Author Notes: I like this chapter :) Enjoy!

Warning: Possible OOC-ness and some magic mumbo jumbo that I was just making up (and taking references from other fics). I was only focusing on the humour.

Disclaimer: I don't own Nasuverse or Harry Potter.

15 days after the...fateful day.

Archer was the first one to open his eyes and be able to see.

"Waaa hahahahahaHAHAHAHAAAHH - "

And the first thing he did after that was to point his finger at the almost bald, grumpy-faced baby in the next crib and laughed uncontrollably.

A few moments later, he noticed that his pointer finger was chubby.

Then, Archer finally realised that fuck, they were now twins.

So when Shirou could finally pry his eyelids open a few minutes later (because he hated to lose against Archer), the first thing that he ever saw was a bald baby clawing at his eyes and sobbing hysterically.

Molly came into their room not long after.

Her scent was familiar to the twins, halting their bawling (temporarily). For the first time in their lives, they could call someone 'Mother'. And today, they could finally put a face to the name.

She was of a Western descent, with pale skin and flaming fiery red hair. A little bit on the plump side but she was so kind-looking. Her warm brown eyes widened in surprise upon seeing her youngest boys interacting with their eyes wide open.

"Oh, my little boys. You could finally open your eyes!" she grinned, her eyes shining and suspiciously wet. Molly quickly strode to their cribs and lifted both of them on each arm. "I'm so proud of you!"

A warmth they'd never felt before settled in their heart.

'Mother,' they thought. Shirou chuckled, while Archer reached up with his hands to touch her face. 'Mother. We have a mo - '

Then, as if realising the blunder in their use of the word 'we', both reincarnated babies paused, turning to glare at each other.

"Aah!" Shirou cried. ('Mine!')

Archer shook his head, "Wah, ha'ah. Ah aah!" ('No, stupid. She's mine!')

(Both were still in a state of denial about their status as identical twins.)

Molly blinked, "Why suddenly - " Then, her eyes brightened in realisation.

"Aahh, you two must be hungry."

The twins looked up at her and frowned quizzically.

"Aah?" they asked in unison. Before they could process what she'd said, Molly put them in their respective cribs and started to pull down her collar -

"W-waaahhhh?!"

They flushed, quickly covering their eyes with their tiny palms. Obviously that didn't stop Molly to...to feed them.

It was universally decided that they were lucky to have each other to share their humiliation.

On the same day, they experienced and saw magic for the first time.

And it was nothing like what they'd expected.

Since their (re-)birth, they could only smell the unique scent of magic to prove its existence. Magic was everywhere. In the air, in the walls, in the wood of their cribs; in any items around them, really. It was jarring, but still not so uncommon, until they realised that their mother - the first human being they'd interacted with - was also full of magic. In fact, she had a magical core.

Every person in their vicinity had a magical core, including Shirou and Archer themselves.

Unless their current family had managed to hide themselves from the Mage Association, it was pretty obvious that the now-twins had just been reincarnated to a totally different world than their first.

They thought they would see their parents perform some awesome magics like breath dragon fire or perform time travel or transform into an animal or anything extraordinary. The twins did blast people off their feet moments after their birth, so they'd expected something big.

They'd never thought their mother would use magic to make them float, retrieve their nappies and vanish their...excretion, though.

Yes, it was still amazing that she could make them fly just by waving a stick and muttering some sort of a spell. Cleaning their nappies in a matter of seconds was convenient too.

It was just what the fuck.

...Forget about their experience with shits and nappies, please.

.

.

.

A few days later

Arthur Weasly, the twins' (current and biological) father, scratched his head.

"Which one is who again?"

Molly sighed exasperatedly.

She pointed at the baby on the left, "This one is Daniel." Then, she pointed at the other, "And this one is Joseph. Honestly, Arthur, you've got to be able to differentiate them."

The twins in question stared at their mother.

'I thought it's the other way round?'

They met their oldest and second-oldest brother on the next day.

Unfortunately, they - together with their father - came into the room when Shirou and Archer (they were still confused on who was Daniel and who was Joseph) were busy having a smackdown match.

(It started when Shirou slapped Archer's face out of blue. Shirou reasoned he could slap Archer around since the Servant was a jerk to Rin during the Fifth Holy Grail War, but, well, obviously he couldn't voice it out.

Admittedly, the slap was weak and awkward, and it didn't hurt a thing - it was more like a pat, really.

But it did piss Archer off.

Thus, the baby-wrestling duel.)

"D'aaaawwwwwww!" Arthur cooed. "They're so cute, hugging each other!"

Bill and Charlie nodded furiously. "I reckon it's a twin thing, since Fred and George are also literally inseparable," Bill reasoned.

They quickly left the room in confusion when the twins screamed at them and angrily pelted them with baby toys.

"Mummy?"

"Yes, darling?"

"Which one is Daniel?"

"He's that one, Charlie."

"Huh? I thought…Nevermind."

"You told us that was Joseph, Mum."

"I did?"

"How could you tell who's who? They look exactly the same to me."

"Well, Billy dear, Joseph is the older one while Daniel is the younger one."

Suddenly, the topic of the conversation wailed at each other, startling the three other Weasleys.

"Merlin! Why all of sudden - ?!"

"Are they hungry?"

Charlie squinted, "No...They look more like fighting each other."

"Over what? Toys?"

"I don't know."

That moment marked the start of a long dispute between the twins over who was Joseph and who was Daniel, until the Hogwarts letters came to put an end to it.

.

.

.

At first, the twins didn't know how to feel and act around Arthur Weasly.

He was their father, the real one in this world, but then there was also Kiritsugu.

The two were polar opposites. Kiritsugu, the Dad they'd remember, was kind, yet there was a sense of...emptiness in his eyes. He was sick, so he didn't move much. He was a loving father, yet it felt as if he wasn't living anymore. Kiritsugu lived for so long only to accompany Shirou and to go to Germany to fruitlessly try and save his daughter, Ilya.

Kiritsugu was dead, even when he was alive. And Shirou Emiya still loved him as a son who loved his father.

Arthur Weasly, on the other hand, was...alive. Like, bursting with life. Actually, he was closer to Taiga than Kiritsugu.

He was boisterous around his children, making funny faces here and there and giving them magical and Muggle toys (it was the first time the twins heard about the term for non-magical people). He always darted around whenever he was excited. He said he loves Muggles and their technology, yet from what the twins had seen, he couldn't use any of the Muggle-technology he'd discovered for nuts.

It was hard enough to call the man their father. But it was even harder for Archer than Shirou to call him 'Arthur'.

Shirou's relationship with Saber wasn't as deep as Archer's own. During his time as Shirou Emiya in his version of the Fifth Holy Grail War, Archer had gotten to call Saber 'Arturia', in which many historical books had mistakenly written her name as 'Arthur'. He'd even fell in love with her.

Sure, different names and different people, but the meaning was the same.

Kiritsugu shouldn't be replaced. Arturia shouldn't be replaced, too.

But when they eavesdropped Arthur conversing with their concerned mother about the war and their dead friends, telling his wife that he was going to help the Order from the Ministry side and that he was going to be okay, the twins couldn't help but to be worried.

After all, Arthur Weasly was still their father.

Author Notes: :)

I haven't thought much of the next chapter, since What a Coincidence (WaC) isn't really my priority. That goes to FoS (although I'm still stuck in the same chapter for over a month already). But if you have any suggestion, feel free to voice 'em out cuz your ideas may be interesting.