High school dxd: As Sukuna

Serafall's eyes sparkled. "See? I knew you'd appreciate it! And besides, it keeps you out of trouble. Well, mostly," she added with a wink.

Alastor's response wasn't what she expected. "Because of that, Sona was sad," he said, his tone flat.

Crack

A subtle crack echoed through the room, and Serafall's cheerful expression faltered.

"So-tan was sad?" Her voice dropped to a soft whisper, barely audible.

It was rare for Serafall to be anything other than exuberant, but her little sister's feelings had always been a sensitive subject for her.

Before she could dwell on it, Alastor cut in, offering a lifeline. "Don't worry, I handled it," he reassured her, a small, knowing smile playing on his lips. "But you owe me a big favor, Onee-chan."

Serafall's eyes twinkled again, "I'm already yours, Al-chan. So what's a favor between us?"

Alastor chuckled, raising an eyebrow at her. "You do know a magical girl shouldn't say something like that, right? It could be easily misinterpreted."

Serafall huffed playfully, her usual bubbly self returning in full force. "Why not? My little brother is super cool and strong! Any magical girl would be lucky to have you!" She leaned in, resting her head on his shoulder, her voice softening as she continued. "Besides, I'd do anything for you, Al-chan. You know that."

Alastor smiled,"I know, Onee-chan. I know." He paused, "But I need to what you and Sirzechs is planing for me and Rias."

Serafall's playful demeanor wavered for a split second, her eyes darting to the side as if searching for an escape. "Oh, look! So-tan is calling me! I should go see what she—"

Alastor crossed his arms, "Nobody's calling you, Onee-chan. Stop trying to change the subject. Tell me what you and Sirzechs are planning."

Serafall pouted, knowing she was caught. "Al-chan, you're no fun sometimes, you know that?" She sighed, her shoulders slumping slightly as she realized there was no easy way out of this. "Fine, fine. I'll tell you, but you have to promise not to get mad, okay?"

Alastor's gaze softened, but he didn't let up. "I'm listening."

Serafall fidgeted, twirling a strand of her hair around her finger. "Well... you know how much Sirzechs and I care about you, right? We just want what's best for you—and for Rias too, of course. So, we've been, um, nudging things along to make sure that you two spend more time together. You know, to see if something... sparks."

Alastor raised an eyebrow. "Sparks? You mean you're trying to play matchmaker?"

He figured that much as even before he left the underworld, Serafall was telling him to make Rias him.

He found that as just some joke but now, they even arranged a room next to Rias, he can tell they are cooking something.

Of course, Alastor didn't dislike any of that because he can live with a beautiful girl but he still don't like to played around, even if it's Serafall.

If it's anyone else he would cut his head clean for playing mind games with him but Serafall was not just anyone, so is Sirzechs.

If they did something, he knows that it's for his best.

"Not exactly! We just thought that if you and Rias got to know each other better, it might... help with some things. You know, like teamwork! And, um, maybe you'd both realize how great you are together?" Serafall said.

"So you are planing to marry us both," Alastor said.

Serafall know that Alastor is smart but she didn't think that he will quickly came to this conclusion.

As expected of my brother, Serafall thought.

Since he has already uncovered everything, Serafall didn't tried to hide anything.

"Yes," She said.

Alastor couldn't help but chuckle as he started find this all amusing like who wouldn't.

Serafall know, Sona is in love with him but here she was trying to make him marry Rias, Sona's best friend.

It's not just Sona, even Kuroka and Grayfia will be mad. Knowing all these Serafall still tried to ship Alastor to Rias.

"So, this whole situation with Rias—was that your idea?" Alastor asked, already knowing the answer.

Serafall grinned sheepishly. "Guilty."

"Tell me, Onee-chan, why are you and Sirzechs trying to make me marry Rias? You already know about Sona's feelings for me, and there's also Kuroka and Grayfia. What's your reasoning behind all this?" Alastor asked.

Serafall said."Don't worry about Kuroka-chan and Grayfia. They don't have any problem with you marrying Rias. They're... supportive, in their own ways."

Alastor raised an eyebrow. "Supportive?"

"Yes," Serafall confirmed. "But the reason why Sirzechs and I are pushing this marriage with Rias is because... you're a Lucifer, Al-chan."

Alastor frowned slightly, not seeing the connection. "And what does that have to do with anything?"

"It has everything to do with it." Serafall said with a smile.

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