Became Pregnant With the Demon King’s Child

Clang. The sound of a spoon dropping to the floor rang out. Since the atmosphere had been quiet and restful, everyone’s attention immediately turned toward the source of the sound.
“I’m sorry!”

Robin, who had been standing blankly, flinched and quickly set down the teacup in his hand. He seemed to have dropped the spoon while adding sugar to the tea meant for Lowell. The problem was, this wasn’t the only mistake Robin had made today.
He brought the wrong clothes, burned his tongue while eating, cut his hand on paper... I think he made more small mistakes than I can even count.
In short, it meant he was acting like his mind was somewhere else.

“It’s all right. A little tea splashed, but are you hurt anywhere?”
Lowell waved his hand at Robin, who was flustered and at a loss. Normally, if he had the energy, Robin would have laughed off this kind of mistake and lightened the mood with a joke—but today, he wasn’t able to at all.
Just the Crown Prince leaving wouldn’t be enough to make him like this...

Narrowing his eyes, Lowell tried to deduce the cause of Robin’s strange behavior. Judging by the way he picked up the spoon and cleaned the floor, he seemed relatively fine again. Lowell was wondering whether to just ask him directly when—
“So passionate.”
Felix, who had been sitting nearby, suddenly spoke to Lowell in a curt tone.

“Sorry?”
Lowell, who thought Felix was focused on his documents, blinked and looked at him. But Felix had long since set the documents aside and was watching Lowell—watching him look at Robin with concern.
“You look at other people so passionately. Someone might get the wrong idea.”

Lowell blinked, then slowly rubbed the back of his reddening neck.
You know I don’t have any feelings for Robin...
Robin had been brought by the Crown Prince and was an omega. He was a pretty boy, yes, but when it came to practical concerns, Felix had far fewer things to worry about than, say, Zephyros.

If anything, I’d be the one to get jealous, not Felix.
Lowell set down the book in his hands and met Felix’s gaze. Felix, perhaps realizing how awkward his own words had been, began moving his pen again—but it was clear from the meaningless doodles he drew that his attention was elsewhere.
“You won’t misunderstand, Felix, so it’s fine, right?”

Lowell deliberately stressed the word misunderstand, and the strength in Felix’s grip on the «N.o.v.e.l.i.g.h.t» pen slackened. It wasn’t that he truly suspected Lowell or that Lowell’s answer reassured him. He was simply disarmed by the tone—teasing but comforting—that said, “There’s nothing to worry about.”
“As long as it doesn’t go too far.”
Felix stepped back. Lowell gave him a smile, then turned to look at Robin again. He was still staring off into space, seemingly unaware they’d been talking about him. It was obvious to anyone that something was wrong.
He’s not sick or anything, is he...?

If he’d fallen ill the moment the Crown Prince left, that wouldn’t make much sense. But Robin was fundamentally healthy and didn’t appear to have a fever.
Well, if it’s serious, he’ll speak up eventually.
Lowell decided that Robin wouldn’t be able to handle sword training in his current state and resolved to at least discuss only the relevant parts with him.

For now, let’s not worry about it.
Unfortunately, this resolve wouldn’t last long.
***

While Felix was off training, Lowell decided to take a light walk. Robin insisted on following him, despite Lowell saying he could stay inside.
Will he be all right?
As expected—he wasn’t. At first, once they were outside, Robin seemed to regain some focus, but soon enough he began to stagger, and then his steps became unsteady.

He’s going to cause an accident at this rate...
Lowell looked at Robin like one might look at a child near water, while the escort knights also watched nervously. Sure enough, Robin didn’t notice the icy patch ahead and nearly fell.
“Robin!”

Lowell, already on edge, instinctively reached out his hand—but without much physical strength, he nearly fell himself. Thankfully, the escort knights had been on standby and supported them both, preventing any mishaps.
“Ah! That was close. I’m so sorry.”
Robin bowed his head with a sheepish expression. Lowell let out a deep sigh from the bottom of his chest.

“Robin, ‘sorry’ just isn’t going to cut it anymore. Go back and get some rest now.”
“Excuse me?”
“Do you even realize how dangerous you’ve been all day? I don’t care how many small mistakes you make. But right now, you’re a safety risk. Go back to your room, get some rest, and assess your own condition. If you want to do something, find your stability first.”

Lowell added, worried he’d sounded too cold.
“If you need to talk, I’m always willing to listen.”
“...Thank you.”

Robin wiped the forced smile off his face for the first time all day and answered honestly. That alone reassured Lowell.
So he does know how serious his condition is. If he’s aware of the problem, something can be done about it.
That little non-incident ended their walk earlier than planned. Back at the main residence, Lowell organized his clothes in the study and called Hamilton to receive a report on what had happened at the ducal estate over the past week. At first, he felt awkward about being treated like the duchess, but Hamilton insisted firmly.

“There were no other notable events. Also, His Grace asked to summon the tailor.”
“The tailor?”
“He said your clothes seem uncomfortable.”

Now that it was mentioned, the clothes that had been deliberately ordered a bit loose did feel snug recently. His pants still fit fine, but his tops were now tight due to some belly growth.
“You can just buy new ones off the rack. No need to call the tailor.”
“I will have him arrive by the end of the week.”

It was rare for Hamilton—who never refuted Lowell’s words—to respond so firmly. Since it wasn’t uncomfortable enough to protest, Lowell let it go.
“Thank you.”
“Not at all. I’ll take my leave.”

Once Hamilton left, Lowell slumped onto the sofa. He’d planned to tour the estate, but he simply didn’t have the energy.
I was always a mess, but it’s definitely worse now...
He meant to just rest his eyes, but ended up falling asleep. It was such a light sleep that the moment someone tried to drape a blanket over him, he opened his eyes.

“Felix?”
He rubbed his eyes and called the name that came naturally. The figure startled and trembled.
“Ah, I woke you? I was just going to cover you with a blanket...”

It was Robin, who had returned after supposedly going to his room. Sitting up, Lowell frowned faintly.
“I told you to go rest. Why are you here again?”
Half-asleep, his concern came out bluntly.

“After cooling my head, I realized there was something I wanted to say.”
“To me?”
Lowell had told him to talk, but he hadn’t expected someone he barely knew to open up, so he was a bit surprised.

“Yes. I thought talking to you might help me feel better.”
“Is that so?”
Robin probably didn’t know—but instinctively, he’d picked someone who seemed likely to listen well.

So he’s got good instincts for picking a counselor, too.
Looking out the window, Lowell saw the sun beginning to set. The hazy moon peeked out from where it had been hidden.
“Shall we talk outside, then? The room is too warm—I keep dozing off.”

The two stepped out and walked in silence for a while. Robin was choosing his words, and Lowell was waiting for him to speak.
“I’ve been completely out of it all day, haven’t I? I’m sorry.”
“As I said, that’s fine. His Highness must’ve said something, didn’t he?”

“How did you know?”
Robin stopped walking.
“I just couldn’t think of anyone else who could trouble you that much.”

“Oh… I see.”
Robin stared blankly at the snow-covered mountains in the distance, then finally spoke.
“His Highness said he’s going to make me the Crown Princess(*).”

Lowell’s jaw dropped. That certainly was something to be shocked over.
Originally, he wouldn’t say a word—he’d make all the preparations himself and then order people to obey. Is this a butterfly effect too?
He swallowed hard.

 
TL Note:
(*) In Korean, the term used here is 황태자비 (hwangtaejabi), which literally means Crown Princess, the title traditionally given to the wife of the Crown Prince. Although Robin is male (and an omega), the title is used as a formal court designation, not necessarily reflecting gender but rather the social and political role. The Crown Prince deliberately uses this term to assert Robin’s intended position as his official consort within the imperial hierarchy. Despite its feminine form, it remains untranslated to preserve the nuance and shock value in context.