"Oh my, brother-in-law-kun, where are your eyes looking?"
Serafall seemed to finally notice where Hiro's gaze had landed.
A teasing smile spread across her face as her flying body drifted a little closer to him.
"Is it that Rias-chan and Sona-chan alone can't satisfy brother-in-law-kun's desires, so you've started having thoughts about Magical Girl Leviathan-chan too? The energy of human boys is truly terrifying."
Hiro looked straight into Serafall's eyes and raised his eyebrows slightly.
He looked helpless.
"First, Rias and Sona are not in that kind of relationship with me. Second, can you stop calling me 'brother-in-law-kun'?"
Momo and Nana think he's their brother-in-law-well, probably.
Sephi thinks he's her son-in-law.
Sirzechs thinks he's his brother-in-law.
Serafall also thinks he's her brother-in-law.
And in a while, after Vali learns about Lavinia, he'll most likely see Hiro as his brother-in-law too.
He doesn't even have a nominal girlfriend.
So why do all of them unilaterally treat him like some kind of steamroller?
Is he, Nanamiya Hiro, really that kind of person?
"My relationship with Sona hasn't developed to that point yet, so it's too early to call me 'brother-in-law.' Besides, if Sona hears you call me that, she'll probably be very angry. She might not speak to you, her sister, for several days."
"Huh? Not speak to me for several days?"
Serafall froze.
The smile on her face stiffened almost instantly.
Her voice carried genuine panic-or perhaps carefully exaggerated panic.
"In that case, in that case, Leviathan-chan will die! Without Sona elements for replenishment, Leviathan-chan will truly, truly, truly die!"
You were in the human world while she was in the Underworld for so long, and you didn't die.
Hiro didn't say it out loud.
He just complained silently in his heart while watching the rapid change in Serafall's expression.
"All right, to avoid the loss of Sona elements, I can only call you Hiro-kun."
Serafall raised her hands and covered her face.
"My poor brother-in-law-kun is gone. Sob, sob, sob."
Given their flying speed, the Five-Tier Luck extraction was still in progress when they arrived at the Kirigaya residence and entered the castle.
After leading Serafall to the door of Sona's room, Hiro glanced at the excited magical girl beside him and gave a calm reminder.
"Let me say this first. It's fine for you sisters to bond, but if you cause too much noise and affect others' rest, don't blame me for intervening and forcibly calming you down."
Anyway, no matter how much the Sitri sisters messed around, the problem would definitely be with Serafall.
The siscon.
Not with Sona, the Kouh Academy student council president.
If something really went wrong, he only needed to use [Psychological Manipulation] on Serafall.
Everything would settle down.
"Yes! Yes!"
Serafall nodded vigorously, her small head bobbing nonstop.
Hiro raised his hand and knocked lightly on the door.
Knock. Knock.
With a devil's hearing, even if there was a noisy party going on inside, the sound wouldn't be ignored.
The facts proved his judgment correct.
Only a few seconds passed before the door creaked open.
Sona appeared in front of them, dressed in black silk pajamas.
"Hiro-kun."
She noticed him first.
A trace of surprise flashed across her face.
"It's so late. Why are you-"
Could it be that you finally chose me, between me and Rias?
The thought slipped through her mind before she could stop it.
Then she noticed the figure standing to Hiro's left.
Pink clothes.
Overflowing excitement in her eyes.
Sona's expression froze.
Shock appeared immediately.
Before Sona could react or ask anything, Serafall-still wearing her pink magical girl outfit-spread her arms wide and lunged forward.
Her voice was full of excitement.
"Sona-chan!"
Pounce.
Sona instinctively reached out and caught her older sister.
Ignoring the smooching sounds echoing beside her ears and the fact that her glasses were slightly crooked, Sona asked in alarm.
"S-Sister! The peace treaty was just signed not long ago. As Leviathan, shouldn't you be staying in the Underworld to handle official business? Why are you here!"
Although the question was directed at Serafall, Sona's gaze never left Hiro.
It stayed firmly fixed on him.
Faced with Sona's questioning look, Hiro spread his hands.
He indicated that he didn't know either.
That explanation didn't satisfy her.
Not even a little.
Serafall showed no intention of answering.
Left with no choice, Sona temporarily released her sister and looked back at Hiro.
Her tone was helpless.
"Hiro-kun, you know my sister's identity. You also know the current situation in the Underworld. Why did you let her come here? You should understand the potential political instability that could happen when my sister is absent, right?"
"I am not a devil."
Hiro shrugged calmly.
"What does the situation in the Underworld have to do with me, a mere human?"
"..."
Hearing that, Sona fell silent.
She finally remembered that, given Hiro's identity, he really didn't need to care about the Underworld's situation.
The devils he was acquainted with were all in the human world.
They wouldn't be affected by the Devil race's internal issues.
While Sona was still processing that realization, Serafall's Five-Tier Luck reached its extraction time.
"Ding!"
"Five-Tier Luck extraction complete. Congratulations to the host for obtaining the reward: Progenitor Bloodline."
"Progenitor Bloodline: When used, it grants the user extremely powerful immortality. The head and heart are no longer vital points. Even if cut into pieces or burned to ashes, the body can gradually recover."
Progenitor.
Which Progenitor?
Type-Moon?
Strike the Blood?
Or something else entirely?
Hiro listened to the system's prompt echoing in his mind.
He turned, intending to head back to his room.
Then the system continued.
"Ding! The system has detected that the host possesses a reward of the same type: Vampire Bloodline."
"The host may choose to fuse the two."
"After fusion, the bloodline's inherent effects will be further enhanced."
"The user will additionally receive one Servant of random strength."
The system fell silent.
Hiro stopped walking.
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