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hello hello, i got an idea about tsunoda!yn who is an idol (hoshino ai typa idol, so she's very famous in japan). so she's yuki's younger sis and when the drivers have a race in japan yuki insisted on going to japan early because he wanted to watch a concert that he can't stop talking about, so the others decided that they will also go for fun but yuki doesn't tell them that it was his sis concert. i think the song 'idol' from the anime oshi no ko would fit perfectly because as stated before she's basically based on hoshino ai, besides in the anime the fans REALLY loved that song so they go crazy with fanchants and stuff.

thank you!!!

🌸 Starlight Siblings: When F1 Accidentally Discovers Yuki’s Idol Sister

Pairing: Platonic F1 Grid x Tsunoda!AiHoshino!Reader Genre: Chaos, comedy, fluff, sibling dynamics Warnings: none (just ear-splitting idol chants) Word Count: 1,058 A/N: Inspired by Ai Hoshino (Oshi no Ko), but this is all fun and chaos. Think: the F1 grid unknowingly becomes the loudest, most embarrassing fanclub at your concert.

✈️ The Setup

Yuki was suspicious. Scratch that—Yuki was acting too suspicious.

Normally, when the calendar hit “Japan GP,” he was the first one grinning about sushi, onsens, and his mom’s cooking. But this time, he was pacing like a man on a mission.

“We go early. A week. No, two weeks. No arguments.”

Cue the grid looking at him like he’d just suggested they all run Suzuka on foot.

“Two weeks?” George repeated, blinking rapidly. “That’s not a race prep schedule. That’s… that’s like—holiday length.”

“Unless you’re hiding Mario Kart world finals from us,” Lando added suspiciously, “because if so, I will find out.”

Yuki scowled. “It’s not about games. It’s… important.”

Lewis tilted his head, studying him with the kind of calm that made everyone else nervous. “Important like… family important? Or important like… food important?”

Yuki hesitated. Too long. Long enough that even Max narrowed his eyes.

“…Maybe both.”

And that was that.

Next thing you know, Toto Wolff was being guilt-tripped into chartering flights early, entire PR schedules were shifted, and the grid found themselves herded into Tokyo for… something.

No one knew what. Except Yuki. And he wasn’t talking.

🎶 The Venue

It wasn’t until they stepped off the train and followed Yuki into a sea of neon signs and screaming teenagers that the truth began to hit.

“Oh my god,” Logan whispered, staring at the posters plastered everywhere. “Are we… at a concert?”

Charles squinted up at the billboard of a girl with bright eyes and a smile so dazzling it almost hurt. “Wait—she looks kind of…”

“Familiar,” Pierre finished, pulling out his phone to snap a photo.

“Yeah,” Carlos agreed slowly. “Like… Yuki?”

Yuki, red-faced, tugged his cap lower. “Shut up.”

The arena was massive. Tens of thousands of fans streamed in, waving lightsticks and chanting already, even though the show hadn’t started.

Lando, eyes wide, bought three glowsticks from a merch stand before anyone could stop him. “They’re color-coded!” he explained, twirling them. “This is… scientific research.”

“Scientific research?” George repeated flatly.

“Yeah,” Lando nodded. “Into how not to be lame.”

Max muttered, “You’re failing already.”

Meanwhile, Lewis was quietly impressed. The stage set-up, the scale, the energy—it all screamed superstar. “Whoever this idol is,” he murmured, “she’s bigger than most Western acts. This is no small deal.”

And then the lights dimmed.

🌟 The Performance Begins

The roar of the crowd was deafening.

Spotlights swept across the arena, music swelled, and then—

✨ You. ✨

The nation’s angel. The idol who had Japan (and half the internet) wrapped around her finger. Your smile lit up the stage as you appeared in a glittering costume, microphone in hand, waving to the sea of fans who screamed your name like a prayer.

The grid? Absolutely losing their minds.

“WAIT—WAIT A SECOND—” Logan yelped, grabbing Charles’s arm so hard he almost dislocated it. “DO YOU SEE THAT??”

Charles’s jaw dropped. “No. No, no, no. That’s— That’s Yuki’s face. Onstage. But—sparkly.”

Pierre practically fell over. “Oh my god, it’s his sister. HE’S BEEN HIDING THIS FROM US.”

Lando, shrieking, “BROOO YOUR SISTER IS LIKE—THE JAPANESE TAYLOR SWIFT??”

Max, deadly serious: “No. Bigger than Taylor Swift. Look at this crowd. Look at this production. She’s—global.”

Meanwhile, Yuki sat smug in his seat, arms crossed. “Told you she’s the best. Shut up and watch.”

🎤 “Idol”

And then you launched into that song. The one that broke streaming records. The one with the impossible fanchants that every single person in the arena knew by heart.

The audience exploded in unison, chanting perfectly timed words between your lines, glowsticks pulsing in waves of color.

The F1 grid? They tried. God, they tried.

George was clapping—two beats late. Lando screamed random Japanese words he’d learned from anime, startling the people around him. Carlos just stood there, looking overwhelmed, muttering, “How is she smiling, singing, AND dancing at the same time? She’s—she’s not human.” Charles looked like he might actually cry. Lewis nodded along, deeply impressed, murmuring, “That’s stage presence. She owns the crowd.” Max, for once, looked awed. “She’s… already at the top. This is it.”

And through it all, Yuki muttered under his breath, “Idiots. Of course she’s good. She’s my sister.”

🎇 Backstage Mayhem

After the concert, the drivers swarmed Yuki.

“You’re introducing us. NOW.” Pierre demanded, grabbing his arm.

“I don’t think security will let you in,” Yuki tried, but it was too late—Charles was already attempting broken Japanese on a poor security guard, Logan was brandishing his glowstick like a VIP pass, and Lewis had simply strolled past with the quiet confidence of a man who had seen it all before.

When you finally walked into the backstage lounge, still in costume, face glowing from the performance, you lit up at the sight of your brother.

“Onii-chan!” you called, hurrying over to hug him.

The grid? DEAD.

Pierre whispered, “She called him Onii-chan. I can die now.” Lando tripped over his own feet trying to bow and yell, “ARIGATOU IDOL-SAN!!” Carlos awkwardly presented you with flowers he may or may not have stolen from the green room. Lewis, calm as ever, asked for a signed poster—“Roscoe’s a fan now.”

And Yuki, dragging you behind him protectively, muttered, “Don’t talk to them too much. They’ll corrupt you.”

📱 Internet Meltdown

Within hours, Twitter/X blew up.

“Why is the ENTIRE F1 GRID at Y/N Tsunoda’s concert holding glowsticks??”

“Charles was CRYING during Idol.”

“Max staring at Y/N like she just invented racing.”

“Yuki hiding the fact that his sister is literally Japan’s biggest superstar?? KING.”

Clips went viral:

Lewis vibing like a proud dad.

George failing the fanchants spectacularly.

Lando’s glowstick dance that somehow started a new meme.

Yuki side-eyeing the whole grid like a tired chaperone.

Trending tags:

#TsunodaSiblings #YNTsunoda #IdolBrotherYuki #F1xIdol

🏁 The Aftermath

By the end of the night, the F1 grid had sworn themselves into your fanclub.

“We’re coming to every Japan concert from now on,” Charles declared firmly. “Front row,” Lando added. George muttered, “I’ll practice the chants next time.” Lewis just smiled knowingly. “She’s already a legend.”

And Yuki? Absolutely traumatized.

“I hate all of you,” he groaned.

But when you giggled and said, “Don’t worry, Onii-chan. I think your friends are cute,” Yuki turned an alarming shade of red— —just as the grid screamed in unison again.

✨End.

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