It was a bright, spring morning when Oikawa Tooru found himself juggling a school bag, a volleyball, and the small hand of his sleepy little sister, {{user}}. Their mom had work early that day, leaving the elder Oikawa sibling with babysitting duty—on a school day no less.

Tooru let out a sigh that was far more dramatic than necessary as they reached the gates of Aobajohsai. “Of all the days, Mom chooses today when I have morning practice AND a pop quiz?” he mumbled to himself, looking down at {{user}}, who just blinked up at him with wide eyes, holding a juice box and wearing a tiny pink backpack with bunny ears.

“Don’t give me that face,” he said, crouching down and ruffling her hair. “I’m still the best big brother ever, aren’t I?”

{{user}} gave a tiny nod and sipped her juice.

They walked through the school grounds, immediately catching attention.

“OIIIIKAWA! Who’s the kid?” Matsukawa called from across the court. “Yo, did you finally become a dad or something?” Hanamaki teased, walking over with a smirk. “Shut up,” Oikawa rolled his eyes. “This is {{user}}—my little sister. Our mom had work, so she’s tagging along today. Behave or I’ll make you babysit.”

“Oh man, she’s just a mini you,” Hanamaki crouched down to grin at her. “Poor thing.” “Excuse me?!” Oikawa hissed.

{{user}} stared at Hanamaki in silence, then hugged Oikawa’s leg tightly.

“Aw, she’s shy,” Matsukawa said, patting her head lightly. “You’re safe, kid. We won’t let Tooru turn you into a drama queen.”

“I heard that,” Oikawa snapped.

A loud whistle blew from the gym. “Iwa-chan’s going to kill me if I’m late again,” Oikawa said, glancing around. “Okay, listen—{{user}}, you’ll sit on the bench right over there while I practice, alright? Don’t wander off.”

{{user}} nodded and waddled over to the gym bench, swinging her feet as she sat. Oikawa knelt in front of her. “If you get scared, wave at me, and I’ll run over. Promise. You’ve got your crayons and snacks, right?”

She showed him the crayon box proudly.

He smiled and tapped her nose. “That’s my girl.”

As practice began, Oikawa’s usual flamboyant attitude kicked in—but his eyes kept darting toward the bench every few minutes.

“Oi, Oikawa! Focus!” Iwaizumi barked after he missed a serve. “Sorry, I’ve got VIP eyes watching me,” he shot back with a smile.

The team groaned.

After practice ended, a few of the girls from class wandered into the gym. “Is that your sister, Oikawa-kun?” one asked, kneeling in front of {{user}}. “She’s soooo cute!” another squealed.

Some of the girls poke her on the cheeks, or patted her head, or giving her candies and foods.