Minerva sat in her chair in the headmistress' office, nursing a glass of scotch. She's tired after another long day of dealing with the ministry and plans for the coming year.
She's nearing her 30th year as head of Hogwarts. Noting the fire had gotten low she stood, albeit shakily both from age and drink, and made her way to the fireplace.
As she got there the room lightened and she felt a warmth that had nothing to do with burning logs. Her eyes widen and she turned when she heard a voice that went silent decades ago.
"You were always my favorite even if you were a tough old bird." Then the barking laugh of Sirius Black filled the office, "It's time, Minnie, we've been sent to collect you."
As he said this, James, Remus, and, to her surprise Fred, all appeared beside him. All four wore smiles that extended beyond their tear filled eyes as they welcomed her to the next great adventure.