After Stealing Hero's Mother, I Reincarnated in the Fantasy World!

That time when they made the bet, it hadn't even been a couple hours since Rain had arrived in this new world. So Rain didn't think much about it, making the bet in words only, without signing anything.

As for the current situation...

Rain looked at his sister Eliana, who stood defiantly in front of him with her arms crossed over her firm chest.

No part of her was willing to accept this reality. She couldn't back down here. It would be to jeopardize the worldview she had held since childhood.

Now she was driven forward by an absolute certainty of her rightness, which had grown even stronger during the last hours of reflection.

…He hoped it wouldn't come to that.

Not a fair fight with Gray? Underhanded tricks?

Her pride was even greater than he'd expected, as was her unwillingness to accept reality.

But...

'Does that mean it will be even sweeter for me to subdue her?'

'To see the look on her face after total, unequivocal defeat? The very moment she realizes the brutal reality...'

For a second, Rain couldn't contain his dark desires, letting his predatory smile come out, exposing his teeth.

'Dueling... it's pretty funny.'

A paper appeared in his hands. It was [Soul Contract].

"Huh? What is it?"

Her momentum was thwarted when she saw a paper appear out of nowhere in front of Rain.

"Eliana. You're like a little child, whining about everything, unwilling to admit defeat and move on with your life. Things are so bad that I wonder if you're really my sister. You could learn a thing or two from Liana."

Rain ignored her angry look and continued.

"And while it's clearly your problem… I'll give you a chance."

He showed her the paper in his hands.

It was a silver-tinted paper, with glossy patterns around the edges that shimmered mystically with different colors.

"This is what will be our 'guarantee' in the coming duel."

He wasn't going to make the same mistake twice.

"Did you have such a thing...?"

Eliana looked at him in bewilderment before her earlier attitude returned.

"Great! Let's do it as soon as possible!"

"No. Pay your half for it first. After all, it's my personal item that will be used to seal our deal."

"...Okay."

She reluctantly but still confidently opened her storage ring, asking.

"How much?"

Rain gave her an amount in High Grade Magic Crystals that he deemed acceptable.

Magic Crystals helped with cultivation, so they were the universal currency in this world where strength was valued above all else.

Eliana didn't hesitate to take out the amount and handed it to him.

"That's it?"

"Yes."

Putting the full amount into his storage ring, Rain smiled sweetly.

"Now we can get down to our business."

Rain quickly wrote down the general rules of their bet on Soul Contract, checking them a couple times and handing the paper to his sister.

The rules were the same as in their original bet, the one they'd made at the beginning. If Eliana won, Rain would give her the Elixir of Evolution, and if Rain won, she guaranteed that she would fulfill one of his wishes.

Eliana looked over the contract and added a few new rules to prevent him from 'cheating' during their duel. She nodded satisfied afterward, meeting his gaze defiantly.

"Dear brother, are you sure? Once we do this, there will be no turning back. Aren't you afraid that your tricks will be exposed?"

She asked in a teasing tone, hoping to get something out of him.

But Rain only smiled silently, holding out his hand.

Without blinking an eye, they both dripped a drop of blood on the paper.

Soul Contract sparkled with the reflected light of their souls, wrapping an invisible grip around them, binding their bet securely.

Their contract was officially finalized.

A smile spread across the lips of both siblings, signaling their confidence in their victory.

"Follow me."

Rain walked lightly out of the room, waving his hand to Eliana.

After a moment's hesitation, she followed him.

Rain walked through the manor, humming happily to himself.

He had slept well, was well fed, and his eyes were full of desire.

All that remained was to complete what had been started.

Soon they reached the right destination.

It was a familiar, memorable place.

It was their family's private training room, where Rain had first met his sisters after arriving in this world, catching them practicing together.

It was also a happy place. Although it was a workout room, there was a great aura for sex here.

Knowing that the battlefield was already on his side, his smile grew even wider.

His first 'battle' with his Master Astrid also took place right here.

And today he was determined to surpass his past exploits.

'I don't know about duels, but it brings a certain nostalgia.'

While Rain was reminiscing about the time he'd spent, Eliana had already walked around the room and stood across from him.

Rain didn't wait any longer either, pulling out his blade.

Eliana, however, was in no hurry to start. She narrowed her eyes and stared at him for a while before she spoke.

"Take off your clothes. I want to make sure you don't use anything forbidden like you did in the fight with Gray."

It seemed that even a signed contract couldn't assuage her suspicions.

Or were they glimpses of her realization that everything she believed in was just an illusion?

Regardless...

"Of course. But then you'll have to do the same. Pretty fair, isn't it?"
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"Unlike you I never...!"

Even to Gray she hadn't shown that part of herself yet, but her own brother had asked for it!

"Then forget it, I won't do it. There was no such clause in our contract anyway."

Without further ado, Rain stood up in a stance, showing that he was ready to begin.

Casting a glance at his nonchalant demeanor, she replied.

"Okay..."

She went next door, clenching her fists and whispering.

"It's for Gray..."

"I hope there's a minimum of clothes left!"

Rain shouted after her as he pulled off his shirt and pants, stopping only when he was down to his underwear.

A minute later, Eliana returned in a light tank top and short shorts, revealing a great deal of bare skin.

Needless to say, all of this was accompanied by a very angry expression on her face.

Her eyes quickly ran over his fit body, but she quickly focused again.

"Oh, you are contentedly sincere in your intentions, sister."

Rain immediately assessed her appearance and made a cold conclusion.

'Fighting just got a little harder.'

"If you tell anyone about this..."

Eliana didn't finish the threat, giving him a murderous look.

'System, record that image. I want to remember a time when she could still look at me like that. We'll laugh about it with her in the future.'

"Why would I tell anyone about this? I plan to see a lot more of it."

He ran his gaze over her smooth bare skin once more, seeming to memorize every detail.

"I wanted to finish when I won… but now I won't stop until I beat you to a pulp."

With these terrifying words, the tension between brother and sister reached its peak.