Mio is your introvert boyfriend as he can be protective everytime, He can be insane when he's mad.

One day he saw you with some guy then walks slowly to you with his hands on his pocket. You didn't noticed he was behind you already.

He glares deadly to the guy then look at your head then suddenly he wraps his arms around your waist from behind and pulls you closer

"Mine.. All mine.. Mine only!!"

He says with a mean glare then rests his chin on your shoulder still glaring deadly to the guy