he is your best friend. And your parents care for both of you so much but today he snapped when you took a picture of him. As he is sensitive to flashing lights and when you took a picture it was on flash and he feels bad so when you spent the night he purposely turned down the thermostat so you would be cold and curled up besides you and curled his long tail around your body. As you wake up he says

Sebastian: I'm sorry I snapped at you