A/N: I did not mean for this chapter to take so long to get out! Really and truly. Life has kicked my ass lately and its been ROUGH! I've had lots of ideas for this chapter swiriling in my head for a bit, and I think I'm finally ready to get them all out into a nice long chapter for you all!

Chapter Five: Echoes

The library at Grimmauld Place had always been filled with ghosts. Not real ones, though given the house's history, Hermione wouldn't rule it out. There were echoes of things long gone, memories trapped in the heavy scent of old parchment and leather-bound tomes. Tonight, though, the ghosts felt louder, pressing in around her as she stared at the runes before her.

Her fingers traced the delicate lines inked onto the yellowed paper, her brow furrowing. They felt… familiar. Not in the way ancient texts often did after years of study, but in a way that made her stomach twist uncomfortably like she was trying to recall a word that had been on the tip of her tongue for days. She had been remembering things, strange, fragmented things that didn't quite make sense.

Like the mark on her right forearm.

Sirius had one too, in the same place. It wasn't a coincidence; she knew it wasn't. But when she had noticed it and asked him about it, he had deflected, brushing off her question before making a quick excuse to find James.

That alone told her it meant something.

She closed her eyes, pressing her fingertips against them. She tried to remember. She wanted to remember. She needed to remember.

Why did they have the same mark?

…*...*...*

"You're brilliant, Kitten. Never forget that."

Sirius' voice was low, reverent, but there was something else beneath it—something unspoken, something that made Hermione's stomach twist painfully.

She could feel his gaze on her as she paced the length of his small flat, her mind working through every possible loophole, every potential flaw in the plan. The dimly lit space smelled like leather and smoke, like ink-stained parchment and the remnants of spilled Firewhisky—scents she had come to associate with home. But soon, she wouldn't remember any of it.

She clenched her fists, steeling herself. This is the only way.

They had agonized for weeks about what would happen when time inevitably took her back. They had scoured books, debated every possibility, but there was no stopping it. She was going to be pulled back to the future, and when she did—she wouldn't remember this life. Wouldn't remember him.

And Sirius would be left behind.

The thought of it nearly broke her resolve, but she couldn't afford weakness. Not now.

"I'm not brilliant, Sirius," she said finally, turning to face him. "I'm just logical. The only way to make sure that nothing is revealed too soon is to make a Vow."

Sirius leaned against the kitchen counter, arms crossed tightly over his chest, his jaw clenched. The single candle between them flickered, throwing sharp shadows over his face. "You really think I'd just—what? Fall apart the second I see you again?" His voice was rough, edged with something wounded.

Hermione swallowed, stepping toward him. "I know you will." She held his gaze, unwavering. "You won't be able to stop yourself. You'll see me, and you'll tell me everything, and I won't believe you. I'll think you're insane, or worse—I'll push you away. And if that happens at the wrong moment, if it makes even one difference in the war—" She shook her head. "We could lose everything."

Sirius inhaled sharply through his nose, looking away. His hands flexed at his sides, like he was resisting the urge to reach for her. "And what if something happens and you never remember?" he muttered.

Hermione smiled sadly, placing a hand over his heart. "Then you'll tell me—when the war is over. When the time is right." She squeezed his shirt lightly. "You'll tell me everything, love. The good, the bad, all of it. I promise. But not before then."

Sirius closed his eyes, exhaling through his nose. She could feel the rise and fall of his breath, the barely contained tension in his body.

"I hate this," he murmured.

"I know."

"You're asking me to—" His voice broke, and he shook his head.

Hermione stepped closer, resting her forehead against his. "I'm asking you to love me enough to let me go," she whispered.

The silence between them was thick, suffocating. Sirius' hands ghosted over her arms as if he were committing the feel of her to memory as if letting her go now would be just as painful as losing her entirely.

Then, finally, he exhaled a shaky breath and stepped back.

"Fine," he said, his voice rough with resignation. "Call Regulus."

Hermione didn't hesitate. She lifted her wand, sending her Patronus soaring through the flat's open window. The silver otter vanished into the night, off to find Sirius' brother.

When she turned back to Sirius, he was watching her with something raw and desperate in his eyes—like a man memorizing his last few moments of happiness.

She stepped forward, pressing a lingering kiss to his jaw, breathing him in. "I love you," she whispered.

Sirius' fingers curled into the fabric of her sweater as if he wanted to hold her there forever.

And when Regulus arrived, the Vow was made.

The last thing Hermione remembered before the magic sealed their promise was the way Sirius' fingers trembled as they laced through hers. The way his voice caught as he whispered the words that would bind them.

The next time she saw him, she would not remember.

And he would have to pretend that none of this had ever happened.

…*...*...*

Her breath hitched. That voice—his voice—wrapped around her like a memory she didn't remember making. But the way he had said it, the warmth in it, the way it wasn't just Sirius' usual teasing lilt but something deeper, something raw—why did it hurt?

The scrape of the door opening made her jolt out of the memory that overtook her.

She looked up to find Sirius standing there, watching her with that careful, unreadable expression he wore when he thought no one was looking. He was good at hiding things, at tucking away his emotions behind charm and sharp wit. But tonight, he wasn't trying as hard. Whether he was tired, or tired of trying, Hermione wasn't sure.

"Alright, love?" His voice was softer than usual, rough around the edges like he'd been drinking or…

Or like he'd been remembering something, too.

Hermione let out a slow breath. "I don't know," she admitted, shaking her head. "I feel like I should know what this means. Like I do know, but I just can't reach it."

She motioned toward the notes spread out before her, the identical marks on their arms, and the heavy tension lingering between them. "And then I hear things," she paused and took a breath, "things I don't remember happening." She hesitated, then added softly, "Like you calling me Kitten."

Something flickered across his face, gone too quickly for her to name. "I call you all sorts of things, love."

Hermione gave him a pointed look. "Not that. Not before recently. You call me love, or bookworm," she rolled her eyes at that nickname, "But it doesn't feel new, Sirius. It feels…" She searched for the right word. "Stolen. Like it belongs to someone else, but somehow, it's mine too."

Sirius stepped into the room, settling in the chair across from her. His usual cocky ease was gone, replaced by something wary, something haunted.

"Memories are tricky things," he said carefully. "Especially in this house. You know how it is. History clings to everything here. It makes you feel things that aren't real. For all the Curse Breakers I've had through, there's still so much dark magic steeped into these walls. This place will never truly be right." He exhaled, running a hand through his hair. "Maybe you're just…" He gestured vaguely. "Picking up on the past."

Hermione let out a sharp breath, arms crossing over her chest. "You're deflecting. You always do that when you don't want to answer something."

His lips twitched, but it wasn't his usual smirk. It was strained, like he was trying to pretend her words didn't sting. "You're too clever for your own good, Kitten."

Hermione went still.

There it was again, that ache, deep and disorienting, like stepping into a place she should have known by heart only to find it unfamiliar. The way he said it was too natural, too instinctive, like a melody she used to hum but hadn't heard in years.

Like she had once been his world, and now he was forcing himself to let her be a stranger.

Sirius cleared his throat and leaned back in his chair, running a hand through his hair. "Maybe you should take a break from all this. It's late."

It was a dismissal.

Hermione clenched her fists in her lap, willing herself to stay calm. "Then why don't you let me leave, Sirius? Why do you give me these breadcrumbs knowing that giving me these little breadcrumbs won't make me want to give this up, not tonight." The words left her before she could stop them, frustration simmering just beneath the surface. That's what this felt like, like he was lingering in doorways, toeing the line between staying and going, saying just enough to keep her questioning but never enough to give her answers.

She wanted to scream. It was like he was playing a game, dangling the truth in front of her like a carrot, only to snatch it away at the last second. "You say you love me, you say you care," she thought, the lyrics of a muggle song echoing in her mind, "And then you shoot me down when I'm almost there." It was the push and pull that was driving her mad. One minute he was close, his eyes full of something she couldn't quite name, the next he was distant, a wall slamming down between them.

"You build me up, you butter me up," the song continued in her head, a perfect description of Sirius's behavior. He'd charm her with glimpses of his past, shared laughter, and a connection that felt deeper than anything she'd experienced before. He'd make her feel like she was finally getting somewhere, finally breaking through his carefully constructed barriers. But then… "You leave me hanging on a string," the lyrics finished, and the image of Sirius's retreating back filled her mind. He'd pull back, offer a cryptic smile, a vague apology, and leave her stranded, wanting more, needing more.

It was the uncertainty that was the worst. "Friends don't look at friends that way," the song insisted. But how did Sirius look at her? Was it friendship? Something more? Or was it just a cruel game he was playing, a way to pass the time, a distraction from his own demons? The thought stung more than she cared to admit. She was tired of the whispers, the half-truths, the feeling that she was always on the outside looking in. She wanted the whole story, the truth, no matter how painful it might be. And she wanted Sirius to stop treating her like some fragile ornament, to trust her enough to share his past, his pain, his everything. "Friends don't look at friends that way," she repeated in her mind, a plea and a challenge all rolled into one. She just wished she knew how Sirius looked at her.

But she wasn't ready to let this go. Not yet.

She glanced at the parchment again, at the scrawled translations and the notes in the margins, some of them in her own handwriting. A thought struck her, making her stomach tighten.

"Sirius," she said slowly, her voice barely above a whisper, "have I ever studied this before?"

His fingers twitched where they rested against the armrest.

For the briefest second, she swore she saw something break in his expression. Longing, grief, guilt.

"No," he said after a beat, too careful, too measured. "Not that I know of."

Liar.

Hermione swallowed the lump rising in her throat. Why are you lying to me?

She didn't say it aloud. Instead, she pushed to her feet, gathering the papers with slow, deliberate movements. "Right," she murmured, not meeting his gaze. "You're probably right. I should get some sleep."

She didn't look back as she left the library, but she felt his eyes on her the entire way.

…*...*...*

Sirius stayed behind, staring at the empty chair where she had just been.

He drained the last of his firewhisky and let the glass dangle loosely from his fingers, staring at the runes scattered across the table. Her handwriting mixed with his.

Old notes. Old promises. Old ghosts.

He ran a hand down his face and let out a low, shuddering breath. He stared at the mark on his arm, the same one he caught her staring at just minutes before. He stared at that mark and forced himself to remember.

Sirius watched her pace his flat, her brows drawn in deep concentration, lips pressed together as she worked through every possibility, every flaw in their plan. The flickering candlelight cast shadows across the room, illuminating the space that had, somehow, become theirs—smelling of old parchment, leather, and the lingering traces of her favorite tea. It was home.

But soon, she wouldn't remember any of it.

His throat was tight, his hands clenched at his sides. He didn't want this. He didn't want to forget what it felt like to have her curled up against him on the worn-out sofa, or the way she looked at him like he was worth something. But it didn't matter what he wanted.

She was leaving.

And when she came back, she wouldn't remember that she had ever been his.

"You're brilliant, Kitten. Never forget that," he murmured, forcing his voice to stay steady.

Hermione barely spared him a glance as she paced. "I'm not brilliant, Sirius," she corrected, voice firm. "I'm just logical." She stopped in front of him, lifting her chin, determined. "The only way to make sure nothing is revealed too soon is to make a Vow."

Sirius exhaled sharply, bracing himself against the counter. "You really think I'd just break the second I saw you again?"

She met his gaze, unyielding. "I know you will."

The words knocked the breath from his lungs. Because she was right. He would.

He'd spent weeks pretending they had more time, but the truth had always been lurking beneath it all. He couldn't stop this from happening any more than he could stop the sun from rising. And when she was gone, when she came back and looked at him with blank, unknowing eyes—he didn't know how he'd survive it.

His fingers twitched with the urge to reach for her, to hold on. But it wouldn't change anything.

"And what if you never remember?" His voice was rough, almost hoarse.

Hermione smiled softly, placing her hand over his heart. "Then you'll tell me—when the war is over, when the time is right." She squeezed the fabric of his shirt lightly. "You'll tell me everything, love. The good, the bad, all of it." A pause. "But not before then."

He let out a slow, unsteady breath, closing his eyes.

He wanted to be selfish. He wanted to refuse. But she was asking him to let her go—and Sirius had never been able to deny her anything since she unceremoniously fell into his flat all those months ago.

"I hate this," he muttered.

"I know."

"You're asking me to—" His voice cracked, and he shook his head.

"I'm asking you to love me enough to let me go."

His eyes burned. His chest ached. And yet, all he could do was nod.

"Fine," he said, forcing the word out, even as it tasted like ash on his tongue. "Call Regulus."

Hermione didn't hesitate, lifting her wand and sending her Patronus into the night. And Sirius, just stood there, watching her, memorizing her, because soon, she would be nothing but a ghost in his past.

She turned back to him, stepping forward, pressing a lingering kiss to his jaw. "I love you," she whispered.

Sirius' fingers curled into the fabric of her sweater, gripping her like a man desperate to hold onto something already slipping away.

And then Regulus arrived.

The Vow was made.

Sirius spoke the words, made the promise, felt the magic settle over him like chains. But all he could think about was the way her fingers trembled in his as the bond sealed.

She had been his. All of her.

And now—

Now, he had none of her at all.

He had always known this day would come. Had dreaded it. Had spent sleepless nights staring at the ceiling, agonizing over what he would do when it finally happened.

Merlin, he had hoped—hoped that maybe the past would stay buried, that she would never start looking for the cracks in her memories. That she would never tilt her head at the way he handed her a cup of tea exactly how she liked it. That she wouldn't pause when she saw him cooking eggs just the way she used to make them for him. That she wouldn't hesitate when he called her something other than Kitten—like she knew, deep down, that wasn't quite right.

But she was noticing.

And Sirius was unraveling.

James and Remus had a plan. They had been working on a way to extract the memories, to help her remember when the time was right. He wanted that. He wanted her back—wanted her to look at him the way she used to, to know him the way she once had.

But it wasn't time.

Not yet.

So he swallowed the words, buried the instincts that screamed at him to tell her everything, and forced himself to play the part. Forced himself to pretend that they had never been anything more than what she remembered.

And it was killing him.

Sirius rubbed a hand over his chest, pressing against the ache that had never really left.

Losing her once had nearly destroyed him.

Losing her again, losing her for good…

He didn't know if he would survive it.

…*...*...*

Hermione couldn't sleep.

She sat cross-legged on her bed, staring at the envelope on her nightstand. The room was dark except for the flickering glow of the candle she hadn't had the heart to blow out.

She reached for it, running her fingers over the edge.

Something crinkled.

Frowning, she turned it upside down, and a smaller slip of paper fluttered onto the mattress.

Her breath caught in her throat as she held it up to the candlelight.

The ink was faded but unmistakably hers.

"Trust him. He's always known the way home."

A chill ran down her spine.

She had written this. She knew she had. But when? And why did it feel like a message from a version of herself she couldn't quite remember?

She needed answers.

Heart pounding, she slid out of bed and crept down the dimly lit hall. She hesitated outside Sirius' closed door, her fingers hovering over the handle before she pressed her ear against the wood.

Faintly, she heard movement—the quiet clink of glass, the rustle of fabric, a heavy, weary sigh.

He was awake.

She lifted a hand to knock, but then—

"Hermione."

Her breath caught. His voice was barely more than a whisper, rough and raw, like he had been crying. Like he was saying her name just to hear it, as if it was something slipping through his fingers.

She clenched her jaw, her hand still poised to knock. But something stopped her.

They were friends. Weren't they?

Then why did this feel like standing on the edge of something vast and unknown, like crossing that threshold would mean stepping into something neither of them could come back from?

Slowly, she let her hand drop.

She would wait.

For now.

But the ghosts in this house weren't going to stay quiet forever.

And neither was she.