting Oblivate on you and then letting you show up at the one place where it could be reversed."
"Reversed?", asked Peter.
"Yes Mr. Pettigrew, reversed. Albus Dumbledore has a pensieve. With that pensieve, he can draw out memories and put them where they can be viewed by others or stored to allow them to be viewed by the owner at a later time. The latter reason would be for use after a traumatic experience. Unless the person who oblivated your memories did it in such a way as to actually remove them, all he did was put a block on them. Albus can draw your memories out and bypass the block."
"I remember learning about the Oblivate spell in charms class, but since my OWL in charms was not high enough to take NEWT level classes with Professor Flitwick, I never learned about how the spell could be cast to permanently remove memories vs just blocking them. I do remember Professor Flitwick telling us in either 4th or 5th year about the pensieve. He didn't mention anything about the Headmaster having one, however."
"It's not something that the Headmaster would let the student body normally be aware of Peter. Now that you are aware of it, are you willing to let me inform Albus of your need for its use in restoring your memories and hopefully figuring out why you are here at this time of night in the first place?"
"I guess so," said Peter not sure if he wanted anyone being able to reach into his mind like that. Why he had that fear he didn't know, but he knew that if he ever wanted to figure out what he was doing here in Minerva McGonnagall's office this late at night when he was no longer a student at Hogwarts and a member of her house, that he would have to use that Gryffindor courage and let Professor Dumbledore use the pensieve and extract the memories of the past several hours.
"I guess so? Do you or don't you Mr. Pettigrew?" asked Professor McGonnagall with a look in her eyes that would not allow for any answer other than yes.
Peter, having seen that look many times in his seven years in Gryffindor house, usually after he and the rest of the Marauders had gotten caught doing a prank on someone, usually Snape, could only answer one way.
"Yes, Professor. I'll let the Headmaster draw out the blocked memories and place them in the pensieve so that he can figure out why I'm here."
"That's better Peter. Use that Gryffindor courage that I know is in you. Remember that courage is being able to look fear in the eye and get past it. All of us have fears. Only an idiot says that he or she has no fears. Either that or a liar. The most courageous person has fear, but knows when to put that fear behind him or her and move ahead with a plan of action. Now are you ready to see the Headmaster?"
"Yes, let's do it," said Peter in a much stronger voice than before.
With that Professor McGonnagall with Peter in tow left her office and made their way to the Headmaster's office.
"Toblerone," said Minerva McGonnagall to the gargoyles at the entrance to the Headmaster's office.
"Come in Minerva, Peter," said Dumbledore when they reached the top of the stairs leading into the Headmaster's office.
'How does he do that?' Peter thought to himself when he reached the top of the stairs. 'He could not have known that Professor McGonnagall and I were coming here, yet he did.'
"What brings the two of you here at this hour?" Albus Dumbledore asked the two who just entered his office.
"We have need of your pensieve, Albus. Peter showed up here with no apparent knowledge of how he got here or why. Someone oblivated his memories of the past several hours and we need to find out what was blocked and hopefully why." Minerva McGonnagall told Dumbledore.
"Peter, as you know, we think that there is a leak in the Order of the Phoenix," Dumbledore said. "Someone has been giving Voldemort and his Death Eaters sensitive information about our membership and actions over the past several weeks. Your showing up with blocked memories tells me that they may have gotten information out of you then oblivated you to make you not remember doing anything. Since you showed up here at Hogwarts we can figure out what was blocked and what we have to do about it."
"Professor Dumbledore, I remember Professor Flitwick telling us about the pensieve during 4th or 5th year charms class, but we never got to see or use one," Peter said with a trace of the apprehension that he had when discussing it with McGonnagall in her office earlier, but was doing his best to control his fears. Why he was afraid to let Dumbledore extract his memories of the past few hours he still didn't know. What he knew is that he was afraid.
"Everything will be all right Peter." Dumbledore could sense Peter's apprehension, but he could also see that the young man was doing his best to control that fear. "We'll sit by my pensieve and I'll touch my wand to your head and draw out memories over the past day and place them in the pensieve. Then together we'll see what you've done today and what may have been done to you. But we won't start until you tell me that you're ready."