The two weeks passed the way time passes before something inevitable — both too fast and too slow, days that dragged until they didn't.
Mia trained every morning before the castle woke, in an empty classroom on the fourth floor that Bellatrix had quietly claimed for the purpose. An hour, sometimes two, running the sequences until they stopped being something she thought about and became something she simply did. The vanishing. The casting motion for the Vault. The particular stillness required to take a hit and not react.
That last one was the hardest.
"Again," Bellatrix said, from across the room.
The spell caught Mia across the forearm — blunt force, not a real slicing curse but close enough to sting sharply. She absorbed it, kept her expression neutral, didn't shift her weight.
"Better," Bellatrix said. "Though your jaw tightened."
"I'm aware."
"He'll be watching your jaw specifically. It's where most people break first."
Mia rolled her shoulder and reset her stance. "How do you know where he watches?"
"Because I've been his intended for three years," Bellatrix said flatly, "and he has spent a considerable amount of that time waiting for me to break." She raised her wand. "Again."
They didn't talk about it beyond the training. It was there underneath everything — in the way Bellatrix reviewed the Vault sequence with her every other evening, in the way Mia caught her sometimes just watching, assessing, running calculations she didn't share. In the way they were both sleeping badly and neither of them mentioned it.
The night before the duel Bellatrix came to find her in the library after dinner. She didn't bring scrolls or parchment. She just sat down across from Mia and looked at her until Mia closed her book.
"You're ready," Bellatrix said.
"I know."
"I'm not saying it to reassure you."
"I know that too." Mia looked at her across the table. "You wouldn't."
Something in Bellatrix's expression shifted — briefly, quietly. The thing underneath the composure that only came out in the dark or in empty rooms.
"After tomorrow," she said, and then stopped.
"After tomorrow," Mia agreed.
They didn't need the rest of the sentence. They'd been finishing each other's silences for months.
The duel took place on a Saturday morning in the east grounds, under a sky the colour of cold iron.
The witnesses were few and deliberate. Arcturus, seated in a conjured chair at the edge of the designated space, attended by two members of House Black whose names Mia didn't know and didn't need to. Cygnus Black stood beside his father, his face arranged in the careful neutrality of a man who had not yet decided which outcome served him best. Three Lestranges on the opposite side — Rodolphus's father, broad and grey-templed, and two others who had the family look.
Bellatrix stood at the edge of the circle.
She was not permitted to stand with Mia — the terms of the challenge required the claimant to enter the circle alone. She stood where Mia could see her without looking for her, and her face was composed and still and her eyes didn't move from Mia's face.
Mia looked back at her for exactly one second. Then she turned and walked into the circle.
Rodolphus was already there.
Up close, without the managed distance of the common room or the platform, he was more than she'd accounted for. Not just physically — he had the focused quality of someone who had been preparing for this since the moment Arcturus's letter arrived. His eyes moved over her once, assessing, and she saw the conclusion he reached: manageable. A girl playing at a man's game, in over her head, who would be put back in her place efficiently and without much effort.
Good, she thought. Stay there.
The officiating wizard — a Black family solicitor, ancient and expressionless — read the terms aloud in a carrying voice that the cold air took and scattered across the grounds. Single combat. Yield or incapacitation as conditions of victory. The dark marital contract, currently held in trust by House Black, to pass to the victor's keeping.
Rodolphus rolled his shoulders.
Mia stood still.
"Begin," the solicitor said.
He was fast. She'd known he would be — Bellatrix had told her, the scrolls had told her, and still the slicing curse came quicker than she'd fully prepared for, a sharp lateral movement of his wand and a flash of silver-grey light that crossed the distance between them in less than a second.
She took it on the left side, below the ribs.
Not deep — the angle wasn't right for deep, and she suspected he hadn't intended deep, not yet. A surface cut, clean and immediate, the kind that bled freely. She felt the warmth of it through her robes and kept her face still and her breathing even and did not, absolutely did not, let her jaw tighten.
She heard someone shift on the Lestrange side of the circle.
Rodolphus moved differently after that — looser, his shoulders dropping slightly, the particular ease of a man who had received the confirmation he wanted. He was smiling, just barely. Not at her. At the situation, at the foregone conclusion of it, at the entertainment of watching someone fail to understand what they'd walked into.
Good, she thought again. A little longer.
He cast twice more — both testing, probing, the spells of someone taking their time. She deflected both, deliberately just barely, giving him nothing but the impression of someone holding on and slipping. The blood was warm on her side. She ignored it.
On the Lestrange side someone murmured something approving.
She let herself look uncertain for one more second.
Then she moved.
The vanishing was wandless — a controlled, silent piece of magic that removed three feet of frozen ground directly beneath Rodolphus in the space between one breath and the next. No flash, no sound. Just the ground that had been there and then wasn't.
He dropped.
Not far — eighteen inches, maybe less — but unexpected, his balance shattered mid-motion, his wand arm pulling wide. The look on his face in that fraction of a second was worth everything. Pure shock. The complete disorientation of someone who had understood the terrain and then found it gone.
Mia cast.
The Black Vault wasn't a visible spell. That was its particular quality — what it did showed on the person it hit rather than in the air between them. Rodolphus went rigid, a sharp involuntary sound escaping him as his own magic turned against itself, the Vault beginning its slow, airless compression.
She watched him understand what it was.
She watched him understand where it had come from.
His eyes went past her to Bellatrix at the edge of the circle, and something moved through them — fury first, then something colder and more calculating. Then back to Mia.
"Yield," she said quietly. "Or don't. Either way the contract is mine."
She said it only for him. Not for the witnesses, not for the gallery. Just for Rodolphus, so he understood exactly what was happening and who was doing it.
The compression tightened.
His wand hand opened.
"I yield," he said. The words came out stripped down to their function, all the smoothness gone from his voice.
Mia held the Vault for exactly three more seconds. Then she released it cleanly and stepped back and lowered her wand.
The silence in the east grounds was remarkable.
The solicitor said something about the terms being satisfied. There was movement on both sides of the circle. Mia heard none of it. She was watching Rodolphus straighten, his composure returning piece by piece, his face rearranging itself around something controlled and cold.
He looked at her once more before he turned away.
It wasn't anger. It wasn't even humiliation, quite.
It was the look of a man putting something away for later.
She held his gaze until he looked away first.
The contract was a physical thing — a folded document in deep green and black, sealed with the Lestrange and Black family marks, pressed into her hands by the solicitor with the impersonal efficiency of someone transferring a deed. It was heavier than it looked. Old magic in the parchment, the kind that had been accumulating in a document for decades.
She held it and felt it pulse once against her palms, recognising the transfer.
Done.
She became aware of Bellatrix at her shoulder — not touching, not speaking, just there, a presence at the edge of her peripheral vision like a fixed point.
Arcturus was watching her from his chair. He said nothing. But his expression had shifted slightly from its baseline severity and she thought — she couldn't be certain, but she thought — that what had replaced it was something close to approval.
Cygnus Black looked at his eldest daughter for a long moment and then looked away.
The Lestranges were already leaving.
Bellatrix turned toward the castle without ceremony and Mia fell into step beside her, the contract in her hands, the cut on her side still bleeding slowly through her robes. They walked across the frozen grounds and didn't speak until the castle door closed behind them and the cold and the witnesses were both gone.
Then Bellatrix stopped in the entrance hall and turned to her.
She looked at the blood on Mia's robes. Then at her face. Her expression was doing several things at once — relief and fury and something quieter underneath both.
"You took too long after the drop," she said.
"I know. I wanted him to see it coming."
"That was a risk."
"It worked."
"It was still a risk." Her voice was sharp. She stepped forward and pushed Mia's robes aside without asking to look at the cut, her hands steady and clinical and contradicting the sharpness entirely. "It's not deep."
"I know. He wasn't trying for deep."
"Not yet." Bellatrix's hands stilled. She looked up. "He'll try for something else next."
"I know that too."
They looked at each other in the empty entrance hall, the castle quiet around them on a Saturday morning.
Mia held up the contract.
Bellatrix looked at it. Then she took it, slowly, turned it over in her hands, felt the weight of it the way Mia had. Her thumb moved across the Lestrange seal.
"It's done," she said.
"It's done," Mia confirmed.
Bellatrix looked at her for a long moment. Then she tucked the contract inside her robes, took Mia's hand, and turned toward the stairs.
"Come on," she said. "I have Dittany in my room."
Bellatrix's room in the Head Girl suite was a study in controlled chaos. Books and scrolls were stacked with a system only she understood on every surface, and the air smelled of ink, old leather, and the faint, sharp scent of her magic. She guided Mia to sit on the edge of the four-poster bed and knelt before her, her movements efficient.
She vanished the blood-soaked section of Mia’s robes with a silent spell, exposing the shallow cut along her ribs. The skin was parted cleanly, still seeping. Bellatrix uncorked a small vial of Dittany with her teeth, her focus absolute.
“This will sting,” she said, and tipped the potion.
The liquid hissed where it touched the wound. Mia’s breath caught, her muscles tightening. Bellatrix’s free hand came up to steady her hip, her thumb pressing into the bone. The touch was firm, grounding. She watched the flesh knit itself back together, leaving only a thin, pink line behind.
Her thumb didn’t move. She stared at the new scar, her breathing shallow. The clinical focus bled away, leaving something raw in its wake.
“He marked you,” Bellatrix whispered. Her voice was low, rough.
“It’s nothing.”
“It’s not nothing.” Bellatrix’s head bowed. She pressed her forehead against Mia’s stomach, just below the healed cut. Her dark curls spilled over Mia’s thighs. “He put his hands on you. His magic. I felt it.”
Mia’s hand came up, her fingers sinking into Bellatrix’s hair. “He’s gone. The contract is ours.”
Bellatrix turned her face, her cheek resting against Mia’s skin. Her breath was hot. “I know.” She said it like a vow. Then she looked up, her obsidian eyes gleaming. “Show me you’re here. Show me you’re whole.”
It wasn’t a request. It was a need, stark and open. Mia understood. The duel, the contract—it was a transaction. This was the reclamation.
She pulled Bellatrix up by her hair, not gently, and kissed her. It was deep and slow, a claiming of a different kind. Bellatrix melted into it with a shuddering sigh, her hands coming up to frame Mia’s face.
They undressed each other without haste. Robes pooled on the floor, then shirts, then everything else. The cold castle air raised gooseflesh on their skin, but where they touched, heat bloomed.
Bellatrix pushed her back onto the bed, following her down, covering her. The weight was familiar, anchoring. She kissed Mia’s throat, her collarbone, the space between her breasts. Her mouth was worshipful, her hands tracing every line as if re-mapping territory.
“You were brilliant,” Bellatrix murmured against her skin. “The way you moved. The Vault spell.” Her teeth grazed a nipple, and Mia arched off the bed. “I wanted to scream. I wanted to curse them all for watching.”
Mia tangled her hands in Bellatrix’s hair, guiding her mouth back to hers. “Just you,” she breathed into the kiss. “It was only ever for you.”
The weeks of tension, of public distance and private plotting, dissolved under the slide of skin on skin. This wasn’t the frantic heat of the library. This was slower, deeper, a deliberate unwinding.
Bellatrix’s hand slid down Mia’s stomach, her touch sure. When her fingers found her, Mia was already wet. Bellatrix made a soft, approving sound against her mouth. “All this,” she whispered, her fingers circling, not yet pressing inside. “All this for me.”
“Yes.”
Bellatrix entered her with one slow, inexorable push. Mia cried out, her back bowing. It was fullness, a sweet, aching stretch. Bellatrix stilled, letting her adjust, her forehead damp against Mia’s temple.
“Look at me,” Bellatrix breathed.
Mia opened her eyes. Bellatrix was watching her, her gaze fierce and tender all at once. She began to move, a slow, rolling rhythm that built a deep, coiling heat in Mia’s belly. Each thrust was a promise. Each withdrawal, a plea.
Mia’s heels dug into the mattress, her hips meeting every movement. The world narrowed to the place where they were joined, to the sound of their breathing, to the dark intensity of Bellatrix’s eyes holding hers. Pleasure built, not as a sudden crest, but as a rising tide, inevitable and overwhelming.
She felt the tension gather, tighten, a wire about to snap. Bellatrix felt it too. Her rhythm faltered, her own control fraying. “Come for me,” she commanded, her voice ragged. “Let me feel it.”
The orgasm broke through her, silent at first, a wave of pure sensation that stole her breath. Then a sob tore from her throat as it rolled on and on, pulling Bellatrix with her. Bellatrix’s movements became frantic, her own release hitting with a choked gasp, her body trembling violently against Mia’s.
They collapsed together, slick and spent. Bellatrix’s weight was a welcome anchor. She nuzzled into Mia’s neck, her breathing gradually slowing. Her magic, usually a crackling storm, hummed contentedly against Mia’s skin, a resonant, satisfied frequency.
After a long while, Bellatrix shifted, pulling out gently. She didn’t go far, just curled onto her side facing Mia, one hand possessively spanning her waist. The thin scar on Mia’s ribs was level with her eyes.
She traced it with a single fingertip. “He’ll try to kill you for this,” she said, the words matter-of-fact in the quiet room.
“I know.”
“We’ll kill him first.” Bellatrix’s gaze lifted to hers. There was no madness in it, only a cold, clear certainty. “Properly. Not in a sanctioned duel.”
Mia reached out, brushing a curl from Bellatrix’s damp forehead. “We will.”
Bellatrix caught her hand, pressed a kiss to her palm. The ferocity bled away, leaving exhaustion and a soft, vulnerable warmth in its place. “Christmas at Grimmauld,” she sighed, the words muffled against Mia’s skin. “Him. My parents. All the vultures.”
“We have the contract. They have to acknowledge it.”
“They’ll acknowledge it.” Bellatrix’s eyes drifted closed. “And then they’ll look for the weakness in it. In us.”
Mia watched her in the dim light. The fierce heiress, now soft and sated in her arms. The girl who would have been broken, now whole. “Let them look,” Mia whispered.
Bellatrix’s lips curved, just slightly. She was already slipping toward sleep. “They won’t find one.”
After they lay in the quiet of Bellatrix's room and the castle was still around them and the contract sat on the desk across the room, solid and real.
"Rodolphus will move against us," Bellatrix said to the ceiling.
"Yes."
"Not immediately. He'll be careful about how it looks. But he'll move."
"I know." Mia turned her head. "Let him."
Bellatrix looked at her.
"We've been preparing for Voldemort," Mia said. "Rodolphus Lestrange is not Voldemort."
"No," Bellatrix agreed. "He's smaller than that. Which sometimes makes him more dangerous."
"Smaller things can be handled more directly." Mia looked at the contract on the desk. "We won the first move. Now we plan the next one."
Bellatrix was quiet for a moment. Outside, wind moved through the grounds, rattling the old window in its frame.
"You bled on a Black family contract," she said.
"Technically I bled on your grandfather's frozen lawn first."
"The contract too." A pause. "There's old magic in that. Unintentional blood binding."
Mia looked at her. "Is that a problem?"
Bellatrix considered it with the serious expression she brought to things that mattered.
"No," she said finally. "I don't think it is."
She said it the way she said things when she'd already decided and just wanted to hear how it sounded out loud.
Mia looked back at the ceiling. Felt the ache in her side, the fading tension of weeks, the solid reality of where they were and what they'd just done.
"What's next," she said.
"Christmas," Bellatrix said. "My family. All of them together." A beat. "That will be its own kind of duel."
"I've handled your family before."
"Not all of them at once. At a Black family Christmas." She glanced sideways. "With Rodolphus also present, because my mother will insist on maintaining appearances until the legal situation is formally resolved."
Mia absorbed this. "Right."
"And my aunt Walburga."
A pause. "How bad."
"Considerable."
"Right," Mia said again.
Bellatrix almost smiled. "Still confident?"
Mia thought about a troll in a bathroom. About a basilisk she'd never seen. About camping in the rain for months and breaking into a bank on a dragon and crossing twenty-three years of time on a device she wasn't supposed to touch.
"Ask me something harder," she said.
Bellatrix looked at her for a moment. Then she did smile — that rare, real version, the one that changed her whole face.
"Get some sleep," she said. "We'll start planning in the morning."
Outside the wind moved through the castle grounds and the contract sat on the desk and somewhere below them Hogwarts went about its Saturday in complete ignorance of the fact that everything had just changed.