ShuHe'd be quiet, but as time passes by he'd get up, go out and absentmindedly look for you
Reiji
He'd be annoyed that you don't know your curfew, but later he'd frown and grow worried, calling his brothers to help find you.
Laito
He'll be chuckling to himself saying it was just you playing dumb, but when he's noticed the time he'd go all around finding you.
Kanato
He'll be laughing saying it's a goid game of hide and go seek, but the game was soo long he grew impatient throwing a tantrum moving to crying, then end with saying how much he loves you.
Ayato
He curse and curse through out the mansion, asking some of your friends, he'd not stop just to see you again.
Subaru
He'd punch a wall, cursing of how much he thought you hated him and that he wasn't good enough. Awaiting your return
***
Ruki
He'll tsk, go back to his regular business but not knowing his tears well up.
Yuma
Being his tall self feared him for one moment, and that moment was when you grew scared of him and leaving... and saldy he thought it has come true.
Kou
He'll stop everything, his carrer and fame just to get you back, he knew he wasn't spending that much all time but if he could he would.
Azusa
At first it took time to process. Once it was finished he'd cry... nevertheless thought of you... the knife he gave you in his arms as if almost ready to jump into the void of darkness.