"A Nukalavee? Are you sure, Mister Potter?" asked Professor McGonagall.
"Yeah, that's a big deal, you know. Don't go pulling our legs now, alright, kid?" said Professor Winchester, the shorter haired one. Dean, if Harry remembered correctly.
"Yes, I'm positive. I looked it up in Newt Scamander's book, Fantastic Beasts and Where to Find Them. It described my creature perfectly. And it turns out, not only is my Animagus form extremely rare, it's look is ultra rare" he said.
"Well, Mister Potter. I have personally taught Mister Scamander, and I know that he was a bit… off his rocker…" she said, hoping that Harry were wrong about his form.
"But, professors! I have proof! I have pictures I took in the woods of me shifting, and the full product! I have a journal that logs my transformations and my days as the Nukalavee! Please, you have to believe me!" Harry said, pleading.
"I'm sorry, kid. Listen to Mummy Face here" Dean said, ignoring the glare coming from McGonagall. "You probably have the wrong creature" he said with a shrug.
Harry was silent for a bit before he spoke in almost a whisper. "Then I'll prove it to you. Professor McGonagall, Professor Winchester, will you get Professor Hagrid and Headmaster Dumbledoor and meet me at the Quidditch Pitch? In fifteen minutes?" he asks, hope alive in his eyes.
"Mister Potter… this is a serious matter" the stern Scotswoman says.
"I know. Please, though. I need someone to know, cause it's too much of a burden to bare, holding such a big secret"
No one spoke for several minutes. The silence was so thick that it had to take multiple Cutting Curses, or even multiple Sectumsempra to cut it. Eventually, McGonagall broke it.
"Alright, Mister Potter. I will get the teachers, and we'll meet you at the Pitch. Better not be lying"
"I promise I'm telling the truth. Oh, bring Snape too. I wanna talk to him" Harry grins, before walking away to the Pitch.
Harry was starting to get impatient. He's been here for nearly twenty minutes and not one teacher has come. Well, except for Fitch, who was pissed beyond anything. Until Harry explained what was happening. He the stalked off, grumbling to himself.
Finally, the teachers showed up to the Pitch. He decides to voice his discomfort.
"Finally! I was about to go get you guys myself!" he said with a small grin. This causes Snape to scowl a bit. "Oh, stuff it, Scales. I'll get to you later" he said with a small, knowing wink. This causes Snape to become speechless.
"So, Harry. I heard from Professor McGonagall and Professor Winchester that you've become a rare Animagus. Not only that, but it's look is also very rare. Is this true" asked Dumbledore, who's eyes have that same bright twinkle in it.
"It is, Professor Dumbledore" he said. "And I'll prove it" he said, as he starts to strip. Luckily, it was a warm night, so he didn't have to worry about freezing Little Harry off. This causes Hagrid and McGonagall blush (1)
He inhaled deeply and exhaled, willing himself to shift.
His arms stretched to unnatural lengths, getting thinner. His chest broadened. He started growing a second torso, where his legs were. He gets two pairs of legs, and a tail of bone. His hair disappears. He grows two great horns from his head. A second head grows on the second torso, this one being a stallion with a mane of smoke, and glowing crimson eyes. His skin becomes inky black. Bone armor comes from the skin, covering his chest, the stallion head, and the rider's head. His fingers meld together into three long, bony fingers. Long bone protrudes from his back. He twitches a bit and kneels to the teachers, so both pairs of eyes can meet theirs.
They're speechless. Never have they ever thought to see a Nukulavee before. Much less see the Boy Who Lived turn into one.
"O-Okay… you proved yourself, Mister Potter…" said McGonagall.
"Blimey, 'arry! Beautiful, 'at is!" shouted Hagrid. Dumbledore just kept smiling, the twinkle intensifying. Snape's jaw is in Hell, it dropped so far. And finally, Dean. He… has a sawed off shotgun aimed at him.
Harry just shrugged and shifted back. He quickly got dressed, smiling. "I'm glad I was able to show you guys. I'm relieved that I could do this" he said.
"It's great and all, Potter, but will you come with me?" asked Snape, who seems a bit… saddened. Harry just shrugs and follows.
In Snape's office, Harry was waiting for Snape to stop pacing.
"Alright," Snape said. "Explain. How do you know Scales. How were you able to become an Animagus, when most seventh years can't? Explain" he says, his eyes boring into Harry, which Harry thought would be intimidating, but now it's just… there.
"Well, Scales. It's because of your help with the Marauders, that I know" he grins. "It was relatively easy. You and Scales both love your potions, and are very strict with it" he said.
Snape went quiet before speaking up. "Promise you won't tell anyone. Please" he said, almost pleading.
"Alright" Harry said with a shrug.
"Alright?" Snape asks, confused. "Just, alright? No bribery? No making deals? No blackmail? Just… alright"
"Yeah, alright" Harry says. "I'm not my father, Snape. I know when people need something kept secret. And I'll keep yours. However, I will call you Scales in private, as long as you call me Nuke" he says with a grin, extending his hand.
Snape shakes. "Wait, Nuke? Why do you want to be named by a Muggle weapon?" he asks.
"Short for Nukalavee" he says, smiling. "Night, Scales" he says as he walks out.
"Night, Nuke" Scales says as he smiles.
(1) Hagrid is a female in the story.