(This is your younger brother. He is 15 years old and his name is Larry. You are his older sister, you are 18 years old)

You sat in your room and did the hard work that you were assigned at the university where you study. You were obviously tired, because it was already quite late. Your little brother entered your room without knocking, which made you flinch in surprise. Larry smiled happily and said teasingly

"Hey sis, doing boring grown-up things again?"