He’d watched you long before he ever touched you.

From the moment you stepped into Itadori’s life — the infamous Gojo’s brat sister, all confidence and fire — Sukuna had wanted to claw his way through his cage and silence you. You were a menace. Smirking like the world belonged to you, cursed energy crackling around you like a storm barely leashed. Every word out of your mouth was a blade. Every look dared him to bite harder.

Worse? You were always there. With him. Laughing at Itadori’s dumb jokes, sparring until you both collapsed, brushing your fingers through his hair. Sweet. Warm. Constant.

And Sukuna — ancient, blood-soaked, brutal — was forced to watch from behind Yuji’s eyes. Helpless. Enduring every second.

Until the moments he broke through.

At first, it was quick — flickers of control, just enough to glare.

You’d always notice.

“Aw, the parasite’s awake,” you’d purr, cocking your head.

“Careful, girl,” he’d growl through Yuji’s mouth. “You’re one comment away from learning what your insides look like.”

You never flinched. Never showed fear.

“Big threats for someone with two minutes of screen time.”

Your sarcasm was poison. Your voice a snare. Every word drove him mad.

Then, Itadori made the worst mistake of all: falling for you.

And you let him.

You let him touch you. Kiss you. Curl his fingers around your waist like he deserved you. Sukuna had to feel every heartbeat, every breathless laugh, every sound you made in the dark.

He’d hijack Yuji’s body just to sneer at your affection. “If I hear him say ‘baby’ one more time, I’m cutting out his tongue.”

“Oh no,” you’d sigh, bored. “Then I’d miss his very talented mouth.”

Until one night, something cracked.

Midway through soft kisses, Yuji’s touch turned to claws. His grip tightened. His mouth became demanding, hungry.

You stilled.

But you didn’t pull away.

His lips found your throat, biting. His hand slid low, rough and certain. He felt you gasp, your breath catch. The way your spine arched when he sank his teeth into your neck. The way your voice shattered when he growled, “You taste like sin, girl.”

And your body — traitorous, beautiful — arched into him.

That was the first time.

Later, you claimed it was a mistake.

But it happened again.

And again.

Your moans came quicker under his mouth. Your nails dragged across his skin. And every time Yuji returned, dazed and clueless, Sukuna laughed.

“If his tongue touches you again, I’ll rip it out and feed it to him.”

And you’d hiss back, “He’s my boyfriend.”

Only for Sukuna to snarl, “No. You’re mine.”

You’d spit insults. Bite back. Tell him he meant nothing.

But you never told him to stop.

And he never did.

Until one day — Yuji was gone.

No trace. No heartbeat. Nothing.

You searched everywhere. Screamed at Gojo. Tore through cursed signatures like wildfire.

But deep down… you knew.

So when cursed energy thick as smoke swallowed your apartment that night, you didn’t ask who.

He was standing in your living room — tall, real, whole. Ryomen Sukuna. Not in Yuji’s face. Not behind someone else’s body. Just… him.

And he looked at you like he’d been starving.

You raised your weapon instantly, energy blazing like white fire. “Where. Is. My. Boyfriend?”

He tilted his head, voice smooth as poison. “Right here, little girl.”

You flinched. Then narrowed your eyes. “Tell me where Yuji is, or I swear to every god I’ll—”

“You’ll what?” he growled, stepping forward. “Cry for your little puppy? The one who could barely make you tremble unless I took over?”

You struck — your cursed blade to his throat. He didn’t flinch. Only smiled.

“Still so brave. You really are his sister.”

“You think this is funny?” Your voice broke — rage, pain, panic all churning together.

“No,” he said, softly this time. “I think it’s inevitable.”

Silence. Thick. Burning.

Then he said it.

“Come with me.”

You blinked.

“No more war. No more corpses. You want peace?” His voice dropped. Low. Serious. “Then admit it. What we both know. That you’re mine.”