Nadia told herself it was just a house.

That was what she kept repeating in her head the entire drive over, watching unfamiliar streets replace the ones she had grown up on. Just a house. Four walls and a roof and a set of people she was supposed to call family now because two adults had signed a piece of paper and decided that was how life worked.

Her mother reached over from the passenger seat and squeezed her knee.

"You are going to love it there."

Nadia smiled. It did not reach her eyes.

She had nothing against Daniel Voss. He was kind in that quiet, steady way that made her mother laugh again after years of not laughing, and she was grateful for that. Truly. But gratitude and enthusiasm were different things, and Nadia had never been good at pretending they were the same.

The house came into view at the end of a tree-lined street.

It was not what she expected. She had imagined something cold — all sharp angles and expensive silence. Instead it was warm-looking. Wide windows. A front porch with actual furniture on it. The kind of house that looked lived in rather than displayed.

Daniel was already outside when they pulled up, smiling with his whole face the way he always did.

And next to him stood someone Nadia did not immediately register.

Then she did.

She did not know why her stomach did what it did. He was just a person. Tall, arms crossed loosely, watching the car pull in with an expression she could not read from this distance. Dark hair. Something about the way he stood — like the world could rearrange itself around him and he would not bother adjusting.

She got out of the car.

He looked at her.

Something passed through his expression so fast she almost missed it. Almost.

Then it was gone, and he was just a guy standing on a porch, and Daniel was already talking.

"Nadia, this is Callum."

Callum looked at her the way you look at something you are trying very hard to be neutral about.

"Hey," he said.

"Hey," she said back.

That was it. That was the whole thing. And yet she had the strangest feeling, standing there on that driveway with her one suitcase and her mother beaming beside her, that something had just started that she did not have a name for yet.

---

Callum had known this day was coming for three months.

Three months since his father sat him down and said her name — Nadia Reyes — and Callum had gone completely, carefully still on the inside while nodding along on the outside like a functioning human being.

He had told himself it would be fine.

He had told himself a lot of things.

The car turned onto the street and he felt his jaw tighten before he could stop it. He uncrossed his arms. Crossed them again. His father was talking beside him but the words were not landing properly.

Then she stepped out of the car.

Two years. It had been two years and she looked exactly the same and completely different and he hated that he noticed either of those things.

She had not recognized him. He could see that immediately, the way she glanced over with nothing in her expression — no flicker, no pause. Just a girl looking at a stranger.

He had known that was probably how it would go. That night had meant nothing to her. She had been sad about something she never explained, and he had talked to her for two hours by a window at Marcus's party, and she had laughed exactly once at something he said, and then her friend had pulled her away and that had been that.

He had thought about her longer than he should have.

And now she was going to live in his house.

"Callum, this is Nadia."

He looked at her directly for the first time.

Up close she was worse. That was the only word his brain produced, which was not helpful. She was looking at him with this careful, measuring expression like she was already deciding what category to put him in.

"Hey," he said. Neutral. Easy.

"Hey," she said back.

Cool. Unbothered. Already looking past him toward the house.

He told himself that was fine. That was actually better. Easier if she was indifferent. Easier if this was just two people who happened to share an address and nothing more.

He unclenched his jaw and followed everyone inside.

By the time he reached the kitchen, Marcus had already texted him.

*so how is the new stepsister*

Callum set his phone face down on the counter.

He was not answering that.

---

Dinner that first night was the specific kind of uncomfortable that everyone was trying too hard to pretend was not uncomfortable.

Daniel made pasta. Her mother kept finding reasons to touch his arm. The conversation moved through safe topics — Nadia's course at university, Callum's job, a neighbor's dog that had apparently been an ongoing issue for months.

Nadia ate and answered questions and smiled in the right places.

Callum sat across from her and said almost nothing.

She noticed.

Not that he was rude — he was not. He answered when spoken to, he refilled the water jug without being asked, he laughed once at something Daniel said. He was perfectly pleasant.

Just not to her.

With her he was polite in that particular way that felt like a wall dressed up as a welcome mat. Every answer he gave her was just short enough to close the conversation without being obviously dismissive.

She did not know why it bothered her.

It did though.

After dinner she offered to help clear the table. Callum was already at the sink. She stacked plates beside him without asking and he glanced sideways at her, just briefly.

"You do not have to do that," he said.

"I know," she said.

She did it anyway.

He did not say anything else. Neither did she. They cleaned up in silence while their parents laughed about something in the other room, and the kitchen felt approximately the size of a shoebox, and Nadia became very focused on the task of rinsing a single glass.

She could feel him being aware of her. That was the strangest part. He was not looking at her — she could tell — but there was something in the way he moved that was slightly too deliberate, like a person making sure not to step into a space they had decided was off-limits.

She filed that away and said nothing.

When she finally went upstairs, she sat on the edge of her new bed in her new room and looked at the ceiling and thought about the way his expression had shifted for that half a second when she got out of the car.

Like he had seen something he was not expecting.

She told herself she had imagined it.

She was not entirely sure she believed that.

---

Down the hall, Callum lay on his back in the dark and stared at the ceiling and thought about absolutely nothing at all.

He was very focused on the nothing.

It was not working.

She had been there four days and already he had a problem.

Not with her, specifically. With the situation. With the fact that the house was not as big as it had always felt before she moved in, and that the kitchen seemed to be her preferred place to exist at seven in the morning, and that she made coffee like it was a personal ritual — slow, deliberate, standing at the counter with both hands wrapped around the mug before she had even taken a sip.

Callum had started waking up earlier.

He told himself it was because he had things to do.

This particular morning he came downstairs to find her already there, sitting cross-legged on the counter in an oversized shirt and shorts, reading something on her phone. She did not hear him come in.

He could have made noise. He did not.

He watched her for approximately three seconds — which was two seconds longer than was reasonable — and then she looked up.

Neither of them said anything for a moment.

"You are up early," she said.

"I live here," he said.

She looked at him with that expression she had. The one that said she was deciding whether to bother responding or not. She decided not to, and looked back at her phone, and he moved to the coffee machine and tried to remember how to be a normal person.

The problem was she was right there. Close enough that he could smell whatever she used in her hair and he despised that he noticed that.

"You are sitting on the counter," he said.

"Correct," she said, not looking up.

"We eat off that counter."

She looked up then, slow and deliberate, and took a long sip of her coffee with direct eye contact.

He turned back to the machine.

He heard her exhale something that was almost a laugh and was not sure if that was better or worse.

---

The trouble with Callum, Nadia decided, was that he was inconsistent in a way that was difficult to ignore.

Cold with her at breakfast. But she had come home the previous afternoon to find he had carried her heaviest box upstairs and left it outside her door without mentioning it. She had almost said something at dinner. Then she looked at his face — perfectly neutral, not waiting for thanks, not even glancing her way — and thought better of it.

She could not figure him out and that bothered her more than the coldness did.

On day four she met his friend group properly.

There were three of them — Jasper, who talked too much and meant none of it unkindly; Priya, who had sharp eyes and said less than she knew; and Ryan, who was tall and easy and immediately turned his full attention to Nadia in a way that was obvious to everyone in the room.

"So you are the new addition," Ryan said, smiling at her from across the kitchen island.

"That is one way to say it," she said.

He laughed. "How long are you staying?"

"Permanently, technically."

"Even better."

It was harmless. Nadia knew it was harmless. Ryan had that energy — warm and a little flirtatious with everyone, the kind of person who made you feel interesting without meaning anything serious by it.

She was mid-sentence, telling him something about her course, when she felt it.

That specific feeling of being watched.

She glanced sideways without thinking.

Callum was leaning against the far counter, talking to Jasper, not looking at her.

But something in his jaw was tight.

She turned back to Ryan.

Ten minutes later Callum crossed the kitchen for no apparent reason, stopped beside her, and said to Ryan, "Didn't you say you had somewhere to be at three?"

Ryan blinked. "Did I?"

"You did," Callum said. Very calm. Completely certain.

Ryan looked at his phone, shrugged, and eventually the conversation drifted somewhere else and Nadia found herself no longer talking to Ryan at all.

She stared at the side of Callum's face.

He did not look at her.

Later, when everyone had moved to the living room and she was alone in the kitchen refilling her glass, he came back in.

"Did you just do that on purpose?" she asked.

"Do what?"

"You know what."

He leaned against the counter and looked at her with that unbothered expression she was beginning to find genuinely infuriating.

"Ryan talks a lot," he said. "I was saving you the trouble."

"I did not ask to be saved."

"Noted," he said.

He pushed off the counter and walked back out.

Nadia stood there for a moment, glass in hand, feeling a kind of irritation that was warm at the edges in a way it absolutely should not have been.

She put that thought away immediately.

---

That night Callum sat on the roof outside his window — something he had done since he was seventeen whenever the inside of his head got too loud — and called Marcus.

"She has been there four days," Marcus said.

"I am aware."

"And?"

"And nothing. It is fine."

Marcus was quiet for a second. "You are on the roof, aren't you."

Callum said nothing.

"Cal. You only go on the roof when something is eating you."

"It is a nice night."

"It is literally cloudy."

Callum looked up. It was, in fact, completely overcast.

"Go to sleep, Marcus," he said.

"You should talk to her. Just — tell her you know her. From before."

"There is nothing to tell."

"You thought about that girl for a year."

"Goodnight, Marcus."

He hung up and sat in the grey dark and listened to the house below him. A light was still on in her room. He could see the thin line of it under the gap at the bottom of her curtains from where he sat.

He stayed out there longer than he needed to.

He told himself it was the fresh air.

---

The next morning she found her favourite coffee — the specific one she had brought from her old house, tucked at the back of the cupboard — moved to the front shelf.

Right at eye level. Easy to reach.

She stood there looking at it for a moment.

Then she made her coffee and sat on the counter and did not say a word about it.

But she thought about it for the rest of the day.

By the end of the first week Nadia had a system.

Avoid the hallway between seven and seven thirty because that was when he came out of his room looking like sleep had not quite finished with him yet and he was somehow worse like that — less guarded, quieter, the sharp edges of him softened in a way that was inconvenient to witness.

Avoid the living room after ten at night because he had a habit of sitting there in the dark with just the lamp on, reading or on his phone, and the house got too quiet at that hour and quiet made her notice things she preferred not to notice.

The kitchen in the morning was unavoidable. She had accepted that.

Everything else she could manage.

She was doing well, she thought. Considering.

Then Saturday happened.

---

Saturdays, she learned, were when the house filled up.

Daniel had his own friends. Her mother had already made friends with two women from the street. And Callum's people drifted in and out with the ease of people who had been doing it for years — Jasper first, then Priya, then Ryan again, who came in through the back door without knocking like he had done it a thousand times.

Nadia was in the garden when Ryan found her.

She had discovered a small corner near the back wall where someone had left an old wooden chair and she had claimed it quietly as hers, sitting there with her book and the late morning sun.

Ryan dropped into the grass beside her without being invited, which she found she did not actually mind.

"What are you reading?" he asked.

She showed him the cover.

"Any good?"

"It is the third time I have read it so yes."

He grinned. He had an easy grin, uncomplicated in a way that was genuinely pleasant after a week of trying to decode Callum's expressions. They talked for a while — nothing heavy, nothing loaded, just two people passing time in a garden on a Saturday.

She had almost relaxed completely when the back door opened.

She did not have to look up to know who it was. She felt it.

Callum came out with two drinks, handed one to Ryan without being asked, and then looked down at Nadia's empty hand.

A pause.

"Do you want one?" he asked.

"I am fine," she said.

He went back inside.

He came back two minutes later with a glass and set it on the arm of her chair without a word and sat down in the grass on her other side and said something to Ryan about something she was not listening to because she was staring at the glass he had just placed beside her hand.

She had not asked.

He had not explained.

She drank it and said nothing.

---

Ryan left first.

Before he did he stopped beside Nadia's chair and said, "We should do something next weekend. A few of us, maybe."

"Maybe," she said.

"I will text you." He glanced at Callum. "I'll get her number from you."

"I will give it to him myself," Nadia said pleasantly.

Ryan laughed, took her number from her directly, and left through the side gate.

The garden went quiet.

Priya had gone inside. Jasper was somewhere in the house. It was just the two of them and the sound of someone's lawnmower three gardens over.

"You do not have to go everywhere he suggests," Callum said.

His voice was easy. Conversational. Like he was commenting on the weather.

Nadia turned her head and looked at him.

"Excuse me?"

"Ryan is a good person," he said. "He is also someone who loses interest quickly. I am just telling you so you know."

She stared at him.

"You are unbelievable," she said.

He looked back at her with that perfectly level expression. "I am looking out for you."

"I did not ask you to look out for me."

"No," he agreed. "You did not."

"Then stop."

He said nothing. Just looked at her in that way he had — like he was listening to something she was not actually saying.

She got up and went inside and did not look back.

---

She found Priya in the kitchen, which was convenient because Priya was exactly the kind of person Nadia needed right then — observant, direct, and unlikely to sugarcoat anything.

"Can I ask you something?" Nadia said.

Priya looked up from her phone. "You want to know about Callum."

Nadia blinked. "Is it that obvious?"

"You have that specific face people get." Priya set her phone down. "What did he do?"

"He told me Ryan loses interest quickly. Out of nowhere. Like it was a public service announcement."

Priya was quiet for a moment.

"What?" Nadia said.

"Nothing."

"That is not a nothing face."

Priya picked her phone back up. "Callum does not usually comment on who his friends talk to."

"Well he commented on me."

"Yes," Priya said simply. "He did."

She did not say anything else and Nadia had the distinct feeling she was being given information without being given information, which was somehow more frustrating than knowing nothing at all.

---

That night Nadia could not sleep.

She lay in the dark and replayed the garden and the glass on the arm of her chair and the way he had sat beside her without being asked and the way his jaw had gone tight when Ryan smiled at her and she thought about all of it in a loop until she was exhausted and annoyed at herself for thinking about it at all.

She got up for water around midnight.

The hallway was dark. She moved quietly, not wanting to wake anyone.

She was halfway down the stairs when she heard it — music, low and almost inaudible, coming from the living room.

She stopped.

She should have kept walking.

She did not.

She leaned just slightly past the wall and looked.

He was on the couch in the dark, one lamp on, and he was not reading and he was not on his phone. He was just sitting there. Still in a way he never was during the day. Like the version of him that existed at midnight was a different person entirely — quieter, less constructed, something underneath the composure finally allowed to breathe.

She watched him for four seconds.

Then she went and got her water and went back upstairs without making a sound.

She sat on the edge of her bed and thought about his face in the lamplight and how it looked like someone who was carrying something he was not telling anyone about.

She told herself it was not her business.

She also did not sleep for another hour.

---

Down the hall, Callum turned the music off and sat in the silence.

He had not heard her on the stairs.

But he had felt the shift in the house that happened when she was nearby — some subtle change in the air that he hated himself a little for recognizing.

He put his head back against the couch.

Three weeks ago his life had been uncomplicated.

He was going to need a better system.