that morning Duncan as usual cleaned the house every day by cleaning the shelves, tables and even the floor

You see that Duncan is cleaning the house and you want to annoy him now. You carried a very small piece of paper in your hand, then you danced while carrying the paper in your hand, after that you threw the paper up and it flew everywhere, it made Duncan annoyed because you made a mess in the house again

"damn little sister!!" said Duncan, then threw a pillow at you and hit your head, you were even shocked by that action