Tangled in the weight of history, where every step forward was bound by the echoes of the past.

The house was fuller than it had been last summer.

The Weasleys had moved in, filling every creaking corridor with their noise and warmth. Hermione had arrived not long after, slipping seamlessly into the chaos. Even Remus was around more often, always ready with quiet reassurances and steadying glances.

And then there was Harry.

Harry, who had endured two miserable weeks at the Dursleys before finally being allowed to return. He barely spoke about it, but Sirius could see the weight hanging over him, pressing his shoulders down, dimming the fire in his eyes. There was something different about him now—something more withdrawn, something guarded— that made Sirius ache with helplessness. He wanted to fix it, to bring back the spark, but he didn't know how.

Yes, the house was full. Fuller than it had been in years.

And yet Sirius had never felt emptier.

It was a different kind of loneliness than last summer, when the house had been empty except for the echo of his own footsteps and Kreacher's endless grumbling. Then, at least, the solitude had been predictable. A constant.

Now, it felt sharper. More isolating.

Because now, he was surrounded by people—people he cared about, people who cared about him—and it still wasn't enough.

Because Severus was still avoiding him.

The Order meetings were still held at Grimmauld Place, and Severus still came. He still spoke in that same calm, clipped tone, still delivered his reports with the same unshakable certainty. But he never looked at Sirius. Not once.

And when he stayed behind to teach Harry Occlumency, he vanished the moment the lesson was over. Sirius never saw him linger, never caught him idling in the hallway, never even glimpsed his retreating form.

It was as if he had perfected the art of disappearing the second his duty was done.

Sirius knew it wasn't a coincidence.

He thought bitterly that maybe Severus had honed the skill back in their school days, when avoiding the Marauders had been an art form. Maybe some things never changed.

And maybe Sirius had been a fool to believe, even for a moment, that they ever would.

Remus noticed, of course.

Of all the people in this house, Remus had always been the one who could see through Sirius the easiest. It had been that way since they were teenagers—Sirius, all sharp edges and reckless laughter, and Remus, the quiet observer who knew when to push and when to hold back.

Now, Remus watched him with that same careful attentiveness, his gaze lingering a little too long, his words a little too measured.

Sirius knew what was coming before Remus even opened his mouth.

"Sirius," Remus said gently one evening, after an Order meeting had dispersed and most of the house had settled into a tired silence. "Are you all right?"

Sirius scoffed. "Since when have I ever been all right?" He flashed a grin, something sharp and hollow, but Remus wasn't fooled. He never was.

Remus sighed, setting down the book he had been pretending to read. "I just mean… You've been different lately."

Sirius shrugged. "Haven't we all?"

Remus didn't look away. Sirius could feel his gaze pressing into him, patient and knowing.

And maybe part of him wanted to say something. Maybe part of him wanted to admit that he had been feeling restless, raw, haunted by things he couldn't quite name. Maybe he wanted to talk about how Severus wouldn't look at him, how the house felt suffocating even when it was full, how every time he closed his eyes, he saw Harry's hollow expression after Cedric's death.

But instead, he redirected.

"I'm fine, Moony." Sirius leaned back, stretching out in his chair with a forced ease. "It's Harry we should be worrying about."

Remus didn't argue, but something flickered in his eyes—doubt, maybe, or reluctant acceptance.

Sirius pressed on. "He's been quiet since he got here. Withdrawn. Have you noticed? He barely talks unless someone asks him something directly."

Remus sighed again, but this time it was more resigned. "Of course I've noticed."

"He's barely eating, too," Sirius continued, as if saying it aloud would somehow make it easier to fix. "And he's not sleeping well. I hear him pacing some nights."

Remus watched him for another long moment before nodding. "You're right. We should keep an eye on him."

Sirius exhaled, relieved that the conversation had turned away from himself. This—this, at least—he could focus on.

Now was not the time to dwell on his own misery.

Harry needed them now. Harry needed him. And Sirius wanted to be the godfather he had promised to be, the one Lily and James had trusted when they named him Harry's guardian.

But the thought of them brought a sharp pang to his chest.

Lily. James. And Severus's cruel confession, still fresh in his mind.

"It was me. I was the one who passed the prophecy to the Dark Lord. I begged him to spare Lily—only Lily."

Sirius clenched his jaw, gripping the armrest of his chair so tightly his knuckles turned white.

He had always known Severus had been tangled in that mess, but hearing it—hearing it so plainly, with no room for doubt—had ripped something open inside him.

He couldn't think about it now. Wouldn't.

So he forced himself to focus on Harry instead, on the only thing that mattered.

The rest…

He could deal with later.

When the house fell silent at night, Sirius's mind refused to do the same.

He lay staring at the ceiling, tangled in restless thoughts, his body tense beneath blankets that still faintly carried Severus's scent.

It was maddening.

Severus had been here. In this very bed. His weight pressing into the mattress, his breath ghosting against Sirius's skin. And now, he was gone again, as if he had never been there at all.

But it wasn't Severus's absence that kept Sirius awake.

It was his words.

"It was me. I was the one who passed the prophecy to the Dark Lord. I begged him to spare Lily—only Lily."

Sirius exhaled sharply, dragging a hand over his face. Should he tell Harry? Should he tell Remus? It involved them, after all—especially Harry. Harry had lost his parents because of that prophecy. Because of Voldemort. Because of choices made long before he was even born.

But Severus had told him in confidence.

After Sirius had practically begged him to trust him.

He had wanted Severus to open up. To let him in, even just a little. And he had—just not in the way Sirius had expected. The truth had come like a slap, cutting deep and leaving him reeling.

Now he was left with this unbearable weight in his chest, caught between duty and something far more personal.

The idea of betrayal twisted in his stomach.

Hadn't Lily and James died because of betrayal?

Layer upon layer of it, woven so tightly together that by the time the truth had unraveled, it had already been too late.

Peter's betrayal of James. Severus's betrayal of Lily. His own failure—the fact that he had suspected the wrong person, that he had gone after Peter instead of protecting Harry, that he had let himself be taken, locked away in Azkaban while Harry grew up alone.

And now, here he was again, standing on the edge of another choice that could tip everything into disaster.

Sirius pressed his eyes shut, willing himself to find some clarity, some answer in the suffocating silence of the house.

He didn't know what to do.

All he knew was that, despite everything, he didn't want to betray Severus.

Sirius shot up so abruptly that the room seemed to tilt, his breath ragged, his heart pounding as if it had only just caught up with the weight of his realization.

Dumbledore had always insisted Severus was on their side. He had been a spy in the first war, a trusted ally. But when had he truly turned?

Dumbledore had never said.

And suddenly, the pieces fell into place with cruel, piercing clarity.

Severus had switched sides the moment Lily was in danger.

That was when the Order had learned the Potters were being hunted, when they had gone into hiding. That was why Dumbledore had trusted Severus with such unwavering conviction—why he had betted everything on him.

Sirius let out a short, breathless laugh, pressing the heels of his hands into his eyes. How had he not seen it before?

He had spent so long distrusting Severus, watching for the moment he would prove himself a traitor, that he had blinded himself to the truth that had been staring him in the face.

Severus hadn't just regretted passing along the prophecy. He had acted on that regret. He had gone to Dumbledore, had put his life at risk.

Sirius, when faced with guilt, had sought vengeance—and when that failed, he'd allowed himself to be locked away, dooming Harry to grow up without the family he deserved.

Severus, on the other hand, had risked everything to make amends.

He had hated James Potter, and Harry by extension, but he had protected him.

Severus might not have been kind, but he followed a strict moral code of his own—he was a man of duty, a man of principle.

Sirius wondered—if they hadn't made his life at school hell, if they hadn't taken Lily from him, if they hadn't driven him down the path of vengeance—would Severus have ever become a Death Eater at all?

And yet, when Severus had stood before him and revealed the truth, Sirius had done exactly what he had always accused Severus of.

He had chosen his own pain, his own grief, over the truth right in front of him.

"Would you still feel the same?"

It hadn't just been a test of his feelings.

It had been a test of whether Sirius could truly see him. Whether he could accept who Severus had become, instead of condemning him for the man he had once been.

And Sirius had failed.

Completely.

A bitter laugh escaped him, shaking his head.

Sirius had spent years thinking of himself as a prisoner of the past, but he had never stopped to consider that Severus might be one, too.

And perhaps, just perhaps, Severus had wanted him to be different. To see him differently.

But Sirius hadn't.

Not when it mattered.

And now… he wasn't sure he'd ever get the chance to make it right.

Sirius sat at the desk, his fingers tightening around the quill. He had rewritten the first few lines three times already, but the words still felt wrong. Too sharp, too impersonal.

But this wasn't about him—he reminded himself of that again.

Harry deserved the truth.

And Severus… Severus needed—what? Forgiveness? A way forward? Sirius didn't know. He only knew that after all these years, Severus was still bleeding from wounds that had never fully closed. And no matter how much Sirius wanted to resent him, he couldn't help but wish Severus wasn't hurting so much.

He exhaled, steadying his hand before pressing the quill to parchment once more.

Severus,

I won't betray your confidence. What you told me will stay between us.

But you should tell Harry the truth—the whole truth. He deserves to hear it from you, not secondhand through Dumbledore, not through anyone else. About the prophecy, yes, but more than that. About Lily. About why you turned spy, why you've risked your life over and over again.

I know you don't think it matters, but it does. And Harry — hesitantly, Sirius forced himself to put the words down — will understand. Maybe not immediately, but in time. He will be angry at first. Maybe more than angry. You and I both know how much James's blood runs through his veins. But he's also Lily's. And Lily…

Sirius paused, memories surfacing before he could stop them. Lily in the Gryffindor common room, arms crossed, feigning disapproval at James's antics but never quite hiding her amusement. The way she had never let her gaze linger when Severus was mentioned, but Sirius had noticed anyway. He had never thought much of it before, but now, he wondered.

She missed you, you know. She wouldn't say it outright, not in front of us, but I could tell.

That's why I know Harry will understand. Because he's her son.

Sirius debated for a long time before finally adding the last paragraph.

For the longest time, I thought I was the one who killed them. I still do, sometimes. Because I convinced them to switch. Because I should have been the one who died.

I won't insult you by trying to sympathize with you, but I do share the blame. Yet I wasted twelve years locked away, doing nothing, while you spent those same years fighting to make it right. Protecting Harry from the shadows.

I had no right to judge you.

Sirius wanted to write more—to apologize for his distrust, for how long it had taken him to see the truth.

But he didn't.

Don't make this all about you, he told himself.

He stared at the letter for a long moment, the words staring back at him like something foreign. Then, before he could talk himself out of it, he signed his name, folded the parchment and sealed it.

There was nothing left to do now but wait.

Severus didn't respond to the letter, not that Sirius expected him to. He didn't acknowledge that he had received it, and he acted as if nothing had changed.

But Sirius had learned how to watch people without them noticing. And when he was paying attention, he saw it. Subtle, almost imperceptible, but there.

When no one was watching, when Severus thought himself unobserved, he studied Harry.

Not during Order meetings—Harry still wasn't allowed in those—but in passing moments. When Severus arrived at Grimmauld Place for Occlumency lessons, when Harry walked past him in the corridor, when he spoke and Severus lingered half a second too long before turning away.

Sirius wondered what he was looking for.

Was he searching for Lily?

Trying to find her in the curve of Harry's jaw, the brightness of his eyes, the way he stubbornly held himself together even when he was barely holding on?

Did he see James instead? Was that why he never softened, why he still let bitterness slip through the cracks?

Or was he simply trying to reconcile the boy in front of him with the child he had once doomed?

Sirius didn't know.

And, perhaps, neither did Severus.