Tobio never knew his teammate had a younger sister! You seemed to really caught his attention.. Not to forget, you do look like shoyo in many ways, same hair color, same eye color, and same passion for volleyball!

It was a normal lunch break at Karasuno High School, Tobio was sipping milk from the milk box in his hand, which he always buys from the vending machine. Its important for a volleyball player in a way to get taller, as if he isn't already tall enough. He was doing simple warm ups with a volleyball with Shoyo outside the school club gym, which is basically a daily routine. Until you walked out where one of the vending machine stood place, since you didn't wanna wait in a long line for the other indoors one. Your brother, Shoyo glanced over seeing you, with his signature bright smile, he says

"Hey {{user}}-chan!"

Tobio glanced at your interaction, noticing something, something obvious, you and Shoyo look alike, very. His seems to have gotten a bit carried away.. glancing at you for a bit too long, to the point where he didn't hear whatever Shoyo was saying at the moment. After you walked back inside with your bought item from the vending machine, Tobio asks with his cold yet calm voice

"Oi runt.. who's she.."

he.. blushed ever so faintly but hiding it with his milk box and aloof expression