Sona's eyes sparkled with anticipation as Shuo handed her the vial. She uncorked it, took a cautious sip, and instantly winced—pain lanced through her body, forcing her to her knees as red steam curled off her skin.
"Sona, hang in there! Just a few more seconds and the fusion will be complete!" Shuo urged, watching her closely.
As his words faded, the agony vanished from Sona's face, replaced by a look of wonder. Her aura shimmered, dragon energy radiating from her like heat off sunlit stone.
"How do you feel, Sona?" Shuo asked, concern and excitement mingling in his voice.
The Student Council girls rushed to her side, voices overlapping in worry.
"President, are you okay?"
"Sona, what happened?"
"President…"
Sona flexed her fingers, marveling at the strength thrumming through her veins. "I feel… incredible. I think I've hit Ultimate-Class Devil level."
Tsubaki and the others stared, awestruck. Sona could now sense the raw, untamed power of a dragon coiling inside her—an energy both exhilarating and intimidating.
"You haven't fully absorbed it yet," Shuo explained. "But with time, your power will keep growing."
Sona nodded, her usual composure cracking into genuine gratitude. "Thank you, Shuo-kun. Really."
He grinned, tousling her short hair. "Come on, Sona. With everything we've been through, you don't need to be so formal."
Even the ever-calm Sona blushed at his teasing.
"Alright, enough flirting," Shuo laughed. "Next up—Tsubaki. Let's go, one at a time."
One by one, each Student Council girl drank from the vial, bracing themselves for the transformation. Shuo stayed close, ready to intervene if anything went wrong. To his relief, every girl succeeded—their strength surging, their confidence reborn.
Soon, the group clamored for a sparring match, eager to test their new abilities. Shuo watched as they traded blows, the arena crackling with energy and laughter. He couldn't help but smile—until a soft, bubbly voice called out from across the field.
"Sona-chan!"
He turned, blinking in surprise. There, striding toward them, was a girl with a familiar face—slender, busty, her long black hair tied into twin tails that danced behind her. She wore a blindingly pink magical girl outfit, complete with a wand and sparkly accessories.
"S-Sister?!" Sona's composure shattered, her voice trembling.
Shuo recognized her instantly.
Serafall Leviathan—the Maou of the Underworld, Sona's older sister. Outgoing, flamboyant, master of ice magic, and hopelessly obsessed with magical girl cosplay. Her love for Sona bordered on the legendary; she was the very definition of a "sister complex."
Just as Serafall arrived, Shuo's system chimed in:
Ding! Sign-in character detected: Serafall. Tier: Black. Mission: Make her wear the system's [Deluxe Magical Girl Costume].
Oh, so that's why the system gave me that ridiculous outfit. It's been plotting this for ages.
On paper, the mission seemed easy—Serafall would never turn down a magical girl costume. But Shuo knew better. She was the ultimate sis-con; she'd once single-handedly demolished every suitor who dared approach Sona. If she found out Sona was living with him…
Yeah. He shivered. He'd need a flawless plan.
While Shuo pondered, Serafall reached the group, beaming and waving her wand.
"Yaho~! Hello, everyone!"
"Big sis…" Sona groaned.
"Serafall-sama, welcome!"
"Greetings, Serafall-sama."
The Student Council girls bowed respectfully.
Serafall sparkled, throwing up a double peace sign.
"Sona-chan, did you miss your big sister? When I heard you were in danger, I rushed right over!"
She pouted, voice dropping to a theatrical whisper.
"If I hadn't known my precious Sona-chan was safe, I'd have stormed Azazel's base myself!"
The girls stared, speechless.
Sona massaged her temples. "Sis, can you please stop saying stuff like that? You'll cause a panic. And didn't I tell you? Kokabiel was beaten by Shuo-kun. Why are you even here? You're a Maou!"
Serafall's gaze finally landed on Shuo, her eyes lighting up. She seized his hand with infectious enthusiasm.
"Oh! So you're Shuo Nangong—little Rias-chan's fiancé! Thank you so much for keeping Sona-chan safe."
She puffed out her chest, pride radiating.
"I'm Sona-chan's big sister—Serafall Leviathan, one of the four Maou of the Underworld! If you ever visit, just mention my name. No one will dare mess with you!"
Shuo blinked, momentarily stunned. Was he about to get the ultimate Underworld VIP pass? Not a bad deal.
He smiled diplomatically. "Sona and I are close friends. Protecting her is just what anyone would do."
Serafall winked, her tone playful. "Even so, I'm grateful you saved my little sister."
She turned to Sona, eyes wide and watery.
"And now, Sona-chan, you won't even hug your dear big sister? You're breaking my heart! Boo hoo!"
She pretended to sob, burying her face in her hands. Shuo watched, amazed at the speed of her emotional whiplash.
Tsubaki leaned over, whispering, "Don't mind her, Shuo-kun. Serafall-sama is always like this around Sona. You'll get used to it."
Shuo just nodded, lips twitching—he was at a loss for words.
Sona sighed, gently pressing her sister's head. "Sis, can you please act your age? I'm not a little girl anymore. You've pulled this trick a thousand times—I'm not falling for it again."
Shuo raised an eyebrow. Sona, you really know how to talk. Don't forget, you've got a little sister complex of your own.
He remembered her saying, "I absolutely won't let my sister be exposed to any pests."
One's a hardcore sis-con, the other's a closet bro-con. No wonder they're siblings.
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