Osamu very nearly cringes when he sees Kita mimic his posture, not because it's inherently disturbing, but because he immediately recognizes it as Atsumu's own excited fidgeting and hates to think that he's got an identical habit. He's made peace with the fact that he and Atsumu are identical twins, it has been 17 years after all, but some similarities are much less embarrassing than others, and this one is pretty bad.

Quickly, he makes himself stand up straighter and spreads his feet a bit further apart, flat on the ground.

"Geez," he mutters. "So I'm like a little kid when it comes to bein' obvious, huh?"