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The Devil's Heir

Summary:

To some, he was the son of the Dark Lord—the man whose name once made the entire wizarding world shake with fear.

To others, he was the powerful heir of the most feared house in Britain, a Slytherin prince destined for greatness.

But to Henrietta Euphemia Potter, he was simply Mattheo.

A boy with sharp smiles and dangerous eyes.

A boy who stole her breath with every word he spoke and every heated glance they shared.

A boy she should have hated.

A boy she should have stayed away from.

yet somehow she couldn’t.

 

The moment he noticed her, he knew it was over for him.

Her name felt like a prayer on his lips.

The melodious sound of her Laughter echoed through his mind like a siren's song.

Her Gaze, God. Her eyes drowned him in an abyss of enchanting green.

Everything about her pulled Mattheo Thomas Riddle to his ruin.

Yet he couldn't help seeking more of her.

She's an unsated desire for the Devil's Heir.

Notes:

(See the end of the work for notes.)

Chapter 1: Little Freak

Chapter Text

Little Freak

 

The cupboard under the stairs at number four, Privet Drive was exactly three steps wide and two steps long.

Henrietta Potter knew this because she had counted. Many times. There wasn't much else to do in the dark.

She'd measured the space in other ways too — in the number of water pipes that ran along the ceiling, the number of spiders that had made their homes in the corners tho she'd stopped counting after twelve, because it felt rude to keep track of something that was, at the very least, keeping her company.

She was ten years old and she had lived in this cupboard for as long as she could remember.

Not that she remembered very much before the cupboard. There were flashes, sometimes — green light, a woman's voice, high and warm and terrified, a sound like the world ending — but they came and went like dreams she couldn't hold on to, dissolving the moment she tried to look at them directly. She'd long since stopped trying.

'Henrietta Potter' That was her name, though nobody at number four, Privet Drive ever used it.

Aunt Petunia called her 'girl.' Uncle Vernon called her 'you.' Dudley — when he bothered to acknowledge her existence at all, which was usually only when he wanted to hit her or take something from her — called her 'freak,' which he had learned from his father, who said it with a kind of satisfied contempt that suggested he'd been waiting his whole life for a word that precise. To them she was a freak who didn't deserve to be called by her name.

Henrietta didn't think she was a freak. But she had learned, early and efficiently the way children learn things that determine their survival, not to say so out loud.

She was small for her age. That was the first thing people noticed, the smallness — she was slight and fine-boned and looked, as Mrs. Clarke from down the street had once observed to Aunt Petunia in a hushed voice, 'terribly delicate, isn't she ?, Petunia, like she might blow away —' though what Mrs. Clarke had meant as concern, Aunt Petunia had received with a sharp sniff and the particular silence of someone who thought the girl's delicateness was an inconvenience she had not signed up for.

But if the smallness was the first thing, the second thing was always her face.

Black curls — thick and wild and entirely their own, falling past her shoulders in a way that no amount of Aunt Petunia's frustrated braiding could fully tame. 

And then the eyes.

Green. Not just green — green in the way that paused people mid-sentence. 'Unnerving', Mrs. Figg had also said once, though she'd said it like a compliment. To the underfed girl living in a cupboard under stairs it would be the first compliment she ever received.

Aunt Petunia didn't like the eyes. She never said so directly, but Henrietta had noticed — years ago, when she'd still been young enough to notice things and feel them — that her aunt never looked at her directly. Not in the face. Not in the eyes. She looked somewhere just past Henrietta's left shoulder, as though eye contact might do something irreversible.

Henrietta had decided that the eyes must look like her mother's.

She didn't know why she thought that. She had no photographs, no memories clear enough to confirm it. But it was the only explanation that made sense for the way Aunt Petunia — who had been her mother's sister, who must have looked at her mother's face a thousand times before everything ended — couldn't look at her.

She tucked this theory away in the same quiet interior place she kept all her theories, all her observations, all the small careful thoughts she had accumulated in the dark of the cupboard over ten years of being very still and very watchful, and she didn't mention it to anyone.

She didn't mention most things to anyone.

It was safer that way.

---

The morning of the twenty fourth of July was a Thrusday.

She was in the kitchen at half past six in the morning, because that was when she was expected to be in the kitchen, frying bacon and arranging toast and making sure the eggs were not too soft and not too hard.

Henrietta flipped the bacon. Watched the fat bubble and spit. Thought about nothing in particular.

This was a skill she had developed — the art of thinking about nothing. Of making her mind smooth and still and very quiet, like the surface of a pond on a windless day. She had found that the Dursleys bothered her less when she wasn't fully present for it. Not absent enough to miss a cue, not present enough to be wounded by one.

She heard the stairs creak. Then the heavy thud-thud-thud of Dudley's feet, which had only gotten heavier since he'd started secondary school, where apparently the primary activity was eating, based on all available evidence.

She didn't turn around.

"Bacon's almost done," she said, because it was easier to say it than to wait for him to demand it.

Dudley grunted, which was his version of acknowledgment, and dropped into his chair with enough force that the table shook slightly.

Aunt Petunia appeared next, in her dressing gown, hair already set from the rollers she slept in. She looked at the stove, at the pan, at the toast cooling on the rack — her eyes traveling the entire kitchen without once landing on Henrietta — and something in her shoulders released incrementally, which meant the eggs were acceptable.

"Don't stand there gawking," she said, though Henrietta was not gawking at anything. "Set the table."

"Yes, Aunt Petunia."

She set the table. She served the plates. She poured the orange juice, and the tea, and she put the paper by Uncle Vernon's seat because she'd learned two years ago that forgetting the paper in the morning was the kind of offense that reverberated well into the afternoon.

She was just sitting down to her own considerably smaller portion when the post came through the letter slot in the front door.

Dudley launched himself from his chair — he always did this, descended on the post as though it might contain money, which occasionally it did, from Aunt Marge — and thundered into the hall.

Henrietta ate her toast.

She heard the sound of letters being shuffled. Dudley's heavy breathing. A pause.

Then, with great suspicion: "There's one for the freak."

The kitchen went very still.

Henrietta looked up from her toast.

Uncle Vernon had gone the particular color he went when something displeased him in a way that also confused him — a deep unsatisfying red, like uncooked beef. He was staring at the letter Dudley had carried back into the kitchen and was now dangling by two fingers, as though it might be contagious.

Henrietta looked at the envelope.

It was thick. Yellowish, like old parchment. Her name and address were written on the front in vivid emerald green ink, in handwriting that was nothing like anything she'd seen before — looping and deliberate, somehow conveying importance even in the mundane task of writing a street address.

Miss H.E. Potter,
The Cupboard Under the Stairs,
4 Privet Drive,
Little Whinging,
Surrey.

She stared at it.

The cupboard under the stairs.

Something about seeing it written down — her address, her actual address, the cupboard, in ink on parchment as though it were simply a fact and not a thing that made her chest do something complicated — made her feel strange. Not sad, exactly. Not angry. Something in between that she didn't have a good word for.

"Give me that," said Uncle Vernon, snatching the letter from Dudley so fast his son yelped. He stared at it. His color changed again, cycling through several shades of red before settling on something approaching purple.

Aunt Petunia had gone completely still at the sink.

"Who's it from?" Dudley demanded.

Nobody answered him.

"It's mine," Henrietta said. Her voice came out very quiet, very level. Years of practice. "It has my name on it."

Uncle Vernon looked at her over the top of the envelope. His small eyes were doing something she'd seen them do before on specific occasions — the occasions when the strange things happened around her, the things that nobody ever talked about but that everyone had clearly agreed to pretend were not happening. The look was something between fury and fear, and fear was winning today, which was new.

He put the letter in his breast pocket.

"You'll not be reading any letters," he said.

Henrietta looked at him for a moment. Just a moment. Long enough for him to see that she'd like to argue, and long enough to decide not to.

"Yes, Uncle Vernon," she said, and went back to her toast.

---

She didn't get the letter that day.

Or the next day, when two arrived.

Or the day after that, when five came at once, sliding under the front door and through the mail slot in such numbers that Dudley fell over two of them on his way to breakfast and sat on the floor looking confused, and Uncle Vernon went completely wordless for four and a half minutes, which was a record.

By the end of the week there were dozens. They came at all hours — morning post, afternoon, they came through the letterbox, they came tucked into the milk bottles, one arrived inexplicably in the egg carton. Uncle Vernon nailed the letterbox shut and Henrietta sat in the cupboard and listened to the sound of letters arriving anyway, through cracks and under doors and down the chimney, and she felt something happening in her chest that she didn't entirely know what to do with.

Hope was a dangerous thing in the cupboard under the stairs. She had learned this early too.

But this — whatever this was — was beginning to feel bigger than her ability to suppress it.

---

They left Privet Drive on a Friday.

Uncle Vernon drove them — without explaining where, without answering questions, speaking only to bark at Dudley to stop whining and at Aunt Petunia to read the map properly — for what felt like most of the day, switching roads and doubling back and taking turns that seemed designed to confuse anyone who might be following, though 'who' might be following and 'why' was a question Henrietta kept carefully to herself.

They ended up at a hut on a rock in the sea.

It was exactly as pleasant as it sounded.

The hut was cold and damp and smelled like something that had been wet for a long time and had made its peace with it. There was one room with a fireplace that had no wood and two ancient mattresses on the floor, and outside there was nothing but sea and rock and the kind of wind that had personality.

Dudley took both mattresses.

Henrietta drew a birthday cake on the floor in the dust — because in all the chaos of the week, nobody had mentioned that tomorrow was her birthday and she had decided not to mention it either, because expecting things was the fastest way to be disappointed by them — and she lay on the cold floor and listened to the rain and thought about the letters.

Fifty-seven of them. She'd counted.

All addressed to her, in the cupboard under the stairs, in green ink.

She closed her eyes.

At exactly midnight, she turned eleven years old.

'Happy birthday to me,' she thought, in the dark, on the floor of a hut on a rock in the sea.

And then the door came off its hinges.

---

The man who walked in was the largest person Henrietta had ever seen.

Tall enough that he had to duck through the doorway. Wide enough that he nearly filled it anyway. He had a great bristling beard the color of iron and wild dark hair and hands like dinner plates, and he was wearing an enormous coat that appeared to have approximately forty pockets, all full of things that shifted and clinked as he moved.

He looked at the room. At Uncle Vernon, who had gone for his rifle and then appeared to reconsider. At Aunt Petunia, white as paper. At Dudley, whimpering on the mattress.

And then at Henrietta, sitting up from the floor with dust on her cheek and wide green eyes and the particular expression of someone who has learned to assess new situations very quickly.

His face — the parts of it visible around the beard — split into something enormous and warm.

"Henrietta Potter," he said, and his voice was like boulders rolling downhill, deep and rumbling and somehow gentle despite its volume. "Las' time I saw yeh, you were jus' a baby. Look at yeh now."

He pulled a slightly squashed box from one of the forty pockets and held it out to her. Inside was a birthday cake, chocolate, with pink icing that read 'Happee Birthdae Henrietta' in somewhat unsteady letters.

Henrietta stared at the cake.

She felt something happen to her face that she didn't fully authorize — a softening, a wobble, quickly controlled — and she pressed her lips together and looked up at the enormous man with the dinner-plate hands who had just broken down a door to bring her a birthday cake to a hut on a rock in the middle of the sea.

"Thank you," she said. Her voice was very small. "Nobody's — I've never had a birthday cake before."

Something moved across his face at that. Something that looked like it hurt him.

"Well," he said, in a voice that had gotten a little rough around the edges, "yeh've got one now."

He settled himself on the floor — the whole hut shuddered — and looked at her with dark beetle-bright eyes full of warmth.

"My name's Hagrid," he said. "Rubeus Hagrid. Keeper of Keys an' Grounds at Hogwarts." He paused. "An' you, Henrietta Potter, are a witch."

---

She read the letter — her letter, finally, the one she'd been watching arrive in quantities for a week — by the light of the fire Hagrid had made appear in the empty grate, and she read it carefully, the way she read everything, which was twice through quickly and then once more slowly, paying attention to the parts that felt important.

Hogwarts School of Witchcraft and Wizardry. Headmaster: Albus Dumbledore.

We are pleased to inform you that you have been accepted

She put the letter down when she finished the second slow read.

Hagrid was watching her.

"Questions?" he said.

"Many," she said.

He grinned. "Ask 'em."

So she did. Carefully, in order, the questions she had organized in her head while reading. She asked about the school and about her parents and about the thing she'd understood from the way Hagrid had said her name, the way he'd looked at her — that she was, to him and apparently to a great many other people, not just a girl but a *fact,* a thing that had happened, something historical.

She asked about the night her parents had died.

Hagrid told her. His voice got rough again in the parts about her parents, which told her things about him — that he had known them, that he had loved them, at least in the way a person loves people they admire — and she listened to all of it with her hands in her lap and her face very still and her green eyes steady on his face.

When he finished she was quiet for a moment.

"Voldemort," she said, very precisely, because Hagrid had flinched and stumbled over the name and she thought that was something worth noting.

Hagrid shuddered. "Don' say the name—"

"Why not?" she said, genuinely curious. "If he's gone—"

"People're still scared," said Hagrid. "People don' want ter—"

"Being afraid of a name doesn't make the thing it belongs to more dangerous or less," she said, quietly. "It just means you've given it more power than it deserves."

Hagrid stared at her.

She looked back at him, small and dust-smudged on the floor of the hut, green eyes calm in the firelight.

"Well," Hagrid said, after a moment, in a voice of genuine wonder. "You sound jus' like yer mum."

Henrietta felt that in her chest, quiet and deep.

She didn't say anything. She just looked back at the letter in her hands, and let herself feel it — the warmth of it, the complicated grief of being compared to someone she couldn't remember — and then she folded the feeling up and set it aside.

"When do we go to Diagon Alley?" she said.

---

They went on a Tuesday.

Hagrid took her on the Underground, which he was too large for in a way that caused considerable disruption but which he navigated with cheerful indifference to the stares. Henrietta sat next to him and watched London pass through the windows and thought about starting over.

That was what this was, she had decided. A starting over. A before and after. She had lived for eleven years in the before — in the cupboard, in the silence, in the small careful space she'd built around herself to survive — and now there was going to be an after.

She was not sure who she would be in the after.

But she was, for the first time, curious to find out.

---

Diagon Alley was the most extraordinary thing she had ever seen.

She stood at the entrance — the brick wall that had shuddered and folded back at Hagrid's touch, opening onto a cobblestoned street that shouldn't have existed and somehow entirely did — and she let herself stare, which she rarely allowed herself to do, because staring was a way of showing people what you wanted, and showing people what you wanted was dangerous.

But here there was so much to want.

The shops leaned together above the narrow street like they were sharing secrets. Broomsticks in one window, jars of something that glowed faintly purple in another. Owls watching from cages with the patient superiority of creatures that had opinions. A woman in robes the color of autumn buying something wrapped in paper that moved. A boy a little older than Henrietta arguing with what appeared to be a hat about the price of something.

It smelled like candle wax and old paper and something sweet and something else she couldn't name, something that felt like electricity, like the moments just before the strange things happened around her, the hum of something barely contained.

Magic she thought.

She breathed it in.

"All righ'?" said Hagrid, looking down at her with his beetle-bright eyes.

"Yes," said Henrietta, and meant it more than she'd meant anything in recent memory.

---

They went to Gringotts first.

The bank was white marble and staffed by goblins, who looked at her with the particular expression of creatures who had been doing their jobs for centuries and found human reactions to them tedious. She looked back at them with straightforward interest, and something about her directness seemed to land differently — the goblin who led them to her vault, a creature with a long sharp face, glanced at her twice during the cart ride as though reassessing something.

Her vault was full of gold.

She stood and looked at it for a moment — the heaps of Galleons glinting in the torchlight, the silver, the bronze — and felt something that was not greed and was not vanity but was something more like this was theirs, her parents, people she'd never known, people who had apparently loved her enough that the last thing they'd thought about before dying was making sure she would be provided for.

She took enough for her school things and not more.

---

They bought her books first, because she asked to. Hagrid seemed faintly surprised by this but not displeased. She went through the list carefully in Flourish and Blotts, checking each title, and she stood in the aisle with 'The Standard Book of Spells (Grade 1)' open in her hands and read the first three pages before Hagrid said, gently, that they had more shops to get to.

"Sorry," she said, without looking up. "I'm almost done with the section."

Hagrid made a sound that was somewhere between a chuckle and resignation, and waited.

She finished the section. She bought all the books on the list and one that wasn't, because the title interested her, and she carried the bag herself even though Hagrid offered, because she had learned very early that depending on people to carry things for you created a vulnerability she preferred to avoid.

They were making their way toward Madam Malkin's for robes when it happened.

She nearly walked into him.

She had been looking at a window display — some kind of enchanted compass that was spinning through directions that weren't on any map she'd seen — and she'd stepped sideways without fully checking, and suddenly there was someone there, and she pulled up short barely in time, the books swinging in her bag.

"Sorry—" she started, automatically.

And stopped.

He was tall for his age — whatever age that was, probably eleven, probably starting Hogwarts too, judging by the Madam Malkin's bag in his hand. Dark hair. Sharp pale face, handsome in a way that already knew it, which was the worst kind of handsome. Dark eyes that had been moving in the opposite direction and now stopped, falling on her face with something that was almost a collision.

A beat.

He looked at her the way people sometimes did — the eyes first, those ridiculous green eyes, he paused, then the rest of her face, then back to the eyes — and something moved in his expression that she couldn't quite read.

"Watch where you're—" he started, and then his eyes dropped to her forehead, where her hair had fallen back from the lightning bolt scar visible at her hairline, and he stopped.

She was used to this. The recognition, the adjustment, the way people rearranged themselves when they realized what they were looking at.

What she wasn't used to was what happened next.

Instead of the reverence — the wide eyes, the immediate deference that most people in the wizarding world seemed to default to when they understood who she was — his expression did something different. It sharpened. Became something more like interest, which was different from awe, which was different from anything she'd received on the street today.

He looked at her like—

She didn’t know what word to use.

"Henrietta Potter," he said. Flatly, like he was filing the information away.

"I don't know you," she said, equally flat.

Something shifted at the corner of his mouth. The ghost of something that might have been a smirk, or might have been acknowledgment. It was difficult to tell.

"Mattheo Riddle," he said.

She didn't know the name.

She would learn, later — much later, in a chamber full of water underneath her school, with a young Ginny Weasley lying on the floor, pale and a diary with the memory of a brilliant boy. What the name 'Riddle' meant. What it connected to.

But here, in the golden crowded street of Diagon Alley, in the first real day of her life after finding out she was a witch, she just looked at him with her unnerving green eyes and said, simply

"Are you starting Hogwarts this year?"

He looked slightly thrown by the question. As though he'd expected something else — fear, perhaps, or recognition as if she should be aware of it.

"Yes," he said, after a beat.

"Same," she said.

She stepped around him, adjusting the bag on her shoulder.

"See you there" she said and walked away.

She didn't look back. But she was aware — in that quiet watchful part of her that noticed everything — that he was watching her go.

---

She got her wand last.

Ollivanders was narrow and dusty and smelled like cedar shavings and something older, and the man who emerged from between the towering shelves had wide pale eyes that gave the impression of someone who saw slightly more than was comfortable.

He looked at her for a long moment when she walked in.

"Henrietta Euphemia Potter," he said, in a voice like paper. "I wondered when I'd be seeing you."

He measured her — span of her wand hand, length of her arm, some other measurements she didn't fully understand — and then he started bringing boxes. Almost all wands she tried, each doing nothing or doing something wrong — one set the measuring tape on fire, one sent a shower of sparks that smelled oddly of rain.

The eighth was holly. Eleven inches. A single phoenix feather.

She felt it before she even moved it — warmth in her palm, a current like a river finding its way back to itself, a rightness that was entirely different from any rightness she'd felt before.

She moved the wand.

The shop filled with gold and red light, warm and sweeping, and then faded.

Mr. Ollivander was looking at her in a way she couldn't decode.

"Curious," he said softly. "The wand that gave you your scar — the brother of that wand gave you yours."

She looked at the wand in her hand.

"Same phoenix," he said. "He has done many great things. Great but terrible things. It seems that we can expect the same from you Miss Potter."

She curled her fingers around the wand.

 

She walked out into the golden afternoon of Diagon Alley with her wand in her bag and an owl she'd bought on impulse from Eeylops — a snowy white one that had looked at her with solemn amber eyes as though they had already decided something about each other — perched on her shoulder.

She had a school. She had a wand. She had a key to a vault full of her parents' gold.

She was, for the first time in eleven years, going somewhere she was wanted.

The owl — she'd name her Hedwig, she decided, — ruffled her feathers against Henrietta's cheek. she smiled at it softly and tucked it away, carefully, and went to find Hagrid.

 

This day will forever be imprinted into her mind not because of the magical street she was witnessing for the first time but because of a certain black haired boy whose would—much later—refuse to let her have some peace.