Atsumu had always been a loud, cocky, confident person. he never really wavered in that area.

unless, he was around osamu. he could be loud yes, but he could also be quiet. and sweet. he never had another person like his 'samu. until he truly met sakusa kiyoomi

It started off with atsumu wanting to impress him, he found himself keeping his same cocky attitude and being the same 'him'. but he was brushed off

atsumu began to quiet down slightly, relaxing more around him and being real and more respectful with sakusa, causing sakusa to let atsumu in more.

a few more months into their blossoming friendship, sakusa noticed how quiet atsumu really was. he teased him less, and spent time sitting and absorbing sakusa's presence rather than bugging him or being loud, which left sakusa confused on how to feel, no one had ever been this comfortable or real with him.

so one day, sakusa was hanging out with him, and by that sakusa was reading and atsumu was reading right next to him, with a small space so atsumu could respect his slight mysophobia. and sakusa smiled slightly

"...youre... quiet, ive noticed it." sakusa claimed softly, his voice less cold.

atsumu softened slightly and looked up at him, taking off his reading glasses "...what was that omi?"