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English
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Part 1 of Advent '25 , Part 38 of 31 Days of Jimmas 2025
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Kirk/Spock Advent Calendar 2025
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Published:
2025-12-24
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2025-12-24
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9,807
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4/4
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Something Theirs

Summary:

Jim finds out he's pregnant while in Iowa with Spock off on New Vulcan.

Notes:

Prompt:

Kirk realizes he’s pregnant while stuck home in Iowa for the holidays, and Spock isn’t there with him to help him process (or celebrate) that news. I want family angst to the max—being around his mom makes Kirk wonder about his own ability to be a parent, maybe he starts to doubt himself and fears that he’ll repeat her mistakes. I’d love it if Kirk holds off on telling Spock for a little bit to add more drama, with Spock wondering why Kirk seems off either through the bond or over their comms calls, maybe fears that Kirk is going to break up with him.

Your choice if it’s a surprise or if they’ve been intentionally trying and this is the first positive they’ve had. I’m picturing AOS in order to dive into Kirk’s rocky relationship with his mom and stepdad, but would enjoy a TOS take on this idea, too. Any rating. Bonus points if there’s some Kirk & McCoy moments, love their friendship.

Chapter 1: Snow Falls in Iowa

Chapter Text

The bathroom was too bright. Jim had never noticed that before — how the overhead light gleamed off the white tiles, making everything feel sterile and exposed. He sat on the edge of the tub, staring at the test in his hands.

Two lines. Clear as starlight.

Pregnant.

He'd imagined this moment a hundred times during the past few months. He and Spock had talked about it late into the ship's night cycles, Spock's hand warm on his chest, speaking logically about genetic compatibility and the surprising ease with which Human-Vulcan conception could occur with modern medical assistance. They'd made the decision together. They'd tried together.

But in all those imagined scenarios, Spock had been there. Standing beside him, or sitting close enough to touch. Not 40,000 light-years away on New Vulcan, attending the Kal-t'shaya ceremonies that he couldn't possibly miss.

Jim set the test down on the sink's edge with a hand that trembled slightly. Through the door, he could hear his mother moving around in the kitchen, humming something off-key. The house smelled like pine and cinnamon — she'd gone overboard with the Christmas decorations this year, as if enough tinsel could make up for all the holidays they'd missed.

He should feel happy. He was happy. Wasn't he?

The bond at the back of his mind was quiet, muted by distance and the discipline Spock maintained during important cultural events. Jim was grateful for that right now. He didn't want Spock to sense the confusion churning in his chest, the way joy and terror were so tangled up he couldn't tell them apart.

"Jimmy? Breakfast is ready!" His mother's voice carried up the stairs.

Jim looked at his reflection in the mirror — still the same face, same body, though in six months, eight months, that wouldn't be true anymore. He picked up the test, wrapped it in tissue, and shoved it deep into his jacket pocket.

"Coming," he called back.


Winona Kirk had made pancakes, bacon, and eggs — enough food for a crew of five, though it was just the two of them. She'd always cooked like that, Jim remembered. As if Sam might walk through the door at any moment, even after he'd been gone for years.

"You're not eating," she observed, nursing her coffee.

Jim pushed scrambled eggs around his plate. "Not that hungry."

"You flew halfway across the galaxy to be here and you're not hungry?" She raised an eyebrow, a gesture that reminded him uncomfortably of Spock. "Must be serious."

"I'm fine, Mom."

She studied him for a long moment. Outside, snow was beginning to fall, dusting the fields that stretched out from the farmhouse. "Is it Spock? You two having problems?"

"No." The word came out too sharp. "No, we're good. Great. He's just busy with the thing on New Vulcan."

"The Kal... what was it?"

"Kal-t'shaya. It's a ceremony of memory. For the ones they lost." Jim took a sip of orange juice to avoid meeting her eyes. "He needs to be there."

Winona nodded slowly. "Must be hard, though. Being apart."

It was hard. Harder than he'd expected. They'd been separated by duty before — shore leaves on different planets, away missions that took one of them off the Enterprise. But this felt different. This felt like standing at a crossroads alone when he'd thought they'd walk it together.

"I'm managing," Jim said.

His mother's expression softened in a way that made his chest tight. "You know, when I found out I was pregnant with Sam, your father was off-planet. Some routine mission that was supposed to take a week. I sat in our apartment in San Francisco for twelve days before I could even process it."

Jim's fork clattered against his plate. "Mom—"

"I was terrified." She continued as if he hadn't spoken, staring out at the snow. "I didn't know the first thing about being a mother. My own mother had died when I was twelve, and Frank's mother..." She shook her head. "I kept thinking, what if I mess this up? What if I'm not enough?"

The words hit too close to something raw inside him. Jim stood abruptly. "I'm gonna take a walk."

"Jimmy—"

"I just need some air."

He grabbed his jacket from the hook by the door and stepped out into the cold before she could say anything else.


The snow fell in soft, fat flakes, already covering the ground in a thin white blanket. Jim walked without direction, hands shoved deep in his pockets, his right hand closed around the pregnancy test.

His communicator buzzed. He pulled it out, saw Spock's ID, and almost didn't answer. But that would raise more questions than he was ready to face.

"Kirk here."

Spock's face appeared on the small screen, composed as always, though Jim could see the slight tightness around his eyes that spoke of exhaustion. "Jim. I hope I am not disturbing you."

"Never." The word came automatically, sincerely. Just seeing Spock's face made something in his chest ease, made a smile come more easily to his face. "How are the ceremonies going?" he asked.

"They are... proceeding." Spock tilted his head slightly. "You appear distressed."

"I'm fine. Just cold. Iowa's freezing this time of year." Jim tried for a smile. "How are you holding up?"

"The rituals are emotionally taxing, but necessary." A pause. "Jim, I find myself concerned. Through our bond, I sense... disquiet. If you are experiencing difficulties, I would wish to—"

"I'm fine," Jim said again, too quickly. "Really. Just family stuff. You know how it is."

Spock's expression didn't change, but something flickered in his eyes. Doubt? Hurt? The distance made it hard to read him. "I see. If you are certain."

"I am. Focus on what you need to do there. We'll talk when you're back."

Another pause, longer this time. "Very well. I will contact you tomorrow."

"Okay. I—" Jim stopped himself, swallowing around the lump that had formed in his throat. "Talk soon."

The screen went dark. Jim stared at it, at his own reflection in the black glass. He'd just lied to Spock. Not a big lie, not really, but a lie nonetheless. A lie of omission.

He should have told him. Should have said, Spock, I'm pregnant, we're going to have a baby, remember how we wanted this?

But the words had stuck in his throat, trapped behind all the tangled fears he couldn't name. The tangled fears he didn’t want to acknowledge, not right now, not with Spock so far away, not with them parted the way they were.


That night, Jim sat in his old bedroom — unchanged since he'd left for Starfleet, still covered in old posters and models of ships. His mother had kept it like a shrine, or maybe like she'd always expected him to come home.

He took the test out of his pocket again, set it on the nightstand. Two lines, still positive. As if they might have changed.

His communicator buzzed with a message from Bones: How's Iowa? Found any corn you can tell your troubles to?

Despite everything, Jim smiled. He typed back: Hilarious. Having a great time.

Liar, came the immediate response. You never have a great time in Iowa. What's wrong?

Jim's thumbs hovered over the keypad. He and Bones had been through hell together. If anyone would understand, it would be him. But telling Bones before telling Spock felt like another betrayal, another secret.

Just family stuff, he typed. I'm fine.

You know I'm a doctor, right? I can literally hear when people are lying.

Then you know I don't want to talk about it.

A long pause. Then: Call if you need me. Even if it's just to complain about your mother's cooking.

Her cooking's the only good thing about being here, Jim sent back.

He set the communicator aside and lay back on his narrow childhood bed, staring at the ceiling. The same water stain in the corner, shaped like a bird in flight. He'd spent hours looking at it as a kid, imagining himself up there among the stars.

Now he was asking himself if he could be a father. If he had any right to bring a child into this life.

His mother's words echoed in his head: I didn't know the first thing about being a mother. I kept thinking, what if I mess this up?

And she had messed up, hadn't she? All those years of absence, of choosing her ship over her sons, of leaving them with Frank. All those missed birthdays and holidays and moments when Jim had needed her and she'd been gone.

He put his hand on his stomach — still flat, still unchanged. But underneath, a cluster of cells was dividing, growing, becoming something that would depend on him entirely.

What if he was just like her? What if Starfleet took him away, pulled him into the black, into the unforgiving darkness, and he left his kid behind the way she'd left him?

What if he wasn't enough?


The next morning, Winona found him in the barn. He'd gone out early, unable to sleep, and had ended up in the old building that smelled like hay and motor oil. His father's antique motorcycle was still there, covered with a tarp.

"You used to hide out here when you were upset," his mother said from the doorway.

Jim didn't turn around. "I'm not hiding."

"No? Could've fooled me." She stepped inside, closing the door against the cold. "Jim, talk to me. Please."

"There's nothing to talk about."

"Don't give me that." Her voice sharpened. "I know I wasn't around as much as I should have been. I know I failed you and Sam in a lot of ways. But I'm here now, and I can see that you're hurting."

Jim finally looked at her. Really looked at her. She'd gotten older — lines around her eyes, gray threaded through her hair. But her eyes were the same, still determined, still trying.

"Did you ever regret it?" The question came out before he could stop it. "Having Sam and I?"

Winona's face went pale. "What? Jimmy, no. Never. Not once."

"But you left." His voice cracked. "You left us with Frank, and you went back to space, and—"

"I made mistakes." She crossed the barn, took his hands in hers. "I made so many mistakes. I thought I was doing what was best, thought that keeping up a ship was the right way to honor your father, to provide for you and Sammy. But I should have been there. I should have chosen differently."

Jim pulled his hands away. "How am I supposed to know I won't do the same thing?"

"The same—" Understanding dawned in her eyes. "Oh, Jimmy. Are you...?"

He pulled the test from his pocket, held it out. The evidence of his future, his fear.

Winona took it with shaking hands, looked at the two lines, then at her son. "You're pregnant."

"Yeah."

"And Spock doesn't know."

"No."

"Why haven't you told him?"

Jim laughed, a broken sound. "Because I'm terrified, Mom. Because what if I'm a terrible father? What if I'm just like—" He stopped.

"Just like me," she finished quietly. She set the test down on the workbench, then pulled Jim into a hug — fierce and tight, the way she used to when he was small. "Listen to me. You are not me. You're not going to make my mistakes because you already know what they look like. You're aware in a way I never was."

"But Starfleet—"

"Starfleet doesn't have to take everything from you. You have choices I didn't think I had." She pulled back, hands on his shoulders. "And you have Spock. You're not doing this alone."

"I don't even know if I can do this. If I'm even ready."

"Nobody's ready. Being a parent isn't about being perfect, it's about showing up. And you, Jimmy — you've spent your whole life showing up, even when it was hard, even when it hurt." She smiled, eyes bright. "You're going to be an amazing father."

Something in Jim's chest cracked open. He found himself crying — really crying, for the first time since he'd seen those two lines — and his mother held him the way she should have years ago, the way she was here to do now.


That evening, Spock called again. Jim took it in his room, propping the communicator up so they could see each other properly.

"Hello, Jim."

"Hey." Jim tried to smile, but he could see from Spock's expression that it didn't reach his eyes.

"I must ask you something directly," Spock said, and there was something in his voice Jim had rarely heard — vulnerability. "Are you reconsidering our relationship?"

Jim’s heart lurched in his chest, dropping with untold weight into the pit of his stomach, "What? No! Spock, why would you—"

"You have been distant since I departed for New Vulcan. Your responses are abbreviated, your emotional state through our bond is turbulent and closed off." Spock paused. "If you wish to end our partnership, I would ask that you do so directly rather than—"

"I'm pregnant."

Silence. Spock stared at him through the screen, face completely still.

"I found out two days ago," Jim continued, words tumbling out now. "I wanted to tell you right away, but you were in the middle of the ceremonies, and then I started thinking about my mom and all the ways she wasn't there, and what if I'm like that? What if I can't do this? What if—"

"Jim." Spock's voice cut through his spiral. "Breathe."

Jim breathed.

"You are pregnant," Spock repeated, and now Jim could see it — the wonder breaking across his face, subtle but unmistakable. "With our child."

"Yeah."

"And you did not tell me because you were afraid."

"I'm terrified," Jim admitted. "I don't know if I can be a good father. I don't know if I can balance Starfleet and a family. I don't know—"

"Jim." Spock leaned closer to the screen, as if he could close the distance between them through sheer will. "I cannot predict what manner of parent you will become. However, I can state with certainty that you are the most capable, dedicated, and caring individual I have ever encountered. You lead with your heart, you fight for those you love, and you never abandon those who depend upon you."

"But my mom—"

"You are not your mother. You are yourself. And I will be there, every step of this journey, to ensure you need never face these fears alone." Something flickered in Spock's eyes — was he crying? "I had not anticipated feeling such joy while light-years away from you, yet I find I am... overwhelmed."

Jim laughed wetly. "Yeah?"

"Yes." Spock raised his hand, pressed his palm to the screen. "I wish I could be there with you now."

Jim pressed his own hand to the screen, matching Spock's fingers. "Two more weeks."

"Thirteen point four days," Spock corrected. "I will expedite my departure if possible."

"Don't rush the ceremonies on my account. They're important. Your parents needs you there."

"You are more important." Spock's voice was soft, certain. "You and our child. My mother agrees — she has been encouraging me to return to you since she deduced something was troubling me."

Jim smiled. "She’s got a sixth sense for things like that."

"I informed her this morning, after our conversation yesterday when I sensed your distress. She was... quite insistent that I contact you immediately." A pause. "She will be overjoyed, Jim."

"Tell her I love her," Jim said. "And that I can't wait to see her."

"I will. Though I suspect she will wish to tell you herself very soon." Spock's expression softened further. "I love you, t'hy'la. Never doubt that."

"And I love you." Jim's voice caught. "Come home soon?"

"As soon as I am able."

After they said goodbye, Jim sat in the quiet of his room, hand resting on his stomach. The fear was still there — it probably always would be. But now it was joined by something else. Something bright and warm and terrifying in the best way.

Hope.


Winona found him in the kitchen later, making tea.

"You told him?" she asked.

"Yeah."

"How'd he take it?"

Jim smiled — real this time, reaching his eyes. "He cried. I think. It was hard to tell, but I'm pretty sure."

His mother laughed. "That sounds about right." She paused. "You feeling better?"

"A little. Still scared."

"Good. Being scared means you care. It means you'll try." She took a mug from the cabinet, poured herself tea. "For what it's worth, I think you and Spock are going to be wonderful parents. Better than I was."

"Mom—"

"It's true. But I'll be a damn good grandmother. Make up for some of my mistakes." She raised her mug. "To new beginnings?"

Jim clinked his mug against hers. "To new beginnings."

Outside, the snow continued to fall on Iowa, covering everything in fresh white. In two weeks, give or take, Spock would be home. In eight months, they'd have a baby. And Jim would figure out how to be a father — imperfect, terrified, but trying his best.

It was all any of them could do.

The communicator buzzed. Jim picked it up, saw a message from Spock: I have been researching Human pregnancy. I have many questions and also several suggestions for nutritional supplements. When you are available, I would like to discuss nursery configurations. My mother has also begun compiling a list of names and wishes to know if you have any preferences.

Jim smiled so wide his face hurt. He typed back: Can't wait. Tell mom I'd love to hear her suggestions.

Through their bond, even across the distance, he felt Spock's presence — warm, steady, loving. Not going anywhere.

Jim placed his hand on his stomach again, this time without fear.

"Hey, kiddo," he whispered. "Your dads are gonna figure this out. Promise."

And for the first time since seeing those two lines, he believed it.