Dumbledore sat quietly in his office, thoughtful and apprehensive. He stirred the contents of his pensieve as if wishing for them to disappear. A knock on the door interrupted his thoughts.
"Come in," he said softly, fully expecting his guests.
The solid wooden door opened, and entered Harry Potter and Ginny Weasley. Both seemed mildly surprised and confused about the meeting, but not uncomfortable.
"Sit down," Dumbledore said, gesturing to the two chairs placed in front of his desk. "I'm sure you're wondering why I've called you here on the first day of classes. Don't worry, Harry, Professor Snape hasn't ordered your expulsion from this school. "Yet."
Harry chuckled, which betrayed the fact that he had been vaguely concerned.
"You are here because of a prophecy which was given, concerning both of you. Harry, you and I spoke of another prophecy at the end of last term. This one does not contradict it, but it does add an unexpected chapter to it. He nudged the contents of the pensieve, and, neither liquid, nor gas, they began to rise in the form of someone Harry and Ginny both recognized. In a horrible voice, Professor Trewlawney began to speak:
"The chosen one and the only daughter amongst seven
Will bear a child, without whom, all will be lost.
The child, brought into the world completely alone,
save for it's parents, will provide an ending to the endless war."
As Trewlawney sunk back into the bowl, Harry and Ginny stared at each other, horrified.
"Now," said Dumbledore, shaking the students from their moment of silent contemplation, "You have to make a decision. Will you act on this prophecy?"
After a long pause, Ginny croaked, "We have to, don't we? I mean, if this will end the war, then we have no choice."
"No." Dumbledore said, "You always have a choice. Living with the thought that you have no control over your future is entirely miserable. If you decide that you will have this child, you will need to be entirely sure that you are fully committed. You can't change your mind halfway."
Harry cleared his throat, and then said, "Well, it's more Ginny's choice than mine. I don't really play a huge part in this."
"Actually, Harry, you do. The prophecy is very specific about the pregnancy occurring away from everyone aside from the father. I have bewitched a deserted classroom to function in a similar way to the Room of Requirement. Should you agree to this, both of you will be locked in the room for the nine months. I'll fill you in on the rest of the details, later."
Ginny said, in an unexpectedly strong voice, "I'll do needs to be done, and I'm the only person who can, so I will."
Dumbledore smiled at her, "Wonderful, Ginny, but are you completely certain?"
"I am," she answered, and then blushed scarlet, "Partially because, if you don't mind me saying this, it's Harry. I feel safe around him."
Harry stared at her, considering this, and then announced, "I'll say 'yes' then, too. This is too important to ignore."
Dumbledore smiled, but his eyes here a little bit sad. "Okay, so now the details. On the 4th floor, there is a statue of a unicorn. You will walk up to it, and scratch it behind it's left ear. It'll slide back into the wall, exposing a secret passage. I want you to go there now, and the rest of the information will be there for you. We'll speak soon. Oh, and if you come to a door, don't let it's actions alarm you."