The day of the gathering Bellatrix was composed in the specific way that meant she was working to be composed, which Mia had learned to read like weather.
She was fine at breakfast. Fine through the morning. Fine in the library after lunch, sitting across from Mia with her notes spread between them, annotating something in red ink with the focused precision she brought to everything.
Then she made a small mistake in her annotation, crossed it out, and put her quill down.
"Hey," Mia said.
"I'm fine."
"I know. Come here."
Bellatrix looked at her across the table with the expression of someone who was going to say something dismissive and then didn't. She stood up and came around the table and Mia pushed her chair back and Bellatrix sat on the edge of the desk and looked down at her and some of the careful composure went out of her shoulders.
"It's tonight," she said.
"I know."
"I've prepared for it."
"I know that too." Mia reached up and took her hand. "You're allowed to be unsettled by it. That's not a weakness. That's sense."
Bellatrix was quiet for a moment. "I keep thinking about what you said. That he has a quality. A way of making the room feel like he's the only thing in it."
"He does."
"I need to know if I can hold against that." She looked at their hands. "I've been certain about it but certainty in theory and certainty in a room with him are different things."
"Yes," Mia said honestly. "They are."
"That's not reassuring."
"You didn't ask to be reassured. You asked me not to lie to you." She stood up, which brought her close enough that Bellatrix had to look at her directly. "You're the most strong-willed person I've ever met. And I've met some significant competition." She held her gaze. "He'll try to fill the room. You've been the most interesting thing in every room you've walked into since you were old enough to walk into rooms. Hold onto that."
Something shifted in Bellatrix's expression. The tension didn't vanish entirely but it settled differently — like weight redistributed rather than removed.
"You're rather good at that," she said.
"At what."
"Saying the thing that's actually true instead of the thing that sounds nice."
"I learned from someone," Mia said.
Bellatrix looked at her for a moment. Then she leaned down and kissed her — slow and deliberate, one hand coming up to Mia's jaw, nothing rushed about it. Not desperate. Something more grounded than that. Like making sure of something before walking into uncertain territory.
Mia kissed her back and brought both hands up into her hair and felt the slight tension in her ease by degrees.
When they broke apart Bellatrix rested her forehead against Mia's.
"I'll be back by one," she said.
"I'll be awake."
"You should sleep."
"I'll be awake," Mia said again, and Bellatrix made a quiet sound that was almost exasperated and entirely fond and kissed her once more, briefer this time, before stepping back and picking up her quill.
She left at nine.
Mia watched her go from the common room — dark robes, hair down, composed and contained and beautiful and walking into something that had destroyed her in another life.
Avery was sitting two chairs away. He didn't comment. He just looked at the door after it closed and then back at his book, and the fact that he said nothing felt like its own kind of solidarity.
Mia lasted until midnight before giving up entirely on the pretence of reading.
She sat by the fire with her notes and read the same paragraph four times and then put the notes away and sat with just the fire. The common room had emptied. The castle was quiet. The clock on the mantle ticked with tremendous indifference to her state of mind.
At twelve forty-seven the portrait hole opened.
Bellatrix came through it and closed it behind her and stood in the empty common room and for a moment just stood there, and Mia got up and crossed the room and Bellatrix turned and looked at her.
She was fine. Whole, unhurt, herself. But there was something around her eyes — not trauma, not damage, something more like the look of someone who had been in a very loud place and the silence afterward felt strange.
"Sit down," Mia said.
"I'm fine."
"I know. Sit down anyway."
They sat on the hearthrug in front of the fire, close enough that their shoulders touched, and Bellatrix looked at the flames and said nothing for a moment, and Mia let her have the moment.
"He's extraordinary," Bellatrix said finally. "Not in the way I expected. Not loud. He's — very still. Very focused." She paused. "The room did exactly what you said. Everything narrowed to him."
"But."
"But I knew it was happening." She turned to look at Mia. "Knowing it was the difference. Every time I felt it pulling I thought about—" She stopped.
"About what."
"About you," she said simply. "About the vault and the ring and the list and this—" She gestured between them, the fire, the room, the whole of it. "Everything we're building. Every time the room tried to narrow I made it wider in my head."
Mia felt something loosen in her chest that had been tight since nine o'clock. "Did it work."
"I'm here aren't I." Said with the ghost of her usual dryness, which meant she was coming back to herself. "He spoke to me specifically. Said the Black name was one he had great respect for. Said he hoped to know me better." She looked back at the fire. "He's very good at making you feel chosen."
"That's the point."
"I know. It didn't work." Her jaw tightened. "What was interesting was who was there. Rosier, obviously. Mulciber. Three from Ravenclaw that I didn't expect. And Rookwood — he's Ministry, Crouch's office."
Mia stared at her. "Rookwood is in Crouch's office."
"Which is where our genealogy records clerk came from." Bellatrix looked at her. "Not a coincidence."
"Rodolphus gave Voldemort our names before he gave Voldemort our names," Mia said slowly.
"He's been reporting to him. Possibly since the duel." Bellatrix's voice was even. "Which means anything Rodolphus knows or suspects about us, Voldemort knows or suspects."
The fire crackled. The clock ticked.
"He looked at me," Bellatrix said, quietly. "Voldemort. At the end, when people were leaving. He looked at me specifically and he said — I'll be seeing more of you, Miss Black. That was all."
"He's marking you."
"He's marking me as a future acquisition. Which is what I wanted — I wanted to be an asset in his mind, not a problem." She paused. "But it's not comfortable."
"No," Mia agreed. "It won't be."
Bellatrix was quiet for a moment. Then she turned to look at Mia properly and the last of the tension around her eyes finally broke. She looked tired and sharp and entirely herself and the relief of it hit Mia all over again.
"I told you I'd come back whole," she said.
"You did."
"Then stop looking at me like that."
"Like what."
"Like you've been sitting by this fire since midnight terrified." She reached over and pushed a curl out of Mia's face with two fingers. "I told you to sleep."
"And I told you I'd be awake." Mia caught her hand before she could take it back and held it. "You were in a room with Voldemort."
"And I came home." Said quietly. Home. Like the word had settled into the sentence naturally, without either of them deciding it should be there.
Mia looked at her.
Bellatrix looked back, and clearly heard what she'd said, and didn't take it back.
"You came home," Mia said.
"I came home," Bellatrix agreed.
The fire was warm and the castle was quiet and they were both still sitting on the hearthrug and Bellatrix was watching her with that expression — the private, unguarded one, the one that only existed in empty rooms — and Mia closed the small distance between them and kissed her.
Not careful. Not brief. Bellatrix made a low sound and kissed her back and her hands came up into Mia's hair and they stayed like that while the fire burned and the clock on the mantle quietly registered the hour and nobody was watching.
When they finally broke apart they were both slightly breathless and Bellatrix's hair was considerably more dishevelled than it had been and she was looking at Mia with dark eyes and the particular expression that meant thinking had largely been suspended in favour of something more immediate.
"The dormitory is empty," Mia said. "Everyone else went to bed hours ago."
Bellatrix glanced at the stairs. Back at Mia. "Everyone."
"I checked."
"Of course you checked." She stood up in one fluid motion and pulled Mia up after her by their joined hands, and her mouth curved into that rare full smile, warm and a little wicked. "Come on then."
The warmth of Bellatrix's hand in hers was an anchor, and the quiet of the dormitory was a blanket, but the energy humming through Bellatrix's skin was a live wire Mia couldn't ignore.
"You're still thinking," Mia whispered into the dark.
"I'm always thinking."
"I know. But you're vibrating with it."
Bellatrix let out a slow breath, a concession. "It's the adrenaline. The come-down. It makes everything… sharp."
Mia shifted, rolling onto her side to face her. In the faint glow from the dying fireplace, she could just make out the proud line of Bellatrix's profile, the dark fan of her lashes against her cheek. "Tell me what's sharp."
Bellatrix turned her head. Her obsidian eyes caught the low light, gleaming. "You. This. The fact that he's out there plotting and we're in here…" Her hand tightened around Mia's. "Alive."
Mia brought their joined hands to her lips and kissed Bellatrix's knuckles. The skin was cool. "We're more than alive."
"Yes." The word was a release of breath. Bellatrix moved then, a decisive roll that brought her half over Mia, one leg sliding between hers, her free hand coming up to cradle Mia's jaw. "We are."
She kissed her. It wasn't the frantic, relieved kiss from the common room hearth. This was slower. Deeper. A rediscovery. Bellatrix's mouth was warm and certain, her tongue tracing the seam of Mia's lips until she opened for her with a soft sigh.
Mia's hands came up, one tangling in the wild silk of Bellatrix's curls, the other sliding under the loose fabric of her sleep shirt to find the hot, smooth skin of her back. She felt the muscles shift, the faint ridge of her spine.
Bellatrix broke the kiss, her forehead resting against Mia's. Her breath was warm on Mia's mouth. "I kept seeing your face. When he was talking. It was the only thing that didn't sound like a lie."
"What did you see?"
"This." Bellatrix kissed her again, softer. "Your mouth. The way you look at me when you're trying not to smile. The exact shade of your eyes in the library light." Her lips traveled down Mia's jaw, to the pulse point below her ear. "I memorized you. Used you as a ward."
A shiver, hot and profound, went through Mia. She arched her neck, giving Bellatrix better access. "Did it work?"
"Perfectly." Bellatrix's teeth grazed her skin, not hard, a promise. Her hand left Mia's jaw, skating down her throat, over the collar of her own borrowed shirt, to settle on the curve of her breast. Her thumb brushed a nipple through the thin cotton.
Mia gasped, the sensation a bright spark after the long, cold fear of the evening. Her own body responded immediately, a flush of heat spreading low in her belly, a familiar ache beginning to throb.
Bellatrix felt it. She always did. Her hand stilled, her thumb pressing a little more firmly. "Show me," she murmured against Mia's neck. Her voice had dropped, gone husky. "Show me we're here."
Mia's fingers found the hem of Bellatrix's shirt. "This is in the way."
"So remove it."
She did. Lifting it up and over Bellatrix's head, tossing it carelessly toward the foot of the bed. The firelight painted Bellatrix's skin in gold and shadow, the elegant lines of her shoulders, the dark peaks of her nipples already tight.
Bellatrix shivered, but not from cold. Her eyes were black pools, fixed on Mia's face. "Your turn."
Mia sat up just enough to pull her own shirt off. The dormitory air was cool on her bare skin, raising goosebumps, but Bellatrix's gaze was a brand. She looked, her chest rising and falling a little faster, and something in her expression shifted from hunger to something softer, more reverent.
"You are so beautiful," Bellatrix said, the words quiet, almost awed. She didn't say such things often. They landed with the weight of truth.
She leaned down and kissed the hollow of Mia's throat. Then the slope of her breast. Her mouth closed over Mia's nipple, and Mia cried out, her back bowing off the mattress. Bellatrix laved it with her tongue, then sucked, gently at first, then with a firm, rhythmic pressure that sent jolts of pleasure straight to Mia's core.
Mia was wet already. She could feel the slick heat between her legs, the needy throb that matched the pull of Bellatrix's mouth. Her hands fisted in the sheets. "Bella—"
Bellatrix switched to her other breast, giving it the same devoted attention. Her hand slid down Mia's stomach, over the waistband of her sleep shorts, and palmed the damp fabric between her legs.
Mia jerked, a full-body spasm. "Merlin."
"Yes," Bellatrix breathed against her skin. She pressed the heel of her hand down, a firm, steady pressure, and began to move it in slow, maddening circles. The cotton was soaked, a thin barrier that did nothing to dull the sensation, only heightened the friction.
"Off," Mia gasped, tugging at the shorts. "Please."
Bellatrix helped her, pushing them down her legs and discarding them. Then she was there again, her hand on bare skin, her fingers sliding through the wetness. She made a low, approving sound in her throat. "You're always so ready for me."
Mia could only nod, her hips lifting off the bed, seeking more. Bellatrix's touch was expert, knowing. She traced her folds, circled her clit without quite touching it directly, drawing out the ache until Mia was trembling.
"Look at me," Bellatrix whispered.
Mia forced her eyes open. Bellatrix was propped above her, her curls a dark halo, her face flushed with arousal and something fiercer—possession, devotion. Her fingers stilled. "Tell me what you want."
"You." Mia's voice was ragged. "Inside. Now."
A slow, wicked smile touched Bellatrix's lips. She lowered her head and kissed Mia, deep and filthy, as two of her fingers finally, blessedly, slid inside.
Mia moaned into her mouth, the stretch a perfect, familiar burn. Bellatrix curled her fingers, finding the spot that made Mia see stars, and began to move.
The rhythm is everything. Bellatrix's fingers move inside her with a deep, steady cadence, curling just so on each stroke, and Mia’s world narrows to that perfect, slick friction. The stretch is exquisite, the fullness a truth her body understands better than any spell.
Bellatrix kisses her through it, swallowing Mia's moans, her own breath coming in ragged little gusts against Mia's cheek. She shifts her weight, her thigh pressing more firmly between Mia's legs, and the added pressure is divine.
"That's it," Bellatrix murmurs against her lips. Her voice is raw, stripped of all aristocratic pretense. "Let me feel you."
Mia is trembling, a fine, constant shudder that starts in her core and radiates out to her fingertips. Her hips lift to meet every thrust, chasing the building coil of heat. Her hands are fisted in Bellatrix's hair, not pulling, just holding on.
Bellatrix speeds her hand, her wrist flexing. The wet sound of their joining is obscene and perfect in the quiet room. She breaks the kiss to watch Mia's face, her own expression fierce with concentration, her black eyes glittering in the dim light.
"You're close," she says, a statement, not a question. Her thumb finds Mia's clit, circles it once, twice—firm and direct.
The spark ignites. Mia cries out, a broken sound, as pleasure detonates, white-hot and consuming. It floods her, pulls her under, shakes her apart. Her body arches off the bed, taut as a bowstring, every muscle clenching around Bellatrix's fingers.
Bellatrix holds her through it, her movements gentling but not stopping, drawing out the waves until they soften into tremors. Mia collapses back onto the sheets, boneless and gasping.
Slowly, carefully, Bellatrix withdraws her fingers. She brings her hand to her own mouth, her eyes locked on Mia's, and slowly licks them clean. The sight is possessive, primal, and it sends a fresh, aftershock thrum through Mia's spent body.
Bellatrix lowers herself, settling beside Mia, one arm draped across her stomach. Her skin is slick with sweat. She presses a kiss to Mia's shoulder.
Mia turns her head. Bellatrix's face is flushed, her lips swollen, but her eyes are clear. The frantic energy from earlier is gone, replaced by a deep, sated calm. "You," Mia breathes, the only word she can manage.
A slow smile touches Bellatrix's mouth. "Me."
They lie there for long minutes, breathing syncing. The fire pops in the hearth. Mia traces idle patterns on Bellatrix's arm, feeling the fine, dark hair, the muscle beneath.
"He wanted to mark me," Bellatrix says quietly, into the silence. Her voice is matter-of-fact. "Not like the Death Eaters. Not yet. But he... placed a thought. A suggestion. To report anything unusual about Arcturus's new protégé."
The cold dread is momentary, instantly soothed by the warm skin under Mia's hand. "What did you say?"
"I said I would observe." Bellatrix's fingers tighten slightly on Mia's waist. "I said it like it was a foregone conclusion. Like of course I would. He liked that. The assumption of loyalty."
Mia turns onto her side to face her. "Was it difficult? Resisting the... suggestion?"
Bellatrix considers. "It was like a whisper in a language I almost understand. Persistent. But my mind is my own." Her gaze sharpens, focusing on Mia. "It was easier, having your face as an anchor. A truth to hold onto that was louder than his whisper."
She reaches up, tucks a damp curl behind Mia's ear. The gesture is unbearably tender. "He is compelling. Charismatic. But you were right—it's a performance. I could see the seams."
"Good." Mia kisses her, softly. "That's good."
Bellatrix's hand slides down, over Mia's hip. "Your turn."
"I'm—"
"You're not done." Bellatrix's voice is low, certain. Her hand slips between Mia's thighs, finding her wet and sensitive. Mia gasps. "I need to feel you again. I need to know we're both here."
Her touch is different now—less frantic, more explorative. Soothing circles that gradually build the heat again, coaxing Mia's body back to life. Mia lets her head fall back, surrendering to the renewed ache, this one slower, deeper.
Bellatrix kisses her throat, her collarbone. "Tell me about the future," she whispers. "The good parts. The quiet parts."
The request cracks something open in Mia's chest. She closes her eyes. "There's a house," she murmurs, her hips beginning to move against Bellatrix's hand. "Small. A garden. You grow venomous tentacula because you think they're pretty."
Bellatrix huffs a quiet laugh against her skin, her fingers sliding lower, dipping inside just enough to make Mia shiver.
"And there are books," Mia continues, breath catching. "Everywhere. And we argue about the translations. And sometimes we don't argue at all. We just... are."
"Yes," Bellatrix breathes. She increases the pressure, her rhythm becoming more insistent. "Keep going."
"It's safe." The word is a prayer. Mia's hands find Bellatrix's back, holding on. "You're safe. You're whole. You're mine."
Bellatrix makes a sound, a choked-off thing that is half sob, half groan. She kisses Mia, hard, as her fingers work in a devastating, perfect rhythm. The second crest builds faster, higher, drawn from a deeper well of emotion.
When it breaks, it's quieter than the first. A drowning, a melting. Mia shakes apart silently, tears leaking from the corners of her eyes, her body pulsing around Bellatrix's hand in long, slow waves.
Bellatrix holds her through it, her own body trembling. She doesn't let go until Mia is completely still, boneless and spent.
Then she curls around her, tucking Mia's back against her chest, their legs tangled. She presses her face into Mia's hair. Her breathing is uneven.
Mia covers the arm wrapped around her stomach with her own. She can feel the cool metal of the Peverell ring on her finger, the steady beat of Bellatrix's heart against her spine.
"We'll have that house," Bellatrix whispers, her voice thick with promise. "I'll burn the world for it."
Mia believes her. In the dark, with the scent of their skin and sex in the air, with the ghost of a Dark Lord's whisper still hanging in the castle air, she believes her completely. The fear is still there, a cold stone in her gut. But it is outweighed, for now, by the warm, breathing certainty of the witch holding her.
Outside, the castle sleeps. The shadows in the corridor are long and empty. The torch has finally guttered out.
Inside, Bellatrix Black holds the woman she loves, and plans a future she was never supposed to have. Her fingers, still slick, trace idle, protective runes against Mia's skin. A silent, private magic. A ward of her own making.