DxD: Scion of Lucifuge

"Friendship is not determined by how much time you spent together!!"

— Bon Clay, One Piece

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[High School DxD World, Rias Mansion]

"We're finally back!"

"This trip was quite fruitful!"

"Yes, everyone caught amazing Familiars!"

"Roy-sama is really incredible!"

...

The girls chattered excitedly as they returned to the mansion.

They released their Pokémon, filling the mansion with even more energy and activity.

After a while, they went to rest. After all, they had been camping outdoors for the past few days, and nothing beat the comfort of home.

Roy and Rias were the only ones left in the spacious living room.

"Rias, you must have many questions," Roy said softly, sipping the tea Akeno had prepared.

Their trip to the Pokémon world had revealed many unbelievable things.

But Roy knew the girls wouldn't pry if he didn't offer an explanation. That was one of the things he appreciated about them.

"Yes, I do have many questions," Rias admitted, setting down her teacup and sitting beside Roy.

She wrapped her arms around his neck, her bright eyes gazing into his.

"If you want to tell me, I'll listen."

Seeing her understanding and supportive demeanor, Roy couldn't resist any longer. He leaned in and kissed her.

"Mm!" Rias was momentarily surprised but quickly responded to his kiss.

Suddenly, a burst of flames erupted in the room.

A fiery magic circle appeared, emblazoned with a flame-like crest.

Rias seemed to sense who was arriving. She gently pushed Roy away.

Roy also knew who it was: Riser Phenex.

But he didn't care. He was focused on Rias.

The magic circle flared, bathing the room in a crimson light.

Flames surged from the circle, and a wave of heat washed over them.

A figure emerged from the magic circle.

"Yo, Rias, I've come to get you!" the figure announced, then froze, his eyes widening at the sight of Roy and Rias locked in an embrace.

His face instantly darkened, and his aura flared with rage.

Roy finally released Rias, having savored her kiss.

Rias, her face flushed, caught her breath and turned to the newcomer.

"Riser Phenex, this is the Gremory territory," she warned.

The newcomer, dressed in a red suit with his jacket casually unbuttoned, was indeed Riser Phenex.

"Rias, You're a High-Class Devil. How can you associate with this trash?" he scoffed, seemingly unfazed by what he had just witnessed.

"It's none of your business who I associate with! And Roy is not trash!" Rias retorted coldly.

"Rias, don't forget, I'm your fiancé. I've come to take you back to the Underworld with me," Riser declared, approaching her with a smug grin. He reached out to caress her cheek, completely ignoring Roy.

"Calling me trash? I can't let that slide," Roy said, his voice low and dangerous.

The room, previously filled with the heat from Riser's flames, suddenly turned icy cold.

Roy vanished from his spot and reappeared before Riser, punching him squarely in the face.

Bam!

Riser, caught off guard, was sent flying, crashing through several walls before being buried under the rubble.

Roy hadn't held back.

"How dare you lay a hand on my woman!" Roy snarled, returning to Rias and pulling her close.

His possessiveness stunned Rias.

She looked at Roy with adoration, her eyes filled with warmth.

"What's going on?"

"What happened?"

"Roy-onii-chan, are you okay?"

...

The commotion drew the other girls to the room.

"It's nothing. Just an unwelcome guest," Roy said dismissively.

Boom!

The rubble where Riser had landed exploded outwards.

Riser emerged, engulfed in flames.

"You lowly Devil..." he roared, his face contorted with rage. "I'll incinerate you right here!"

As the third son of the Phenex family, he had never been so humiliated.

With a wave of his hand, a crimson magic circle appeared, and over a dozen beautiful girls of various appearances materialized behind him.

These were Riser's servants.

Riser, with his harem of beautiful Devils, was the envy of many male Devils in the Underworld.

"Riser Phenex, I won't let you do as you please!" Rias declared, stepping in front of Roy.

"Hmph! If you want to hurt Roy, you'll have to go through us first!" Saya retorted, taking out a Poké Ball.

"Koi, come out!"

"Roar!"

A beam of light shot out from the Poké Ball, and the massive Gyarados appeared.

Its intimidating aura terrified Riser's Low-Class Devil servants.

Even Yubelluna, Riser's Queen and an High-Class Devil, looked apprehensive.

Only Riser remained unfazed by Gyarados.

"Hmph! It's just a beast," he scoffed.

Indeed, although Gyarados was powerful intermediate High-Class with Ultimate-Class Potential, it couldn't harm the immortal Riser.

Just as the tension reached its peak, a silver magic circle appeared between the two groups.

A woman with beautiful silver hair and dressed in a maid outfit emerged. It was Grayfia, Roy's elder sister.

Grayfia's arrival brought with it an overwhelming aura that pressed down on Riser and his peerage.

Riser's Low-Class Devil servants, already terrified by Gyarados, collapsed to the ground.

Even Riser and Yubelluna were intimidated by her power and couldn't help but lower their heads.

Roy silently praised his sister. She was truly a protective older sibling.

Without even asking for an explanation, she had asserted her dominance, making Roy feel a bit sorry for Riser.

He had already been punched by Roy and now had to endure the oppressive aura of a Maou-class Devil. Riser felt utterly humiliated.

"Riser Phenex," Grayfia said calmly, "the Phenex and Gremory families have decided that Rias engagement will be determined by a Rating Game between you and Roy."

"Therefore, until then, please refrain from any unnecessary actions."

"The Silver-Haired Annihilation Queen! Damn it!" Riser cursed under his breath, recognizing Grayfia.

He didn't act rashly anymore.

After all, this was the woman who had challenged Serafall Leviathan, for the title of the strongest female Devil.

"You challenge me to a Rating Game? Hmph! Just you wait. I'll crush you!" Riser threatened before teleporting away with his peerage.

Although cocky, Riser was a formidable fighter, ranked among the top ten newcomers in Rating Games.

He had only lost once, and that was intentional, to maintain good relations with his opponent.

Roy, on the other hand, was known as a failure in the Underworld and had never participated in a Rating Game.

Whether he even had a peerage was unknown.

That's why Riser had underestimated him.

After Riser left, Grayfia turned to Roy. "Come with me."

"Yes, Sister" Roy replied, instructing the girls to rest, then followed his sister.

Once they were gone, the girls erupted in chatter.

"Ara ara, so that's the Silver-Haired Annihilation Queen!"

"Roy-kun's sister is so cool!"

"She's amazing!"

"I wonder what she wants to talk to Roy about."

...

Meanwhile, Roy followed Grayfia to a private room.

His sister was elegant and beautiful, though her maid outfit seemed a bit out of place.

He wasn't sure when she had developed a fondness for maid outfits.

Of course, Roy didn't mind.

"Roy, you don't have a Queen in your peerage yet, do you?" Grayfia asked.

"Uh, no" Roy admitted, surprised by her question.

He hadn't introduced the girls' ranks when he brought them to the Underworld last time.

"Then let me be your Queen," Grayfia declared calmly.

"What?" Roy's eyes widened in disbelief.

He had considered asking Grayfia to be his Queen, but it was just a fleeting thought.

He wouldn't actually ask her..

He didn't expected her to offer herself.

"Of course, Sis!" Roy exclaimed excitedly.

He took out the Queen piece and handed it to her.

He had long envied Riser Phenex.

Not only did Riser have a peerage full of beautiful girls, but he had even made his own sister his servant, adding a "little sister" attribute to his team.

It was a feat that many Devils envied.

But Roy was no different now. He was about to make his own sister his Queen. The thought thrilled him.

Grayfia was surprised by Roy's immediate acceptance.

She found his excitement both amusing and endearing.

She took the Queen piece and merged it with her body.

A powerful aura erupted, enveloping the entire mansion.

The girls and their Pokémon were stunned into stillness.

And this was just Grayfia's unintentional release of power.

Then, another powerful aura emerged, rivaling Grayfia's.

This was Roy's aura.

Having made Grayfia his Queen, he received a tremendous power boost.

His strength surged from the mid-level of High-Class > Ultimate-Class > Maou-Class!!

...

After a long moment, they both retracted their auras.

Grayfia was the first to recover. She immediately noticed the change in her power.

Her strength had increased significantly, almost reaching the peak of a Maou-class Devil.

If she could break through, she would become a Super Devil.

Super Devils were at least a level above Maou-Class Devils.

An ordinary Queen piece wouldn't have boosted her power this much.

Grayfia looked at her brother curiously, but she couldn't see through his strength anymore.

Her curiosity about her little brother grew.

"What's going on?" she finally asked.

"Sister, the Evil Pieces I gave you are mutated pieces I obtained by chance. Every time I gain a servant, my strength increases. Now, I also have the power of a Maou-Class Devil," Roy explained with a smile.

He attributed the system-granted Evil Pieces to chance, making it seem less unusual.

He wasn't ready to reveal the system's existence yet.

Even so, Grayfia was astonished.

She had never heard of such powerful and unique Evil Pieces.

And she was touched by Roy's trust in her.

"Sister, although you're now my Queen, I won't let you participate in the Rating Game against Riser Phenex," Roy declared.

"After all, it would be unfair to him if you fought."

Roy knew why Grayfia had offered to become his Queen.

She was worried he would lose against Riser.

Now that his strength surpassed Riser's, there was no need for Grayfia to participate.

Even with his previous High-Class Devil strength, Roy was confident in his victory.

"Very well," Grayfia agreed.

Now that Roy was a Maou-class Devil, she had no reason to worry.

No matter how powerful Riser's immortality was, he was still just an High-Class Devil. He couldn't defeat a Maou.

Roy and Grayfia returned to the living room.

The damaged walls had been repaired, a testament to the convenience of magic.

Roy addressed the girls with a smile. "I have an announcement to make."

The girls looked at him expectantly.

"Sister has become my Queen!"

The girls were stunned.

They hadn't expected the aloof and serious Grayfia to become Roy's Queen.

"That's great! Now we'll definitely win the Rating Game against Riser," Asia exclaimed, relieved.

She had been worried about the upcoming match.

"Yes! Grayfia-sama is as strong as a Maou! She can easily defeat that Riser chicken!" Alice chimed in.

"No, Sister won't be participating in the Rating Game," Roy corrected them.

"After all, It would be bullying to have her fight Riser."

"And even without Sister, I'm confident we can win."

"Yes, we've been training hard for this. We've all become much stronger," Saeko added with a smile.

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