At the beginning, Shirou hadn't approached Morgan with any ulterior motives.
He was simply driven by the intense desire to "make Morgan happy!" But as they spent time together, he gradually became captivated by her charm.
By the time he came to his senses, Shirou had already done everything he should and shouldn't have done.
The moment he opened his eyes, what greeted him was a striking pair of soft, full peaks, like two plump, snow-white fruits resting right before him.
As his gaze moved upward, he saw her delicate collarbones and slender neck, and finally, a face that combined innocence with a bewitching allure.
Morgan blinked, then smiled gently.
"Mm~♡ You're awake, my husband?"
Shirou's lips twitched.
"G-good morning… Onee-sama."
Why are you using honorifics?
Morgan's brows knit slightly.
"Never mind that. More importantly, did I satisfy you properly last night?"
"Although I have some confidence in my body, if there was anything lacking in how I served you, you must tell me."
"Don't hold back. After all, whether as your wife or your older sister, serving you is only natural for me, isn't it? Hehe~♡"
He had plenty he wanted to say, but all of it vanished as Shirou buried his face in Morgan's chest.
"Oh my… honestly♡ Shirou, really, it's already morning! You can't keep acting spoiled like this!"
"Hehe, I just can't help it… but before the maids arrive, only one more time, alright?"
"Hurry up and put it in… mmh♡"
After enjoying their sweet time as newlyweds, the two finally calmed down and began discussing their plans for the future.
Morgan stated that she would remain in Orkney as queen consort, while Shirou should return at once to Uther and Merlin.
"Don't misunderstand, my dear brother… I'm not asking you to part ways with me."
"On the contrary, this is preparation so that we can stay together forever in the future."
What Morgan meant was that the two of them would act separately for now, each advancing the unification of Britannia on their own, and reunite once the time was right.
This way, they could deceive Uther and Merlin, while also confusing the other factions.
That brought them to the question of what to do with King Lot.
The man who was supposed to become Morgan's husband had been ambushed by Shirou last night, and was currently locked inside the wardrobe of the adjacent guest room.
"Hmm? While Shirou isn't here, I can just let King Lot act as my husband, hehe… what's that look for?"
"Didn't you say you don't mind if I'm held by another man? I'm joking. I belong only to you."
Morgan proposed killing King Lot, but Shirou suggested simply imprisoning him somewhere.
With Morgan's level of Magecraft, that wouldn't be difficult. After all, she was a genius Magus capable of sealing even Merlin.
Then, Morgan revealed something she had been hiding all along.
"I never told you because I was afraid you'd hate me."
"There are actually three personalities inside me. One is…"
"I've known for a long time."
"…You knew all along… huh? Huh? Huh?!"
Morgan stared at him in shock, while Shirou continued calmly.
"I've known for a long time."
"All these years, there have always been three older sisters taking care of me."
"One is the princess persona. The older sister who dotes on me the most, Morgan."
"Another is the Lady of the Lake persona, Vivian, who watched over my growth and wanted to guide me to become the King of Britannia."
"And the third is the wicked witch persona, Morgan le Fay. The one who desires to dominate Britannia, eliminate all obstacles, and then live a shameless life with me."
"And that's you, the one talking to me right now. Am I wrong?"
"......"
Morgan le Fay's face flushed bright red.
"H-how do you know all that so clearly? You even know about me!"
"When it comes to my own woman, of course I know everything."
Overcome with embarrassment and frustration, Morgan le Fay grabbed a pillow and smacked Shirou on the head.
"If you knew, you should've said something sooner, idiot!"
In short, there were three personalities residing within Morgan.
Unlike ordinary cases of multiple personalities, these three could switch seamlessly at any time, making it impossible for outsiders to notice.
Yet in reality, their personalities and temperaments were completely different.
However, they all shared one thing in common.
They deeply loved Shirou.
"Being loved by three older sisters… I might be the happiest little brother in the world."
Shirou said this with a smile, while Morgan could only feel unbearably embarrassed.
"So you really did know everything, Shirou. I think I understand why Merlin chose you."
"No. That's the one thing Merlin got wrong."
"What do you mean?"
Shirou replied,
"I don't think I have what it takes to be a king who rules Britannia."
Morgan frowned slightly.
"You really like putting yourself down, don't you, Shirou?"
"No. I'm not talking about ability."
Shirou didn't believe he could resolve himself to live entirely for the sake of the nation and its people.
Saving all living beings… that idea was far too grand. To him, it felt distant, like a castle in the sky.
All he wanted was simple.
To make one girl he cared about happy. Nothing more.
"Mmm… if that's your wish, then you've already achieved it, haven't you?"
Morgan leaned in, nestling into Shirou's arms as she murmured softly,
"I'm already very happy, Shirou."
Even so, Shirou couldn't ignore the current state of Britannia. He couldn't stand by while innocent people suffered.
"So I'll do everything I can to support Morgan-nee-san and make you the greatest queen!"
"Mmm… I'll do my best not to disappoint you, Shirou."
Morgan clenched her fists.
"Then what should I do? Is there anything I can do right now?"
"Let me think… something Morgan can do right now… ah, right… have a child."
Smack!
Morgan tapped Shirou on the head, her face flushed as she snapped,
"We're discussing something serious here!"
"I am being serious."
Shirou explained that the children Morgan would bear as a mother would undoubtedly be exceptional.
Gawain, Agravain, Gaheris, Gareth, and Mordred. Nearly half of the Knights of the Round Table were Morgan's children.
In the near future, those children would become key support in their rule over Britannia, so Shirou wanted Morgan to follow the original storyline and give birth to them.
"What you're saying, Shirou… it sounds like some kind of prophecy from the Age of Myths."
Morgan lightly held her delicate chin as she murmured,
"If this were just a lie you made up to trick your sister into giving you her body, it would be a bit too exaggerated."
"I'm not lying! It's all true! And I can't be the father of those children. Except for Mordred!"
"Why?"
"I'll explain that later…"
Shirou continued,
"In any case, Morgan-nee-san's first four children can't be mine."
"And of course… finding another man is absolutely. not. allowed! Not allowed means not allowed!!!!"
"…You're such a handful. Fine, fine."
Morgan stroked Shirou's hair as he buried himself in her arms, acting spoiled, while nodding with a slightly serious expression.
"Alright, I understand. I'll give it a try. It really is an interesting idea. But…"
She cast a deep look at the red-haired boy, a seductive smile forming on her lips.
"You'll be helping too, won't you. My dear little brother."
And just like that, Shirou became the provider for Morgan's "Knights of the Round Table Creation Project."
One month later.
Using an egg provided by Morgan, genetic fragments were extracted from Shirou's sperm.
Then, through Magecraft, the two were processed and fused, creating the very first test-tube child.
That child was named Gawain.
...
Under Shirou's deliberate guidance, everything seemed to proceed along the original course of history.
Shirou returned to Merlin's side to continue his studies, while Morgan took the place of the imprisoned King Lot and became the de facto ruler of Orkney.
Morgan publicly severed ties with her father, Uther, declaring herself the true King of Britannia, and began expanding her forces from north to south.
After conquering large swaths of land, people began to call her the Fairy Queen.
Feared by all for her Magecraft and cunning, the Fairy Queen carried a secret no one knew.
Once every month, she would leave her stronghold and secretly meet with Shirou, the son of her sworn enemy.
King Uther was defeated by his younger brother Vortigern and passed away six months after Morgan married into Orkney.
Vortigern was the one who brought the Saxons onto the island, plunging Britannia into chaos and war.
To defeat Uther, he willingly drank dragon's blood and turned himself into a monster, the Usurper King.
More than that, Vortigern became the embodiment of the island's rage.
Britannia had once been a land of mystery and fantasy, but as human activity increased, it steadily declined.
Now, the will of the island itself had turned against humanity in vengeance.
On the other side, Shirou steadily followed the path of Artoria from the original story.
After Uther's death, Shirou became the adopted son of the knight Ector.
To evade Vortigern's pursuit, he changed his name to Artorius.
At the age of eighteen, Shirou completed the task assigned by Merlin, the most famous political spectacle in human history.
He successfully drew the "Sword of Selection," said to be wielded only by the true king.
Just the night before, he had been tangled up with a witch, going at it over and over again, and the very next morning he was chosen by the Sword in the Stone. Seriously?
This had to be a prearranged setup. I'm the only one who can pull it out, right?
After that came a three-year journey of pilgrimage.
Shirou, Merlin, and his foster brother Kay traveled across Britannia.
At times they upheld justice. At times they punished evil.
And naturally, there were also their ongoing clashes of wit and strategy with their sworn enemy, Morgan, at least on the surface.
During their travels, they encountered a white puppy known as the Three-Eyed Cat Demon. Even a monster of overwhelming strength couldn't defeat it despite giving its all, and in the end, they subdued it using catnip.
The final stop of their journey was the lake region.
"You are an honest child. As a reward, accept this golden sword and its invincible scabbard."
"Wait, I didn't drop anything into the lake though?"
From Merlin's disciples, the fairies, Shirou obtained the Holy Sword of the Planet, Excalibur, along with its scabbard, Avalon.
At some point, knights began to gather around Shirou. The now-grown Gawain and Agravain also joined their ranks.
With Merlin's relentless promotion, the title of the King of Knights gradually became known throughout the land.
On one side, the Saxons under Vortigern continued to ravage the island like an endless calamity.
On the other, Morgan spent years conquering the Picts, fully unifying the north, and now cast her gaze toward southern Britannia.
With both internal strife and external threats pressing in, the people began placing their hopes in Arthur, Shirou, hailing him as the savior of Britannia.
One day, Merlin forcibly handed Shirou the Holy Lance, Rhongomyniad.
"My King! You now wield both the Holy Sword and the Holy Lance! There's no time to waste. Hurry and defeat Vortigern! Let's go!"
Shirou was dragged off by Merlin toward the battlefield where he would face the Tyrant King.
Ah… being a king really is exhausting. Shirou found himself deeply missing his older sister's lap pillow.
...
...
"Holy Lance, release restraints!"
"Rhongomyniad!!"
"■■■■■■■■■■■■■■■!!!"
…
…
"I didn't expect even Rhongomyniad to be brought out… what a pack of fools. In trying to overthrow a tyrant, they've only invited even greater destruction."
By the time Shirou came back to himself, it was already the victory scene. You've got to be kidding me.
In the steady drizzle, the black dragon pierced through by the Holy Lance shattered apart, its massive body collapsing as it reverted to the form of an old man in black robes.
"Child of my brother Uther… you cannot save this country."
"You cannot lead humanity to victory, because… the Age of Mystery has long since come to an end."
The Vile King, Vortigern, murmured weakly.
"What comes next is the age of civilization. The age of mankind."
"The power rooted within you cannot coexist with humanity. As long as you continue to exist, Britannia has no future."
"Curse it. The Britannia of old has already perished."
Shirou pulled the lance free from the old man's body. The old man let out a dreadful laugh that seemed capable of shaking a fortress, before crumbling away into dust.
And just like that, with the fall of the Vile King Vortigern, the week-long rain came to an end, and the dark clouds finally cleared.
Sunlight, long absent, once again shone upon the land of Britannia. Gawain returned to his state of triple strength.
"The enemy commander has been slain!"
Shirou raised the Holy Sword high, declaring victory amid the knights' cheers.
At last, the long and chaotic civil war of Britannia came to an end.
The Picts had already submitted to the Fairy Queen.
With the Tyrant King gone, the Saxons gradually retreated back to the continent.
It's about time… time to tell everyone the truth about my relationship with Morgan.
Recently, Shirou had begun to feel dissatisfied with meeting Morgan only once a month in secret.
Sneaking around behind everyone's backs did have its thrill, but more than that, he wanted to show off his adorable wife openly.
Just as Shirou was thinking about how to explain everything, Merlin appeared, bringing a young woman with him.
"Nice to meet you. My name is Guinevere."
…Crap. I completely forgot about this.