When the Final Battle of the Second War is at an end and the dead have been gathered, Minerva McGonagall decides she needs to go for a walk. She can feel her emotions beginning to get the better of her. She wanders through the school, or what's left of it, watching her colleagues repairing the school and its protections. She finds herself at the entrance to her office. She instinctively goes up to her office, though it still doesn't feel like hers. This office has been a sanctuary both when Albus was headmaster and now that she is in charge of the school. Clearly someone else feels that way Minerva thinks as she approaches the door to her office and can hear someone crying inside. Minerva slowly and quietly opens the door to her office.
"You can come in Professor. It is your office." Harry Potter's dejected voice comes out of the dark.
"Harry what on earth are you doing in here? You should be celebrating." Minerva waves her wand to light the room.
"I can't celebrate. Not with everything that happened tonight. Not with everything I found out. Look up at the portraits." Harry says heavily.
Minerva looks up at the portraits and is instantly angry. She climbs up on a wooden chair to come face to face with the portrait. "Severus Snape! Your portrait shouldn't be up there! You murdered the man I love!"
"He didn't murder me, Minerva. He killed my decoy because I asked him to, because I thought Harry had a better chance of success without me around as a target. I was right. I'm coming back to you very soon, my dear." Albus says from his portrait.
"Severus is this true?" Minerva asks obviously shocked.
"Yes, Albus and I set this all up to protect you and Harry. I didn't agree with the plan at first, but it does seem to have worked. Well done, Harry, and thank you for trying to save me." Severus says gently.
"You tried to save him?" Minerva asks stepping down off the chair.
"Yes, he'd been bitten by Nagini and I knew the truth by then and I didn't want to see him die, but I couldn't save him. It was actually a very touching moment for the two of us. I was very surprised when he gave me his memories. I have some wonderful memories of my mother now though." Harry tells his former professor.
"You did all this to protect us, didn't you, Severus?" Minerva asks looking up at Severus' portrait.
"Yes, I did. I knew from the first moment I stepped into Hogwarts that it was where I belonged, very much like Harry. I did everything I did to protect the people I care about which despite Harry's impressions always included him. I died because I wouldn't give Voldemort any more information. I knew I could give Harry more time that I knew he needed. I never expected to live through the war. I knew that wasn't my fate. I'm glad everything worked out. Minerva, will you finally tell Albus how you feel now that you know he's alive?" Severus asks seriously. He knows that Minerva has loved Albus for years. Minerva told him so 10 years ago.
Minerva sighs heavily. She's still trying to take everything in that's just been told to her. "Yes, I'll tell Albus as soon as I see him again."