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2026-02-18
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2026-02-18
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Against Old Magic

Summary:

Fifteen years after the war, the wizarding world is unraveling in a way no one expected. Ancient blood magic is collapsing, tearing through pureblood estates and dragging old contracts back to life. Harry Potter is tasked with stopping it. Draco Malfoy is tied to it.

They have spent half their lives defining each other by the worst versions of themselves. Now they are forced to work side by side to dismantle a system Draco’s family helped build, and Harry helped defeat.

Old magic does not care about redemption. It only cares about what is owed. And somewhere between obligation and choice, hatred begins to fracture into something far more dangerous.

Chapter 1: Chapter 1

Chapter Text

The Ministry of Magic smelled like polish and anxiety, a scent Harry Potter had come to know as intimately as the worn leather of his own boots. Over the years, he had developed a theory that every institution accumulated its own atmosphere, a psychic residue of the emotions that permeated its walls. The Ministry’s was a complex cocktail of old parchment, stone cooled by centuries of bureaucracy, and the faint metallic tang of people who had too much to lose. Harry moved through the grand atrium with the practiced ease of someone who had been watched his entire life and had learned, through painful necessity, to ignore it. His boots struck the marble floor in a measured rhythm, a sound that was uniquely his own amidst the symphony of shuffling feet and murmured conversations. Witches and wizards parted just slightly without appearing to do so, a subtle dance of deference and fear that had once chafed but now felt like a second skin. He no longer noticed the glances directly, not the way he once had as a teenager bristling under the weight of a prophecy he never asked for. But he felt the shift in the air when he passed, the way conversations hushed for a half-second before resuming at a lower pitch. He had stopped being surprised by it. He had stopped wanting it to stop, which was perhaps the most worrying development of all.

He did not expect to see Draco Malfoy standing at the foot of the golden fountain, and the sight of him stopped Harry in his tracks more effectively than any magical barrier. Malfoy stood with his hands clasped loosely behind his back, his posture immaculate, his head inclined as if he were studying the cascading water with academic interest rather than simply waiting. He wore dark robes of a severe cut, tailored sharply at the shoulders and waist, not ostentatious in any way but unmistakably expensive in their quiet perfection. His hair was still the pale gold that caught the light too easily, a color that had haunted Harry’s peripheral vision for years, but the style was different. It was longer than he wore it at school, but styled with a control that spoke of deliberate effort, of a man who understood the power of presentation. There was more control in his stance than Harry remembered, a deliberate stillness that contrasted sharply with the restless energy of their youth, and less arrogance in the set of his mouth, replaced by something more neutral, more carefully constructed. But the sight of him still tightened something low in Harry’s chest, a knot of old animosity and something else he refused to name, something that had nothing to do with nostalgia and everything to do with the complicated history that bound them like invisible chains.

Malfoy did not look up immediately, which irritated Harry more than it should have. It was a small power play, a deliberate refusal to acknowledge Harry’s presence until he was ready, and it was a tactic so familiar, so reminiscent of the boy he once was, that it made Harry’s jaw clench. When he finally did lift his gaze, it was with the faintest narrowing of his eyes, as if he had sensed Harry’s approach before seeing him, a predator’s instinct that had only sharpened with age. The expression that crossed his face was not surprise. It was recognition layered over calculation, followed by something that might have been resignation, as if he had known this moment was coming and had already resigned himself to facing it.

“Potter,” Malfoy said, his voice smooth and level, the familiar drawl tempered by years of professional practice, stripped of its adolescent sneer but retaining its distinctive, aristocratic cadence.

Harry stopped three feet away from him, a distance that was both formal and pointed, and did not offer a smile. “Malfoy.”

The air between them felt older than the building, thick with the weight of unspoken words and unresolved history. It was a palpable presence, a third entity in their conversation that demanded to be acknowledged even as they both pretended it did not exist. They had not stood this close in years, not without the buffer of a formal proceeding or the polite fiction of a Ministry function. Public hearings did not count. Ministry galas did not count. That kind of proximity was curated, staged, surrounded by polite applause and strategic alliances, a performance for the benefit of others. This was different. This was direct, unbuffered, stripped of audience and obligation, and it felt dangerous in a way that wands and curses never had.

“I assume you’re here for the same reason I am,” Malfoy said after a moment, glancing toward the golden lifts that would carry them to the upper levels of the Ministry, where the important decisions were made and the difficult truths were buried under layers of paperwork and protocol.

Harry’s jaw tightened, a familiar reflex whenever Malfoy spoke, a remnant of a boyhood spent in constant opposition. “I was told there was a task force forming.”

Malfoy’s gaze flicked back to him, and there was something in it that Harry could not immediately place. It was not smugness. It was not fear. It was something steadier, something almost weary, the look of a man who had seen too much and had learned to expect the worst. “Yes,” Malfoy said. “There is.”

They rode the lift in silence, the small space amplifying the tension that hummed between them. The Ministry’s enchanted notices clanged as they descended, announcing departments and names and procedures in cheerful tones that felt wildly inappropriate given the gravity of the situation and the weight of their shared history. Harry was acutely aware of Malfoy’s shoulder a foot away from his own, of the faint scent of something clean and restrained, not cologne exactly but something sharper, perhaps potion residue or the subtle fragrance of expensive soap. He did not like how aware he was, how his senses seemed to sharpen in Malfoy’s presence, attuned to his every movement and breath. He stared at the doors, willing them to open, to release him from the suffocating proximity of a man he had once sworn to hate forever.

When the lift doors opened onto the Department of Magical Law Enforcement, Harry stepped out first, eager to put some distance between them, to reclaim the familiar territory of his own domain. The DMLE was his world, a place of order and purpose, a place where he knew the rules and understood the stakes. The conference room had already begun to fill, a gathering of the Ministry’s finest and most formidable, all drawn together by the same dark cloud that had brought Harry and Malfoy to this uneasy truce. Hermione sat near the head of the long oak table, parchment spread in meticulous order before her, her brow furrowed in concentration as she reviewed the case files. Ron stood near the back wall speaking quietly to another Auror, his arms crossed, his expression guarded and suspicious, a look he had perfected during their years chasing down Dark wizards. Several representatives from the Wizengamot were present, their faces grave and serious, along with two Unspeakables who remained as inscrutable as ever, their faces shadowed by deep hoods that seemed to absorb the light around them.

Hermione looked up as Harry entered and offered him a brief nod, her eyes flicking past him almost immediately. The nod tightened, became something more careful, something that acknowledged the presence behind him without quite naming it. Harry knew that look. It was the look she gave him when she was about to ask him to do something he would not like, something that would test the limits of his patience and his principles.

Malfoy entered behind him, and the shift in the room was subtle but unmistakable. The temperature seemed to drop by a few degrees, the cheerful hum of conversation fading into a tense silence. Ron’s mouth pressed into a thin line, his jaw tightening as he caught sight of Malfoy, his hand instinctively moving toward the wand holstered at his side. One of the Wizengamot witches adjusted her spectacles, her eyes narrowing with disapproval. The Unspeakables did not move at all, but Harry could feel their attention shift, their focus sharpening as they assessed the new arrival.

Hermione straightened, her expression becoming more formal, more public. “Thank you for coming,” she said, her voice measured and calm, the voice of a woman who had learned to command a room through sheer force of intellect and will. “We can begin.”

Harry took a seat on one side of the table, choosing a chair with a clear view of the door and a solid wall at his back. Malfoy chose the chair directly opposite him, a move that was both deliberate and provocative, a declaration that he would not be intimidated or marginalized.

Of course he did.

Hermione began outlining the situation, her voice steady and precise as she laid out the facts of the case. Over the past three weeks, three ancient estates had experienced catastrophic magical destabilization. Wards that had stood for centuries had failed without warning. Vaults had emptied themselves, their contents vanishing into thin air. Generational charms tied to bloodlines had collapsed as if the magic itself had rejected them, the very foundations of these families’ power crumbling into dust. There was no sign of external attack. No Dark Mark. No traceable curse. The magic appeared to be turning inward, consuming itself in a frenzy of self-destruction.

“The common denominator,” Hermione said carefully, her gaze moving around the table, pausing briefly on Malfoy, “is that each of these estates was bound by what records refer to as pre-Ministry Compact magic.”

Harry frowned, his mind already racing, piecing together the fragments of information into a coherent picture. “Blood contracts.”

Hermione inclined her head. “Yes. Old blood contracts, predating even the formalization of the Wizengamot, a system of magical enforcement that operated outside the jurisdiction of the Ministry for centuries.”

Ron shifted his weight, his expression troubled. “Meaning what, exactly? What does that mean for us now?”

Hermione’s gaze moved, briefly, to Malfoy, a silent invitation for him to explain, to offer his expertise on a subject that few in the room truly understood.

“Meaning,” Malfoy said, his voice cool but steady, “that certain families bound themselves to generational magical agreements to preserve lineage, property, and influence. These contracts were not just legal documents; they were living spells, woven into the very fabric of their magic, passed down from parent to child. If those agreements are destabilized, the magic does not simply vanish. It reacts.”

Harry’s eyes sharpened, his attention focused entirely on Malfoy, on the calm, measured way he spoke of such dangerous and arcane matters. “React how?”

Malfoy met his gaze directly, his eyes a clear, steady gray that held no hint of evasion. “Violently.”

There was no flourish in the word. No drama. Just fact, stated with the chilling certainty of a man who had studied the subject in depth, who understood its terrible implications.

“And you know this because,” Harry said evenly, his voice tight with a barely suppressed anger, “your family was one of the architects.”

The silence that followed was not comfortable. It was a heavy, suffocating thing, filled with the ghosts of the past and the weight of unspoken accusations. Ron’s hand tightened on the back of the chair in front of him, his knuckles white. The Wizengamot representatives exchanged uneasy glances.

Malfoy did not look away, his gaze unwavering, his composure unshaken. “Yes,” he said, the word a quiet admission of a truth he could not deny, a legacy he could not escape.

Harry felt a flicker of something that he refused to name, a grudging respect for Malfoy’s refusal to flinch, to make excuses or offer justifications. He leaned back in his chair, his posture deliberately casual, a mask for the turmoil that churned within him. “So let me understand this. Old pureblood families created a magical system designed to entrench themselves in power, to preserve their wealth and influence at the expense of everyone else. That system is now collapsing, and we’re supposed to treat it like a tragedy.”

Hermione’s eyes flashed warningly, a silent plea for him to temper his words, to remember the delicate nature of the situation, but Malfoy answered before she could intervene, his voice quiet but firm.

“No,” Malfoy said quietly. “You are supposed to treat it like a bomb that does not care who it kills.”

The words landed heavier than Harry expected, striking a chord of truth that resonated deep within him. He had seen enough of the Dark Arts, enough of the destructive power of magic, to know that Malfoy was right. This was not a simple matter of justice or revenge. It was a matter of survival.

Hermione cleared her throat, reclaiming control of the conversation. “This is not about preserving blood supremacy. It is about preventing magical infrastructure from tearing itself apart. If these contracts unravel unchecked, the backlash could spread.”

“To who,” Ron asked, his voice rough with concern.

“To anyone tied to the magical inheritance web,” Hermione replied. “Which is nearly everyone.”

Harry exhaled slowly, the weight of her words settling over him like a shroud. He hated when she was right before he had fully processed it, when she laid out the cold, hard facts of a situation he wanted to simplify, to reduce to a battle between good and evil.

“So what do we do,” he asked, his voice resigned, the fight draining out of him.

Hermione folded her hands on the table in front of her, her expression serious. “We need someone who understands the original structure of the Compact magic, someone who can decipher its language and anticipate its movements.”

Harry did not break eye contact with Malfoy, his gaze challenging, demanding. “And you think that’s him.”

“I know it is,” Hermione said, her voice leaving no room for argument.

Malfoy’s expression did not change, but something in his shoulders shifted, just slightly, a subtle relaxation of tension, a quiet acknowledgment of his role in this unfolding drama.

Harry felt a familiar, stubborn resistance rise in his chest. He did not trust Malfoy’s knowledge. He did not trust his motives. He did not trust that fifteen years could erase seventeen years of hatred, of rivalry, of pain.

“You want him on my task force,” Harry said, the words tasting like ash in his mouth, a bitter pill he knew he had to swallow.

“Yes,” Hermione replied. “I do.”

The words felt like a concession Harry had not agreed to make, a surrender to a reality he did not want to accept.

“Fine,” he said at last, his voice flat, devoid of emotion. “But he answers to me.”

Malfoy’s mouth curved faintly, not quite a smile, but a ghost of one, a fleeting expression of amusement that was gone as quickly as it appeared. “I would expect nothing less.”

The meeting dissolved into logistics, assignments, and preliminary investigations. Harry listened, contributed, calculated, his mind working furiously as he tried to anticipate the next move, the next threat. He did not look at Malfoy again until the others began to file out, their footsteps echoing in the sudden silence of the room.

When the room had thinned to just the two of them and Hermione gathering her parchment, Harry stood, his movements stiff and deliberate.

“I don’t know what you’re playing at,” he said quietly, his voice low and intense, a private warning meant for Malfoy’s ears alone.

Malfoy rose as well, smoothing a hand over the front of his robes, a gesture of composure that was almost reflexive. “I’m not playing.”

Harry stepped closer, the space between them shrinking until he could see the fine lines around Malfoy’s eyes, the subtle signs of stress that belied his calm exterior. “You don’t get to pretend your family’s history is just academic.”

Malfoy’s eyes cooled, the warmth of moments before replaced by a familiar chill. “And you don’t get to pretend the world is divided into villains and saviors. Not anymore.”

The words struck closer than Harry liked, hitting a nerve he had long tried to protect, a vulnerability he had carefully concealed behind a mask of certainty and purpose.

Hermione paused at the doorway but did not intervene, her presence a silent acknowledgment of the private battle being waged in the confines of the conference room.

“This is my case,” Harry said, his voice a low growl of possession and defiance.

“And this is my inheritance,” Malfoy replied, his voice equally firm, equally certain. “You want it dismantled safely, you need me.”

There was no arrogance in the statement. Only certainty, a calm assurance of his own value, his own necessity.

Harry held his gaze for a long moment, searching for the boy who had once sneered across classroom aisles, the boy who had lowered his wand in a bathroom and nearly died for it. He did not find him. He found something else instead. Something older. Something carved down by years of consequences, by the weight of a name he had never chosen but could never escape.

“I don’t trust you,” Harry said, the words a final admission of the truth that lay between them, a truth that could not be denied or ignored.

Malfoy’s expression did not waver, his gaze steady and unflinching. “I know.”

It was the simplicity of the response that unsettled him, the quiet acceptance of his distrust, the lack of protest or defense.

They left the room separately, the silence between them a heavy, suffocating thing, a barrier that seemed to grow more solid with each passing moment.

The first field inspection took place two days later at the remains of the Greengrass estate, a place that had once been a symbol of wealth and influence, now reduced to a haunting ruin. The manor stood like a wounded animal on the edge of Wiltshire, its once intricate wards flickering faintly against the pale afternoon sky, a dying ember of a once-great fire. Portions of the outer stone had cracked under magical stress, spiderweb fractures creeping across the façade like veins on a withered leaf. The air hummed faintly, as if the land itself were holding its breath, waiting for the final, inevitable collapse.

Harry Apparated at the edge of the property with two Aurors at his side, their wands drawn, their expressions grim and determined. Malfoy arrived moments later, alone, his appearance as immaculate as ever, a stark contrast to the devastation that surrounded them.

Harry watched him approach through the thinning mist, his movements fluid and confident, a man in his element despite the chaos. There was no hesitation in his stride. No visible fear.

“Stay behind the perimeter until we assess the ward stability,” Harry instructed the Aurors, his voice sharp and authoritative, the voice of a commander who knew the risks and was prepared to face them.

Malfoy stepped past them, ignoring Harry’s command, his gaze fixed on the wounded manor, his expression one of intense concentration.

Harry caught his arm, his fingers closing around the expensive fabric of his robes, the contact immediate and electric in a way that had nothing to do with magic. It was a jolt of awareness, a spark of connection that was both unwelcome and undeniable.

“Perimeter,” Harry said tightly, his grip firm, a warning he hoped Malfoy would heed.

Malfoy looked down at Harry’s hand on his sleeve before lifting his gaze, his eyes clear and steady. “If you want to understand the breach, you need to feel where it began.”

“I’m not risking—”

“You are not risking anything,” Malfoy cut in, his voice sharper now, a flash of the old arrogance, the old defiance. “You are assessing. That is the difference between us.”

Harry’s grip tightened unconsciously, his anger rising, a familiar response to Malfoy’s provocation.

For a heartbeat, neither of them moved, locked in a battle of wills, a silent struggle for dominance that was as old as their rivalry.

Then Harry released him, his fingers reluctantly loosening their hold, the loss of contact leaving a strange emptiness in its wake.

“Five minutes,” he said, his voice rough, a concession he knew he would regret. “If the wards spike, you step back.”

Malfoy inclined his head once, a gesture of acknowledgment, and crossed the invisible threshold, his steps deliberate and sure.

The air shifted the moment he did, the magical energy of the place responding to his presence, a recognition that was both fascinating and terrifying.

Harry felt it along his skin, a prickle that raised the fine hairs along his arms, a sensation that was both painful and exhilarating. The ward remnants pulsed faintly, responding to Malfoy’s presence. Not aggressively. Recognitively.

Malfoy closed his eyes briefly, extending one hand toward the fractured stone. His fingers hovered just above the surface without touching, a gesture of communion, of communication with the dying magic of the place.

Harry watched, unwillingly captivated, his anger forgotten in the face of such raw, untamed power.

The wards flickered brighter, then dimmed, a steady rhythm like a failing heartbeat.

“It isn’t an attack,” Malfoy murmured, more to himself than anyone else, his voice low and resonant, a sound that seemed to blend with the hum of the dying magic. “It’s a recall.”

“A recall of what,” Harry asked, his voice barely a whisper, afraid to break the spell that seemed to hold them both captive.

Malfoy opened his eyes, his gaze distant, unfocused. “Of obligation.”

The word seemed to settle into the air between them, a heavy, oppressive thing, a truth that explained everything and nothing at all.

Harry stepped closer despite himself, drawn by the intensity of Malfoy’s focus, by the sheer power of the moment. “Explain.”

Malfoy lowered his hand, the connection broken, the spell fading. “The Compact magic was designed to bind lineage to power. If a family violated its core tenets, the magic would retract privileges. Property. Vault access. In extreme cases, magical reinforcement.”

“And you’re saying that’s what this is,” Harry said, his mind racing, the pieces falling into place with a horrifying clarity.

“I’m saying someone has triggered the violation clause,” Malfoy replied, his voice calm, matter-of-fact.

Harry studied the fractures along the stone, the way the cracks curved inward rather than outward, a pattern that spoke of implosion rather than explosion. “And what constitutes a violation.”

Malfoy’s gaze flicked briefly to him, a flicker of something unreadable in his eyes. “Reform.”

The word landed with weight, a heavy, crushing truth that explained the targeting, the pattern, the very nature of the attack.

“You’re joking,” Harry said, his voice incredulous, a denial of a reality he did not want to accept.

“I rarely do,” Malfoy replied, his voice dry, a ghost of the old sarcasm that had once defined their interactions.

Harry felt the pieces align with a cold sort of clarity. Families that had publicly supported bloodline reform legislation. Families that had renounced generational supremacy clauses. Families attempting to dismantle the very system that had once protected them. The magic was retaliating, a desperate, dying lashing out at those who would betray its ancient purpose.

“Then why isn’t your manor in ruins,” Harry asked quietly, his voice low, a question he had to ask, a truth he had to confront.

Malfoy’s expression tightened just slightly, a flicker of vulnerability in his otherwise composed demeanor. “Because I have not formally severed my family’s binding.”

The implication hung there, heavy and unspoken, a confession of sorts, an admission of his own complicity in the system he claimed to oppose.

Harry looked at him differently then. Not softer. Not kinder. Just differently, with a new understanding of the complexities of his situation, of the impossible choices he faced.

“You’re still tied to it,” he said, not as an accusation, but as a statement of fact.

“Yes.”

“And you plan to break it.”

“Yes.”

Harry exhaled slowly, the weight of Malfoy’s confession settling over him, a burden he could not ignore. “That would make you the next target.”

Malfoy held his gaze without flinching, his courage in the face of such a threat both admirable and infuriating. “I am aware.”

For a moment, the hostility between them felt less like fire and more like friction, heat generated by proximity rather than hatred, a tension that was as dangerous as it was compelling.

“You should have told us,” Harry said, his voice rough with a concern he did not want to feel.

“You would have accused me of manipulation,” Malfoy replied, his voice equally rough, a shared moment of vulnerability that was as unexpected as it was unsettling.

Harry did not deny it, could not deny it, knowing that Malfoy was right, that his own prejudice would have blinded him to the truth.

A tremor rippled through the remaining wards, stronger this time, a violent shudder that shook the very foundations of the manor. The air shimmered, the magical energy coalescing into a visible wave of force.

“Back,” Harry snapped, his Auror training kicking in, his instincts screaming at him to get Malfoy to safety.

Malfoy stepped away instantly, crossing the threshold just as the fractured stone pulsed once, twice, then stilled, the last of its energy spent.

Silence settled over the estate, a heavy, oppressive thing that was more unnerving than the chaos that had preceded it.

Harry’s heart was beating faster than he cared to admit, the adrenaline of the moment still coursing through his veins, a potent cocktail of fear and excitement.

“You were right,” he said reluctantly, the words a concession he knew he had to make, a recognition of Malfoy’s expertise, of his value to the investigation.

Malfoy brushed invisible dust from his sleeve, a gesture of composure that was almost reflexive. “Yes.”

Harry almost smiled despite himself, then stopped, the old habits of rivalry too ingrained to be easily overcome. “Don’t.”

Malfoy’s lips curved faintly, a genuine smile this time, a fleeting expression of amusement that was gone as quickly as it appeared. “I wasn’t.”

They stood side by side at the edge of the property, staring at the wounded manor, a shared moment of quiet contemplation that felt more intimate than any conversation they had ever had.

“This isn’t about revenge,” Harry said after a long moment, his voice thoughtful, a realization that had been slowly dawning on him, a truth he could no longer deny.

“No,” Malfoy agreed, his voice equally thoughtful. “It’s about correction.”

Harry glanced at him, his curiosity piqued by the word, by the implications it held. “Correction implies design.”

Malfoy met his gaze, his eyes clear and steady, a shared understanding passing between them, a recognition of the true nature of the threat they faced. “It was always designed.”

The sun dipped lower, casting long shadows across the cracked stone, the light fading as the day drew to a close, a metaphor for the fading light of the old world, the old order.

Harry realized then that this case would not be solved with brute force or simple arrests. It would require understanding a system that had shaped generations, including the man standing beside him, a man he was beginning to see in a new light, a man he was beginning to understand.

He did not like needing Malfoy.

He liked even less that Malfoy knew it.

“We regroup at the Ministry tomorrow,” Harry said finally, his voice professional, a return to the formalities of their working relationship. “Bring whatever records you have on the original Compact drafting.”

Malfoy nodded, his expression serious once more. “I will.”

Harry turned to Apparate, then paused, a thought occurring to him, a concern he could not ignore.

“Malfoy.”

“Yes.”

“If this thing comes for you,” Harry said carefully, his voice low, a warning and a promise in equal measure, “you don’t handle it alone.”

For the first time since the atrium, something unguarded flickered across Malfoy’s face, a flash of surprise, of vulnerability, of something that looked suspiciously like gratitude. It was gone almost immediately, replaced by the familiar composure, the carefully constructed mask that hid the man beneath.

“I won’t,” he said, his voice quiet, a promise Harry wanted to believe but could not quite trust.

Harry did not trust the answer, could not trust the easy assurance, the calm acceptance of a danger he could not fully comprehend.

He Disapparated before he could examine why, before he could acknowledge the fear that coiled in his gut, a fear not for himself, but for the man he had once sworn to hate.

The wind moved through the cracked wards of the Greengrass estate, carrying with it the faint echo of magic older than either of them, older than their hatred, older than the war that had defined them both. Somewhere beneath the fractures and failing stone, something waited. Not malicious. Not merciful. Simply inevitable.

And for the first time since the task force had formed, the distance between Harry Potter and Draco Malfoy felt less like a chasm and more like a fault line.

It had not broken yet.

But it would.