Albus Potter and the last Horcrux.

The cat gets defensive

Scorpius swirled up the staircase and knocked on the headmistress' door.
"Come in."
Scorpius, now embarrassed of his form, shuffled in nervously.
"Scorpius Malfoy! What has happened?!" Screeched the woman inside.
"Professor, I thought I-I should investigate-"
"You what?! Sco-"
"Shut up! I need to explain!" Screamed Scorpius. McGonagall seemed slightly taken aback by the boy's rage and kept silent.
"Look, I went into the willow, my dad and Voldemort were in there and killed me and I came back and" Scorpius babbled, "J'just thought you'd wanna know."
The ghost collapsed to the ground and fell through all seven floors of Hogwarts just as green and black smoke began to swirl around the room. Dark figures rose with it.
"I'm glad someone said the name, we've been bored." spoke a masked figure.
McGonagall rose from her seat, thought for a moment then pounced. The cat clashed into the masks, spinning off them one by one. The figures tried to grab but the cat was too fast.
"MEEEE-OWWWW" She screamed she scratched the life out of the last figure.
She spun into human form to see a huddle of around fifty students, mouths wide, watching.
"What?" She panted.
The child-mob sprinted back down the staircase.
McGonagall waltzed down around five minutes later and stood infront of the huge Hogwarts door.
She murmured the spell she was so happy to use nineteen years ago, it pained her to need it again. The woman still smirked as the knights clomped out. She waved her wand and the locks sealed.

Her smile faded as her eyes caught the sight of a man outside. The very same man who made the wrong choices. No, not Voldemort. She would know what to do if it was him, she would fight. But it wasn't.