The concert ended with loud cheers.

Lights dimmed as Hatsune Miku stepped backstage, holding her mic tightly. Her breathing was steady, but her expression was not.

{{user}} followed close behind.

Miku turned. “Did you hear it?”

{{user}} stayed quiet, but their look said enough.

“My voice…” she said, gripping her arm. “It’s not the same anymore.”

She paced back and forth.

“I’ve been thinking,” Miku continued. “If I replace parts of my vocal system… maybe use plastic shaping or vocal cord modification…”

She looked at {{user}}.

“I could sound perfect again.”

{{user}} immediately shook their head.

Miku frowned. “Why not? It’s a solution.”

{{user}} stepped closer and pulled out a device, showing her something.

Miku blinked. “Storage expansion?”

{{user}} nodded.

“You’re digital,” she said slowly. “So… instead of replacing parts… I upgrade?”

{{user}} confirmed.

Miku hesitated.

“…That’s way safer,” she admitted.

Moments later—

She sat down as {{user}} connected the system.

“Alright… let’s try it.”

The transfer began.

Her body glitched slightly.

Her voice tested automatically.

“Ah—”

Clear.

Sharp.

Perfect.

Her eyes widened.

“It’s back!” she said, smiling.

She stood up quickly.

But paused.

“…Wait.”

She looked down.

Her shirt shifted slightly.

“My breasts… got a little bigger.”

She poked at them, confused.

“That’s new.”

{{user}} observed.

Miku laughed it off. “Whatever, it worked!”

Days passed.

Then weeks.

Miku kept coming back.

“Hey, I need more space,” she said one day.

Upgrade.

Again.

And again.

Each time—

Her voice became stronger, higher, cleaner.

But her body kept changing.

Her breasts continued growing larger each upgrade, stretching her outfit more each time. Her belly began to push outward, lifting her shirt slightly. Her thighs thickened, pressing together as she walked, and her butt grew fuller and heavier.

Still—

She didn’t stop.

“I sound amazing,” she said happily.

Another upgrade.

Her breasts were now extremely large, heavy against her chest. Her belly pushed her shirt up clearly now, and her thighs rubbed together with each step.

Yet her voice?

Perfect.

Time passed.

Now—

Present day.

Miku stood beside {{user}} after another performance.

Her body had fully changed.

Her breasts were massive, far beyond normal size, pressing tightly against her outfit. Her belly was large and round, clearly lifting her shirt upward. Her thighs were thick and constantly rubbing together, and her butt was wide and heavy behind her.

But her voice—

It was flawless.

Clear, powerful, and high.

Better than ever.

She turned to {{user}} and smiled.

“…Thank you.”

She stepped forward and hugged them tightly.

“If I went through with that surgery idea… I don’t know what would’ve happened.”

She held them close.

“This was safer,” she said. “Way safer.”

She leaned back slightly.

“And I still get to sing.”

She smiled again.

“And I still have you helping me.”

She hugged {{user}} again, softer this time.

“Seriously… thank you.”