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Sidelines [Alt title: My f(x)]

Summary:

//highschool arc: suna x fem! Inarizaki! reader

I was falling in love on the sidelines, while treading right over both of our boundary lines.

[first interaction]

Notes:

This is like a one shot but also a prologue/background for all or most of the fanfics I write for Suna Rintarou. HIGH SCHOOL SWEETHEARTS IS LITERALLY THE CUTEST TROPE I SWEAR. Sorry for any misuse of language in the volleyball match descriptions as I don't play volleyball in English (lol)

Hope you enjoy!!

Work Text:

The roar of the Tokyo Metropolitan Gymnasium was a physical force, an overwhelming wave of sound that vibrated up through the bleachers and into my bones. But for the twelve of us in our Inarizaki girls' team jerseys, the noise was just like mockery. We weren't just spectators; we were learners. Our coach, a stern woman with a clipboard permanently grafted to her hand, had made that abundantly clear.

 

"Watch their footwork," she barked, her voice cutting through the chaos. "Not just the spikes. Watch their defensive positioning. See how Shinsuke-kun anticipates the angle of attack before the setter even touches the ball? That's what top five in the nation looks like."

 

I shifted around on the hard plastic seat, my own muscles aching in desire to go back onto the court. We’d been eliminated in the quarter-finals yesterday, a hard-fought loss that had left us infinitely humbled. Sitting here now, watching the boys' team — our boys' team, the school's pride and joy—warm up for their semi-final match, was a mix of inspiration and salt in the wound.

 

Next to me, Asuka Miya vibrated with a different energy entirely. "There they are!" she squealed, practically bouncing out of her seat. "Look! 'Samu's serve is looking sharp today!"

 

I followed her gaze to the court below. The Inarizaki boys moved with an indifferent, powerful confidence that was both dazzling and mildly intimidating. I knew their names, their numbers, their positions by heart. We shared a gym, after all. Our practices often overlapped with theirs, the sounds of our volleyballs a constant, overlapping rhythm. But they were on a different level. The Miya twins, Atsumu and Osamu, were local legends. Aran Ojiro, the ace, was practically a celebrity. And I, a first-year reserve middle blocker on a middling girls' team, was no more than a mere rock on the side of the road.

 

My eyes, trained to analyze movement and strategy, scanned the court. They moved from the calm, authoritative presence of Kita-san to the imposing bulk of spiker Ojiro-san . And then they snagged on number 10.

 

Suna Rintarou.

 

He was stretching near the net, his back to us. Tall and lean, with a mess of soft, curly brown hair that seemed to defy both gravity and the strict confines of a volleyball haircut. His warm-up was different from the others. Where Atsumu’s tosses were flamboyant show-offs of skill and Osamu’s spikes were thunderous statements of power, Suna’s movements were languid, almost lazy. But my player’s eye could see the efficiency in it—the fluid, unhurried grace that spoke of muscles flexing and ready, of energy conserved for the critical moment.

 

"He looks half-asleep," I murmured to Asuka.

 

She grinned, her eyes sparkling. "That's his trick. He's like a real fox. Lulls you right to sleep, then... bam!" She clapped her hands together. "Best read-blocker in the prefecture. Maybe the whole country."

 

The match began, and the atmosphere snapped tight as an elastic band. This wasn't just watching; it was a masterclass. Our coach’s voice became a running commentary. "See how Atsumu-kun uses his fingertips? Not the palms! That's control! That's what I want from you setters!"

 

I watched, mesmerized, as the ballet of power and precision unfolded. The ball became a blur, the rallies impossibly long. Then, it happened. The opposing team’s ace, a powerhouse from Shiratorizawa, went up for a spike. The ball left his hand like a cannon shot, aimed for a sharp cross-court angle that seemed undefendable.

 

My breath caught. I knew that shot. I’d been on the receiving end of similar ones yesterday. There was no stopping it.

 

But Suna was there.

 

He didn't rush. He didn't panic. He seemed to simply calculate his way into the perfect spot. His jump was a study in biomechanical perfection—perfectly vertical, impeccably timed. His long fingers, splayed wide, didn't just meet the ball; they embraced it. There was no brutal, loud smack. Instead, there was a precise, almost soft thud as he absorbed the ball's immense force, his wrists tilting ever so slightly to deflect it straight down back to Shiratorizawa’s side of the court.

 

A one-touch. A kill block.

 

The gym exploded into rousing acclamation. But Suna? He landed silently. No roar, no fist pump. Just a faint, almost unnoticeable smirk that didn't quite reach his eyes. He glanced at the spiker he’d just dismantled, and it was a look of pure, cool disdain.

 

Something clicked into place inside me, with the satisfaction of a lock turning into place. This wasn't just physical competence; it was intelligence. It was geometry and physics applied at lightning speed. He was a strategist, a problem-solver on a court full of brutalists and artists. As a middle blocker, my entire role was about observation and prediction. And he was the virtuoso of it.

 

From that moment, my world narrowed to #10. I watched him with the intensity of a researcher. I saw how his fox-like eyes, sharp and perceptive, constantly scanned the court, processing data I couldn't even see: the setter’s decision making, the angle of a spiker’s approach, the micro-expression of targeting. He was the team's silent, brilliant processor.

 

The match was an elegant yet brutal showcase of Inarizaki's strength. Atsumu’s sets were works of art, Osamu’s spikes were relentless, and Aran’s power was a force of nature. But every time the opposition thought they had an opening, Suna was there, a definite wall of quiet intellect, shutting them down. His blocks weren't just defensive plays; they were psychological warfare. You could see the doubt creeping into Ushijima’s eyes every time he approached him.

 

During a timeout, with the twins in a heated debate and Aran playing peacemaker, Suna stood slightly apart, taking a slow sip of water. He looked bored, if anything. He caught Asuka’s energetic waving and gave a lazy, two-fingered salute. Then, his gaze—disconcertingly sharp—flickered over our group of girls in matching jerseys. It swept over me, a neutral, passing glance, but it felt like a laser point. My heart, an organ I understood in terms of ventricles and valves, decided to conduct an unscientific experiment in arrhythmia.

 

The match reached its climax in a tense fifth set. Inarizaki was at match point. The opponent ran a complex X play, with the setter shooting the ball in a perfectly horizontal line straight ahead.  It was a beautiful yet deceptive move, like a precious fresh rose with thorns all over waiting for you to pick. One wrong decision and it’s all over. This was the exact same move that had torn our own defense apart again and again yesterday. (??? idk how to word this in english HELP. So basically the middle blocker does a C-quick at the right just behind the setter, the outside hitter does a B2-quick, the back-row outside hitter does a spike in the middle of the court at the 3m line, and the opposite hitter does a normal 5 that crosses middle blocker’s path. The outside hitter hits the ball in the end. I HOPE THIS IS UNDERSTANDABLE)

 

My blocker’s brain couldn’t even process it in time. He’s going to be late.

But Suna wasn't. He didn't get duped by the first fake. He stayed grounded, in a state of coiled potential, his eyes locked on the setter’s hands. Then, at the exact moment the ball left the setter’s fingertips, he moved. It wasn't a jump; it was an eruption. He met the ball at its absolute peak, his block forming an impenetrable wall. The ball shot straight down. The sound was devastating—a clean, final crack that echoed through the suddenly silent gym. This final, flawless note hung in the air, leaving only a silence that will never be filled.

 

The whistle blew. Inarizaki won the fifth set with 19:17.

 

The boys' team erupted into a chaotic, sweating, shouting pile of victory. Suna was swallowed by it, and for the first time, I saw a real, wide smile break through his calm facade. The sight sent a warm, illogical flush through my entire body.

 

As we hurried down to the court-side, our coach was already debriefing us. "Did you see that? That's anticipation! That's reading the game three moves ahead!"

 

But I wasn't listening. My eyes were fixed on the celebrating team. Asuka broke away from us and launched herself at her brothers. "You guys were amazing!"

 

Atsumu ruffled her hair. "Of course we were."

 

It was then I found myself standing awkwardly near the benches, my teammates chattering around me about the terrific play just now. And that’s when I saw him. Suna Rintarou, detaching himself from the group, a towel draped around his neck. Up close, his features were overwhelming. The soft, curly hair was plastered to his forehead with sweat. His hazel eyes, framed by those absurdly long lashes, were bright with post-victory adrenaline. And he was… prettier than any boy had a right to be, with a sharpness to his features that was both elegant and intelligent.

 

He noticed me staring. A faint, pink blush instantly crept up his neck, staining his skin above the collar of his jersey. He looked away, suddenly finding the floor fascinating. The contradiction was breathtaking. The infinitely calm and collected genius, the sly predator on the court, was shy. The striking contrast made my mind fuzzy.

 

Asuka, as the lively social butterfly she always is, grabbed my arm and pulled me forward. She leaned in close to the group, her stage-whisper meant to be a secret, but it landed with the intensity of a shout in my ears. 

 

"She thinks your blocking is 'biomechanically perfect'!" she blurted, paraphrasing my earlier muttered awe with devastating accuracy.

 

I wanted the polished court to swallow me whole. To my relief, the boys seemed not to have heard what Asuka said. Atsumu was looking at a play on the far court, and Osamu was taking a sip of water. But Suna's gaze snapped to me, his head tilting in that familiar, fox-like way. He'd caught every word.

 

"Biomechanically perfect?" he repeated, the hint of a smile touching his lips. His voice was a low, calm rumble that felt entirely separate from the gym's hustle and bustle. 

 

"No one's ever put it like that before. Usually, it's just 'scary'."

 

Interested by the slight commotion, the Miya twins joined their sister to watch the spectacle.

 

Encouraged by his lack of mockery, my nerves settled into analytical mode. "Well, it is. Your vertical is impressive, but it's your timing. The millisecond delay on that last block to account for the setter's deception… it was… brilliant."

 

The twins blinked. A flicker of amusement softened his eyes, then the corners of his mouth lifted almost imperceptibly, as if a private, pleasant thought had just dawned on him. It was a real, unguarded smile that reached his eyes and made them crinkle at the corners. It was a sunshine smile, entirely at odds with his on-court persona, and it hit me with the force of a full-speed spike.

 

"Yeah," he said, his ears turning a bright shade of vermillion. "That's… that's exactly it. You play blocker too?"

 

"Second-string," I admitted.

 

"Great that you get it," he said, and it felt like a secret handshake, an acknowledgment between two people who saw the game not just as a sport, but as a complex, beautiful puzzle.

 

The moment was broken by the team's decision to go for food. We, the girls' team, were swept along in their victorious wake. At the ramen shop, crammed into booths, I found myself sitting diagonally across from Suna. He was mostly quiet, listening to the twins' loud recounting of every point, but I caught him looking at me a few times. Not a stare, but just a quick, curious glance.

 

Acting on the same impulse, we both reached for the soy sauce sitting between us. My movement to add a splash to my broth was perfectly synchronized with his own. Our hands encircled the plastic bottle, close enough to sense the warmth radiating from his skin but not quite touching. A sudden, self-conscious pause froze us both. The simultaneous decision to pull back was almost comical, a silent assurance of the strange moment that had just passed between us. 

 

Our eyes met. I saw him run a hand through his curls, a nervous gesture that was becoming endearingly familiar.

 

As we spilled out onto the street, the cool night air a shock after the steam of the ramen shop, he fell into step beside me.

 

"So," he said, his hands shoved deep in his jacket pockets. "You really think my blocking is that brilliant?"

 

I stopped walking briefly, my sneakers scuffing softly on the pavement. He took two more steps before realizing I was no longer beside him. He turned back, a flicker of confusion in his eyes as he waited.

 

 "I think it's the most intellectually satisfying thing I've seen on a volleyball court," I said, my courage enlarged by the darkness.

 

He chuckled, a low, reassuring sound. "Our practices are always open. For the girls' team, I mean. You could… you know. Get a closer look at the raw data."

 

I stole a glance up at him. He was already looking at me. The shyness in his eyes was still there, but so was that spark of shared understanding, the connection between two people who spoke the same silent language of angles and anticipation. 

 

"I think my training schedule just became a lot more interesting," I said, a genuine smile spreading across my face.


He smiled back, full and bright, and in that moment, I knew. I was falling in love on the sidelines, while treading right over both of our boundary lines. The carefully planned graph of my life had just been irreversibly altered. A new, unpredictable variable had been introduced, and I was already, hopelessly, and hypnotizingly falling in love with this f(x) called Suna Rintarou.