"Damn it! I'm not a big sister!"
Rimuru sat miserably in the corner of the room, repeatedly pounding the table in front of him as he wailed in anguish.
Earlier, under the overwhelming pressure of Milim's strength, he had been forced to comply with Shirou Emiya's request and call him big brother. Immediately after that, Milim had happily bestowed upon him the title of Sister Rimuru.
At the time, when Milim called him that, it felt strangely... nice.
But once the moment passed, only regret remained.
In this life, Rimuru's physical proof of being male had already disappeared. He was a completely genderless being now. The only thing allowing him to maintain his sense of being male was how he referred to himself.
And now, even that last line of defense had been mercilessly stripped away by Shirou Emiya.
From this point on, no one would ever think he was a boy.
Damn it!
"Premium secret recipe cake. Would you like a taste?"
"Just to be clear, only my little sisters and subordinates are welcome. Other irrelevant personnel will be ignored."
"Shirou Nii-san, I'm coming!"
The moment the rich aroma reached his senses, Rimuru abandoned all dignity.
Without even a second of hesitation, he shouted "Nii-san" and rushed forward, immediately joining Milim in a fierce struggle over the cake.
"Ah!"
"It's so good!"
As the cake entered their mouths, an indescribable sweetness spread across their tongues. A moment later, everyone in the room fell into the illusion brought on by the dessert.
Time seemed to stop.
The room fell silent, filled only with blissful expressions as everyone unconsciously held their faces, savoring the moment.
"Mmm... it really is delicious. Much better than before."
Shirou Emiya tasted the cake he had made and smiled with genuine satisfaction.
Compared to when he had taught Edelweiss how to make desserts, his cooking skills had clearly improved by a large margin. Just like his strength, his culinary ability continued to grow steadily.
When he thought about making desserts, the first thing that came to mind was the cake he had researched while practicing with Edelweiss.
Now that he tasted it again, it truly was as delicious as ever.
"Let go! Milim, that's my cake!"
"Why are you eating so slowly? If you don't like it, then let me eat it!"
"Who doesn't like it!? I love it! I just want to savor it!"
"Aren't you my big sister? Why can't you let your little sister have it!"
"Hah! Today, this big sister will righteously eliminate her own family!"
Listening to the sudden quarrel between Rimuru and Milim, Shirou Emiya couldn't help but laugh.
At this moment, judging purely by his behavior, Rimuru looked nothing like the 'manly' figure he believed himself to be.
"This is exactly how it should be."
"No matter what you were in your past life, male or female."
"In this life, I'm raising you as a girl."
"Anyway, you don't even have a gender anymore."
Watching the two bicker like children over a piece of cake, Shirou Emiya's eyes were filled with contentment.
Compared to a little sister, what was a little brother worth?
I, Emiya the Great Hero, only raise little sisters.
"All right, stop fighting," he said casually. "You can have my piece."
Already accustomed to his own cooking, Shirou Emiya immediately handed over his share of cake.
"Yay! Shirou Nii-san!"
"Big brother is the best!"
Hearing the cheerful thanks of his little sisters, Shirou Emiya's smile widened further.
Little sisters.
They really are the best.
...
After the dessert tasting ended, Rimuru planned to take Milim on a tour of the town.
He wanted her to properly see the city and appreciate its beauty.
However, just as they stepped out of the Town Hall, they ran into Gabiru, who had come to deliver recovery potions.
After forming an alliance with the Dwarf Kingdom, Dwarf King Gazel had sent the former minister Vesta to assist with the city's construction. Though there had been some friction at first, Vesta was an exceptionally rare research talent.
Rimuru arranged for him to collaborate with Gabiru.
One focused on cultivating medicinal herbs.
The other researched how to naturally reproduce the perfect recovery potions that only Rimuru had been able to create before.
Now that they had achieved preliminary results, Gabiru excitedly brought the prototypes to report.
"Oh, isn't that Lord Rimuru? Perfect timing. The prototypes are finished, so I brought them."
Seeing Gabiru approach, Rimuru immediately understood that there had been progress.
Milim, seeing someone who was both Shirou Emiya's acquaintance and Rimuru's subordinate, laughed loudly.
"Oh? A Dragonewt? Wahahahahaha! That's rare. Have you been working hard?"
"Huh? I don't think I've seen you before."
Gabiru puffed out his chest proudly.
"I am Gabiru, a Dragonewt! As Lord Rimuru's trusted confidant, I am responsible for developing secret medicines. Are you a new member, little one?"
Splat.
"...Huh?"
Milim's smile vanished instantly.
"What did you just say?" she asked softly. "Little one? Are you calling me that?"
She stepped forward.
Grabbed Gabiru by the head.
Pulled him toward her.
Then punched him straight in the stomach.
Neither Shirou Emiya nor Rimuru had time to stop her.
Not that they were worried.
With a heavy thump, Gabiru's body was sent flying.
"Listen carefully," Milim said calmly. "I'm in a good mood today, so I'll forgive you with just one punch."
She smiled brightly.
"But next time, I won't be so kind."
If she had punched him one more time, Gabiru would have died on the spot.
Calling that forgiveness was generous.
It was nothing more than precise control of her strength, stopping just short of the line between life and death.
This girl... Milim was terrifying.
She had probably used her Dragon Eye to judge Gabiru's durability beforehand.
Looking at Milim's cheerful smile, Rimuru shivered.
Fortunately, what Gabiru had brought was a prototype recovery potion.
Rimuru quickly went over and used it.
As expected, Gabiru's injuries vanished almost instantly.
"Puhaha! I thought I saw Father waving to me from across the river!"
Despite barely regaining consciousness, he still managed to crack a joke.
Shirou Emiya chuckled.
"Putting aside how energetic you seem, your father should still be alive, right?"
This kid really was a filial son.
Realizing his mistake, Gabiru hurriedly corrected himself.
"Ah-right. My apologies. But I really almost died just now. So, who is that... ah, no-who is that young lady?"
"Oh, right," Rimuru said. "Souei said he'd inform Rigurd, but you were in the cave, so you didn't hear."
"This is Milim. And apparently... she's a Demon Lord."
"Huh!? A Demon Lord!?"
Gabiru's face went pale.
"So be careful with what you say from now on," Rimuru added. "She'll probably be staying here for a while."
"I see! No wonder her punch was so strong! I angered a Demon Lord and I'm still alive!"
"Don't worry," Shirou Emiya said, patting Gabiru on the shoulder. "Milim knows how to control herself."
"You should head back first. I'll come to the cave later to check on you and Vesta."
"For now, we need to introduce Milim to the citizens."
Rimuru made the arrangements with a tired sigh.
Considering what might happen if Milim wandered the city alone, this was the safest option.
"Understood!"
Gabiru wasted no time and quickly disappeared down the street.
"Then let's go too."
Shirou Emiya smiled and patted Rimuru's shoulder.
"Let's introduce our little sister Milim to everyone in the city."
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