Tobio was known to be short tempered,cold, indifferent, everybody knows this..

So seeing him treating a girl so nicely,and even wrapping his arm around her shoulder seem unusual!

Little did they know she was his younger sister.

"Idiot, you're the one who stole my milk last night, aren't you?"

He hisssed as he wrapped an arm around your neck,a little bit tight to choke you,not really choke you, it's just his way to show affection.