Afterward, the room was quiet in that strange, fragile way that only comes when everything has already happened and there's nothing left to distract the mind.
Serafall slept soundly beside me, curled comfortably under the covers, her breathing slow and even. Whatever chaos she carried during the day was completely absent now. In sleep, she looked peaceful—almost disarmingly so. No theatrics. No booming laughter. Just Serafall, at rest.
And that was precisely when my thoughts decided to turn on me.
Post-clarity hit hard.
"Oh dear devil… What the hell did I just do?"
I stared up at the ceiling, hands folded behind my head, my heart beating far more calmly than the situation deserved. I had crossed a line. No—several lines. Political ones. Emotional ones. Personal ones.
I had gotten involved with my sister-in-law.
And not just any sister-in-law. A Devil King. One of the Four Maou: Serafall Leviathan.
Rias… Rias, I could at least imagine her reaction. Shock, jealousy—followed by a long, dangerous silence. I knew her well enough to brace myself.
But Sona?
That was the terrifying part.
Sona and I weren't as close. Not emotionally. Not yet. Our bond was built on duty, chessboards, and unspoken expectations. She wasn't impulsive like Rias. She was precise. Controlled. And if she felt betrayed…
"…She might actually kill me," I muttered.
What worried me most wasn't anger—it was disappointment.
"What should I do?" I whispered to no one in particular.
Strangely, I wasn't panicking. The calmness unsettled me more than fear would have. Maybe I was already past the point of rationality.
A soft movement beside me broke my thoughts.
Serafall stirred, stretched slightly, then opened one eye. When she noticed me staring at the ceiling like a condemned man, she smiled brightly.
"Good morning~" she said cheerfully, as if the universe hadn't just shifted on its axis.
I turned my head slowly. "You're… surprisingly relaxed."
She sat up, pulling the covers around herself without the slightest hint of embarrassment. "Of course I am. I slept wonderfully."
Then she leaned closer, peering at my face. "You look like you're having an existential crisis."
"…I might be."
She giggled. "How cute."
Before I could respond, she spoke again—far too casually.
"I've decided," she announced, "I approve of you marrying So-chan."
I froze.
"…What?"
She nodded seriously. "You pass. As a partner. As a man. As a future family."
My brain stalled. "That's… not the part I was worried about."
"Oh?" She tilted her head. "Then you'll love the condition."
My spine stiffened. "…Condition?"
She smiled sweetly.
"You need to convince So-chan to agree to a relationship involving the three of us."
Silence.
Absolute, soul-leaving-the-body silence.
My eyes widened. My mouth opened.
Serafall laughed and waved a hand in front of my face. "Careful. A fly might fly in if you keep your mouth open like that."
I snapped it shut immediately.
"…She will slap me," I said flatly. "Hard. Possibly with a book."
Serafall laughed harder. "Probably."
"That's not reassuring!"
She reclined back against the pillows, entirely too pleased. "I know my little sister. She looks strict and unyielding, but she's actually very shy. She just hides it behind rules and glasses."
"That doesn't make this better!"
"It does," Serafall insisted. "Because if this involved anyone else, she'd reject it instantly. But this?" She tapped my chest lightly. "It's you. And me. Family."
I buried my face in my hands. "She'll never agree."
"She'll argue," Serafall corrected. "She'll deny it. She'll turn red and pretend she doesn't understand."
She leaned closer, voice soft but confident. "But if you don't give up… if you're honest… if you persevere…"
I looked at her, exhausted. "…You're enjoying this far too much."
She grinned. "Maybe."
Then, gentler, she added, "I wouldn't push you toward something that would truly break her heart. I care about So-chan more than anything."
That gave me pause.
This wasn't a joke to her.
"…I'll think about it," I said finally.
Serafall smiled, satisfied, and leaned back against me. "Good. Take your time. if you persevere they you can enjoy both your little and older sister."
Hearing that, I nodded It is a wonderful thoughs. Ah fuck.
~~~
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