DxD: Scion of Lucifuge

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"Onii-chan is so kind!" Mio said, her face flushed as she watched Roy leave the room.

"Hmm... something feels off," Maria mused, stroking her chin thoughtfully.

She felt that something was strange about Roy, but she could also sense that her Charm spell was working on him.

"Maria, there's nothing wrong with Onii-chan. Now, go get some rest," Mio said, crossing her arms with a slight pout.

"Alright, Mio-sama. Good night."

Maria reluctantly left the room. But she wasn't going to sleep just yet. She had to protect Mio.

Ever since she was assigned to watch over Mio, she had been working hard every night, eliminating the Stray Demons attracted to Mio's power.

So, after leaving Mio's room, Maria went outside to patrol the area, as usual.

However, hours passed, and she didn't encounter a single Stray Demon. She was starting to feel sleepy.

"That's strange. Why aren't there any Stray Demons tonight?" she wondered.

She carefully examined the surroundings but couldn't find anything unusual.

Finally, she gave up and went back to sleep.

...

The next morning, Roy was sleeping soundly when he heard the door open.

He peeked through his eyelashes and saw Mio entering the room.

'What is she doing?' he wondered.

He decided to pretend to be asleep and observe her.

"Onii-chan looks cute when he's sleeping," Mio giggled, approaching the bed and looking at Roy with amusement.

"According to the knowledge Maria gave me, this is how you wake someone up—" she muttered to herself, then climbed onto the bed and sat on Roy's lap.

Dressed only in shorts and a tank top, she seemed oblivious to how suggestive her actions were.

"Onii-chan, wake up..." she whispered, leaning down and resting her head on his chest.

Roy decided to play along and opened his eyes.

"Ugh... Mio?" he mumbled, rubbing his eyes and forcing a sleepy smile.

"Yes, I'm here to wake you up, Onii-chan," Mio replied with a bright smile.

"Okay." Roy nodded and wrapped his arms around her waist.

Mio froze, her body stiffening.

"Onii-chan..." she stammered, her voice trembling with embarrassment.

"Mio, aren't you forgetting something? The good morning kiss?" Roy asked, feigning confusion.

"G-Good morning kiss?" Mio's face flushed crimson.

"Yes, we always do that, don't we?"

Mio, seeing his confused expression, instantly understood. She assumed that Roy's memories were influenced by the Charm spell.

That's why he remembered their "past" together.

And in those memories, he always received a good morning kiss from his little sister when she woke him up.

Mio's face turned even redder.

But she realized that if she didn't play along, the Charm spell might wear off.

So, she did it.

She gave him her first kiss.

...

After a while, they finally left the room.

"Onii-chan, breakfast is almost ready!" Maria called out from the kitchen.

"Good work, Maria," Roy said, entering the kitchen after washing up.

"Heh, it's nothing. But my cooking isn't as good as yours, Onii-chan," Maria replied, a bit embarrassed.

Her cooking was nowhere near as good as Roy's.

"Don't worry, let me see."

Roy examined the dishes Maria had prepared, then added some seasonings.

"Wow, it smells so good now! How did you do that?" Maria asked in surprise.

"It's all about the seasoning. I can teach you if you want," Roy offered with a smile.

"Really? That would be great!" Maria exclaimed, thrilled.

...

They soon enjoyed a delicious breakfast.

Mio and Maria ate with gusto, not caring about their table manners.

After breakfast...

"Mio, Maria, it's time for school," Roy announced.

"School..." Mio and Maria exchanged hesitant glances.

They hadn't been to school in days due to the constant attacks from Stray Demons.

And they didn't want to bring those Demons to school.

"Yes, of course, you have to go to school. It's Monday, remember?" Roy insisted.

Mio and Maria reluctantly agreed and got ready.

...

"Onii-chan, what class are you in?" Mio asked as they walked to school.

They were surprised to find that Roy attended the same school as them.

"I'm in the same class as you, Mio. Don't you remember?" Roy replied casually.

"R-Really?" Mio was confused.

She didn't remember having a classmate named Roy.

Perhaps he had transferred during her absence?

She couldn't think of any other explanation....

....

Roy had just arrived in this world. Of course, he wasn't in the same class as Mio. He had simply made it up.

But with a simple spell to alter perceptions, he could make everyone in the school believe he was a student.

Even the powerful beings in the school wouldn't notice anything amiss.

...

At school—several girls greeted Roy enthusiastically.

"Huh? When did Onii-chan become so popular at school?" Mio wondered, feeling a bit annoyed by the attention he was receiving.

"Onii-chan is handsome. It's normal for him to attract girls," Maria replied matter-of-factly.

"I guess so." Mio agreed.

Roy simply smiled without saying anything.

Maria wasn't attending this school, as she was only here to protect Mio.

So, only Roy and Mio entered the school.

The classroom fell silent as they entered.

Then, it erupted in whispers.

"Mio-san and Roy-san came to school together!"

"Mio-san was on leave, wasn't she? I wonder what their relationship is."

"Damn it! Is Mio-san going to steal Roy-san away from us? I'm not giving up!"

"This new guy is infuriating! He's already close to two of the school's most beautiful girls!"

...

Mio blushed, hearing their comments.

The desks were separate, so Roy and Mio weren't sitting together.

Instead, Roy was sitting next to a blue-haired girl.

Roy recognized her as Yuki Nonaka, a member of the Hero Clan and one of the main heroines.

The power structure in this world was similar to that of High School DxD.

There were Demons, Gods, as well as Heroes.

The three factions maintained a delicate balance of power.

Yuki was here to monitor Mio—the heir to the Demon Lord.

And since the Hero Clan was monitoring Mio, the Demon and Gods factions must have sent their own representatives as well.

There was also Chisato Hasegawa, a mature woman with long black hair and glasses. Her true identity was Afureia—former high-ranking god amongst the Ten Gods of the Divine Realm

However, most of her powers were sealed, leaving her with only defensive and support abilities.

Her true strength was probably comparable to a Maou-class.

Roy was interested in her, but she wouldn't be easy to win over.

Chisato Hasegawa was a close friend of Jin Toujou and a former goddess, while also being the cousin of Basara Toujou's mother.

That's why she had readily given herself to Basara in the anime.

But Roy didn't have such a connection with her.

However, that wouldn't stop him.

...

Roy found the class boring and decided to take a nap. The teacher didn't seem to mind.

Thanks to his altered perception spell, which was based on Kuoh Academy, he had top grades, so the teachers didn't bother him.

"Roy-san! Roy-san, wake up!"

Roy was suddenly nudged awake.

He blinked and saw Yuki Nonaka looking at him.

"What is it, Nonaka-san?" he asked.

"I need to talk to you. Come with me," Yuki said, taking his hand and pulling him out of the classroom.

The other students were shocked.

Yuki Nonaka was holding a boy's hand in public.

This was big news.

Mio, seeing her "brother" being dragged away, was furious and chased after them.

...

They reached the staircase leading to the rooftop.

Roy was pulled along by Yuki, with Mio following close behind.

"Yuki Nonaka, where are you taking my brother?" Mio demanded, blocking their path.

"Your brother?" Yuki's eyes narrowed.

She didn't remember Mio having a brother.

She realized that Roy must be under the influence of a Charm spell. That's why he came to school with Mio today.

"He's not your brother, is he? Step aside, or else..." Yuki threatened.

Mio flinched, afraid that Yuki would tell Roy the truth and break the spell. She didn't want to lose her "Brother."

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