Chapter Text
The house on Grimmauld Place had never felt like a home, even when it was full of voices.
Now it felt like a memory that refused to stay buried.
The curtains were drawn though it was day, heavy velvet swallowing what little light London dared offer. Portraits along the walls muttered under their breath, some asleep, some pretending not to be awake at all. The Black family house-elf had long since stopped caring about politeness. Everything here was old grief and older secrets.
Lyra Potter stood in the hallway, fingers curled around the banister as though it might steady her.
It didn’t.
She could still hear Sirius’ laugh if she focused too hard.
That was the worst part.
He was gone, and the house had not yet accepted it.
Neither had she.
Footsteps echoed upstairs.
Harry Potter was pacing again.
He had been pacing since the funeral.
Since the Ministry.
Since everything shattered.
Lyra didn’t go up immediately. She stayed where she was, staring at the cracked mirror on the wall opposite her. It reflected her face too clearly—green eyes too bright for the gloom, dark hair falling loose, the same shape of mouth she had once thought belonged only to her.
Only now she knew better.
Now she knew there was another boy in the world who looked at her and saw a stolen reflection.
And he was upstairs.
A door creaked.
“Stop it,” Harry’s voice snapped suddenly, sharp enough to cut stone. “Just—stop following me around.”
“I’m not,” came Hermione Granger’s tired reply.
Ron Weasley muttered something Lyra couldn’t hear.
Harry didn’t stop pacing.
Lyra finally moved.
When she reached the doorway of the sitting room, the conversation died the moment she appeared.
It always did.
Not because she demanded attention.
Because she didn’t.
And still, she took it.
Harry looked at her like she was an unanswered question he hated.
Hermione looked like she wanted to fix something that couldn’t be fixed.
Ron looked uncomfortable, as if the room itself had become too small.
“You were going to tell me?” Harry said at last.
No greeting. No hesitation.
Lyra didn’t pretend not to understand.
“I didn’t know how,” she said quietly.
“That’s funny,” Harry replied, voice low. “Because you seemed to know everything else.”
A silence dropped between them.
Heavy. Familiar.
Lyra stepped fully into the room.
“I didn’t know I existed either,” she said.
That made Ron shift awkwardly. Hermione’s eyes softened in warning, like she knew this was a wound about to reopen.
Harry let out a short, humorless laugh.
“You’re joking.”
“No.”
The word landed wrong.
Harry stopped pacing.
For the first time in days, he stood still.
Lyra felt it then—the way the air changed when truth finally stopped pretending to be negotiable.
A floorboard creaked above them.
Neither of them looked up.
They didn’t need to.
They both already knew who was coming.
Professor Albus Dumbledore entered without urgency, as if grief did not apply to him in the same way it applied to everyone else.
Lyra watched him carefully.
She had decided, weeks ago, that she did not trust him.
That feeling had not changed.
Harry turned immediately.
“You said you’d explain,” Harry said.
“I did,” Dumbledore replied gently. “And I will.”
His gaze moved to Lyra.
It lingered there a fraction too long.
As if he were measuring the weight of something he had already decided to carry.
Lyra straightened.
Sirius had taught her not to shrink under attention like that.
Even when it felt like judgment.
Especially then.
Dumbledore folded his hands.
“I believe,” he said, “that it is time you both understood the truth of your family.”
Harry’s expression tightened.
“My family?” he repeated.
Lyra felt something cold settle in her stomach.
Dumbledore nodded once.
“Yes,” he said. “All of it.”
The room seemed to hold its breath.
Even the portraits stopped whispering.
Dumbledore’s eyes moved between them again.
“Harry, you were raised believing you were an only child,” he said softly. “But that was never entirely the truth.”
Harry’s jaw clenched.
Lyra didn’t move.
“There was a reason,” Dumbledore continued, “that certain protections were placed around you after your parents’ deaths. And there was a reason one child was placed with the Dursleys… while another was hidden elsewhere.”
Silence.
Then Harry spoke, voice dangerously quiet.
“Another child.”
Dumbledore inclined his head.
“Yes.”
Lyra felt the word before she understood it.
Like a spell cast without wand or warning.
Harry looked at her.
Really looked at her.
And something in his face cracked—not into belief, not yet, but into recognition so sharp it bordered on pain.
“No,” Harry said immediately.
Lyra’s throat tightened.
Dumbledore did not stop.
“You have a sister, Harry.”
The world tilted.
Ron swore under his breath.
Hermione’s hand flew to her mouth.
Harry stepped back as if struck.
“That’s impossible,” he said.
Lyra finally spoke.
“It isn’t.”
Harry’s eyes snapped to her.
Something in him went furious instantly, as if anger was easier than anything else.
“You knew?” he demanded.
“No,” Lyra said again, more firmly now. “I didn’t know what I was. I didn’t know you existed like this.”
Harry’s voice rose.
“You’re lying.”
Dumbledore raised a hand slightly.
“Harry,” he said calmly, “your sister was raised under the protection of Sirius Black.”
That name changed the air again.
Harry froze.
Lyra didn’t.
She felt it like a blade turning in her chest.
Sirius.
Gone.
Still everywhere.
Dumbledore continued, quieter now.
“After the deaths of Lily and James Potter, it was believed that separating the children would provide the safest chance of survival. Sirius insisted on taking one of you into hiding. The other remained under the protections already established.”
Harry shook his head.
“No,” he said again, but weaker now. “Sirius would’ve told me.”
Lyra flinched at that.
Because she had believed the same thing.
Dumbledore looked at her then.
And his voice softened in a way that felt almost like apology.
“He intended to,” he said. “When the time was right.”
A bitter laugh escaped Harry.
“Oh, brilliant,” he snapped. “So I’ve got a sister and nobody thought I should know until now?”
Lyra’s hands curled into fists.
“You think I asked for this?” she said sharply.
Harry turned on her instantly.
“You were with him,” he said, voice shaking. “You had him. You had Sirius.”
The accusation hit harder than she expected.
Because it was half grief.
And half jealousy.
“I lost him too,” she said.
Harry didn’t answer.
He looked away first.
That hurt more than the shouting.
Dumbledore stepped forward slightly, bringing the room back under control simply by existing within it.
“There is more you must understand,” he said.
Lyra already didn’t like the sound of that.
Harry didn’t speak.
Dumbledore’s gaze settled on Lyra fully now.
“When Sirius Black died,” he said gently, “it became necessary to bring you here. To Hogwarts. For your protection—and for the truth to finally be spoken.”
Lyra felt the floor beneath her go strangely distant.
“You brought me here,” she said slowly, “after he died.”
Dumbledore did not deny it.
Harry’s voice cut in, raw.
“So you only tell us now? After everything?”
Silence answered him.
Lyra looked at Harry again.
Really looked this time.
Not as an enemy.
Not as a stranger.
As something uncomfortably close to herself.
Same eyes.
Same inheritance.
Different lives carved from the same broken moment.
And for the first time since Dumbledore had spoken, Lyra understood what the Sorting Hat would later see in her without hesitation.
Not light.
Not darkness.
But survival.
Dumbledore’s voice was soft again.
“I am sorry,” he said.
It was not enough.
It would never be enough.
Harry turned away sharply, breathing hard, as if the room itself had become too small to contain him.
Lyra didn’t move toward him.
She didn’t know how.
Instead, she felt something inside her shift—quiet, dangerous, irreversible.
Because somewhere in the wreckage of Sirius Black’s last secrets…
She was no longer just lost.
She was found.
And she did not yet know whether that was mercy.
Or a beginning of something far worse.
Above them, Grimmauld Place creaked like it was remembering how to keep secrets.
And far below the surface of everything unsaid—
The House of Serpents had already begun to wake.