Obey me x Demon slayer

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**Scene — The Seventh Sin Breaks

The Attic of the House of Lamentation**

You climb the stairs slowly—too slowly—each step creaking like a warning. The entire House still feels cold since the brothers turned their backs on you… but up here?

Up here feels dangerous.

The attic door is cracked open, a thin strip of darkness inside. You swallow hard and push it fully.

Belphie stands in the center of the room.

Not lounging in his chair. Not curled in his blankets. Standing.

Still.

Face blank.

But his aura? His aura coils violently around him like a living shadow.

He doesn’t look up when you whisper:

“Belphie… we need to talk.”

“Oh?” His voice is soft—too soft. “Now you want to talk.”

You take a step in.

“That’s not fair. I didn’t hide my past to hurt you—”

The door slams shut behind you, sealing you inside.

Belphie finally lifts his head.

And his smile is wrong.

So wrong.

“Fair?” he echoes. “You’re going to lecture me about what’s fair?”

Your breath catches.

“Belphie—”

He takes one slow step forward.

“You killed demons.”

Another step.

“You killed things like me.”

Another.

“You killed my kind… and then you walked into my home like nothing happened.”

You stumble back but he keeps coming, shadows sliding across the floor like water following his feet.

“You want to know what’s funny?” Belphie whispers. “I trusted you.”

Your heart twists. “Belphie, I never—”

“Do you know what betrayal feels like?”

His voice is still soft.

But something inside it cracks.

“You should,” he continues, “since you’ve inflicted it before.”

His wings unfurl—massive, dark, shaking with emotion he can’t contain. The air grows denser, colder, pulling at your lungs.

You try again. “I didn’t kill innocent demons. I never hunted anyone who didn’t hurt humans—”

Belphie’s expression hardens.

“So what you’re saying is… if you’d met me back then—”

He lifts his hand.

The shadows rise with it.

“—I wouldn’t have survived you.”

The accusation cuts deeper than any blade.

“No,” you choke. “I swear I would never hurt you.”

Belphie’s smile fractures into something feral.

“Funny. Because right now…”

Shadows cling to your ankles, cold and heavy.

“…I’m not so sure I believe you.”

Your pulse spikes.

“Belphie—stop—”

He tilts his head, studying your fear, drinking it in like it’s something he’s wanted to see.

Like it’s something he needs to see.

“Do you know what I keep thinking?” he murmurs. “Why should I trust a demon slayer? Why should any of us?”

The shadows tighten around you. A chill sinks into your bones.

“Why should I let someone stay in this house when they have a history of killing people like me?”

You shake your head violently. “Because I chose you. I chose all of you. I left that life behind— I walked away from it—”

“Did you?” Belphie whispers. “Or are you just waiting for the right moment to walk away from us?”

The words feel like a knife.

“I would NEVER leave you!”

Something flickers in his eyes—pain, raw and bitter—but it hardens instantly.

“Too late,” he breathes. “I’ve already decided.”

He holds up two fingers.

Your heart stops.

His shadows surge like a wave.

Then—

“BELPHIE. ENOUGH.”

The door bursts open.

Lucifer stands there, fury shaking the entire attic. Behind him, Mammon’s pale, panicked face peeks through.

Belphie’s shadows recoil like they were burned.

Lucifer’s voice is a whip. “I said we needed time. I did not say you could hurt them.”

Belphie’s eyes flash.

“I wasn’t going to kill them.”

“You were going to do worse,” Lucifer snaps.

The air hums with tension, dangerous and sharp.

Belphie steps back, chest rising and falling too fast, anger and betrayal twisting in his expression.

He points at you, voice breaking:

“THEN KEEP THEM AWAY FROM ME!”

The shadows explode outward and then vanish in a blink. Belphegor disappears into the darkness of the attic’s back door, slamming it hard enough to splinter wood.

Silence falls.

Cold. Shattered. Heavy.

Mammon rushes to your side, grabbing your shoulders.

“Are ya okay?! MC—talk to us!”

You nod weakly, though your legs tremble.

Lucifer’s eyes soften—only slightly—but it’s enough to show he’s shaken too.

“He crossed a line,” Lucifer murmurs. “But so did you, by keeping this from us.”

He pauses.

“But… this is only the beginning.”

The attic feels emptier.

And Belphie’s last words echo in your mind:

Keep them away from me.

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