A tremor ran through Serafall's very being—a disturbance in the Force, as she would playfully call it, though it was, in fact, her deeply ingrained siscon superpower.

It was as potent as it was peculiar.

Despite being miles away in her family's Sitri territory, she sensed her beloved sister, Sona, sharing a clandestine kiss with Arthur in the Gremory domain.

The mere thought of it sent a wave of protectiveness mixed with a strange, possessive rage coursing through her.

"No one is going to lay a hand on my So-tan without me there to approve—or, more likely, to stop it!"

She declared to an empty room, her voice laced with a playful but firm threat.

When Serafall finally saw Sona at home, she noticed a change that was impossible to miss.

Her sister, usually so composed and even a little grumpy, was radiating an unusual happiness.

Her typical stern expression had softened, and a faint, shy blush seemed to have taken up permanent residence on her cheeks.

Serafall's heart both soared and plummeted.

She could tell that spring had arrived in her little sister's life, but she never imagined it would happen so quickly or without her direct supervision.

Rising from her chair, a determined glint in her eyes, Serafall prepared to leave.

"Where are you going at this hour, Sera?"

Lady Sitri asked, having lovingly prepared a special banquet for her daughter, who rarely came home.

"I'm going to check on So-tan. I'll be back in a flash, Mom,"

Serafall replied, a teleportation circle already forming at her feet.

Normally, teleporting into another devil's territory was impossible without express permission, a serious breach of protocol.

But Serafall's immense power as a Maou granted her a unique exception; she could go anywhere, and no one would dare to stop her—especially not when the safety of her precious little sister was in question.

Even Sirzechs, the Great Maou, would have a hard time getting in her way.

Lady Sitri sighed, a mixture of exasperation and hope on her face.

"Please, don't stop me from having grandkids, Sera,"

She murmured, a genuine plea in her voice.

She feared Serafall might inadvertently prevent Sona from pursuing a potential husband.

This was the first time Lady Sitri had ever seen Sona show an interest in a man, and she trusted her daughter's judgment completely.

Meanwhile, in Gremory territory, Arthur and Sona lay together on the bed, still holding each other after their poignant kiss.

Sona felt completely drained, both from the emotional intensity and the sheer embarrassment of it all.

She was too mortified to look at Arthur's face, her own heart pounding a frantic rhythm against her ribs.

Despite the outcome being what she had secretly wanted for so long, the reality of it was almost too much to bear.

She, a proper and strict young lady of the esteemed Sitri house who had rejected every suitor, now had a boyfriend.

"This feeling..."

Sona murmured, her voice barely a whisper, as she suddenly sat up, a jolt of recognition hitting her.

Just as Serafall had her potent sister-sensing superpower, Sona possessed a similarly finely tuned superpower for her big sister.

It was a sense of dread mixed with an undeniable, familiar presence.

"Your big sister is coming, isn't she?"

Arthur asked, a sense of deep foreboding washing over him. His body tensed, and he felt his life was in danger.

He was nowhere near strong enough to fight Serafall in a direct confrontation.

He estimated her power level to be around 12–13, a terrifying range somewhere between Grayfia and Sirzechs.

His own power was a modest level 7, a vast chasm separating them.

He had no chance of winning without a very careful and creative use of his sacred gears.

"Yes, she's coming. You need to be prepared,"

Sona said with a serious, almost resigned expression.

She remembered the last time someone had tried something funny with her; they had been frozen solid in a block of ice for a week.

Arthur didn't have to wait long. A brilliant blue teleportation circle of the Sitri house appeared before them, its intricate runes glowing ominously in the dim room.

Serafall emerged from it and, with the speed of a maelstrom, went straight to Sona.

"So-tan! I won't let him have you!"

She cried, enveloping her little sister in a tight, protective hug.

Sona, as usual, was helpless against her big sister's overwhelming affection.

Arthur, ever the strategist, used his skills to check Serafall's status.

[Parameter]

* Name: Serafall Leviathan

* Alias: Maou Sis-Con

* Level: 12

* Pow: SSS-1212

* End: SSS-1234

* Dex: SSS-1243

* AGI: SSS-1252

* MAG: SSS-1299

As he had expected, Serafall was a truly formidable force.

She was indeed stronger than Grayfia but still fell just short of Sirzechs's terrifying power.

"I'm sorry, Onee-sama,"

Sona said with newfound conviction, managing to wriggle free from the hug.

"But this is something I have decided for myself."

Serafall was completely shocked.

She had prepared for a tearful denial, for Sona to claim the man had forced himself on her, but instead, she was met with a bold and unwavering declaration of desire.

She looked at Arthur more seriously this time, scrutinizing him with her sharp, powerful eyes.

Despite his lower raw power level, the feeling of danger she felt from him was no joke.

'I feel like he could actually fight me... even though his raw power is only at a high-class level,'

Serafall thought, a frown creasing her brow.

She looked back at Sona, the playful protectiveness replaced by a deep, serious concern.

"Are you really sure about this, So-tan?"

She asked again, her voice low and serious.

Sona nodded, her gaze firm.

She was more than sure; she was certain this was what she wanted.

Serafall's expression hardened, a mischievous gleam returning to her eyes.

"Then you'll have to prove your worth,"

She announced, her voice rising with dramatic flair.

"If you can withstand half of my power, you will have my blessing and my little sister—and myself!"

"No!"

Sona instantly rejected the proposition, her voice sharp with panic.

She knew exactly what her life would be like if her big sister was going to have the same man as her.

She would have an overbearing siscon watching her every move for the rest of her life.

She loved her sister, but this was a boundary that could not be crossed.

...

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Little Spoiler: Digital World