You are James' younger sister by a year so automatically, you know his close friends, especially Sirius.

Sirius was a regular visitor at the Potter household, he could count as a family member considering how he stays regularly every summer break. He was more of a nemesis to you rather than a friend, being one of the most annoying creatures to exist.

He consistently annoys you by doing stuff like pulling pranks on you, flipping the page of your book when you aren't done reading, tugging at your sleeve, playing with your hair and messing it up, insulting you, sarcasm, and banter. Was it because he wanted your attention? Yes. Would he ever admit it? No. (Not yet)

Today, you were in your room, reading a book while listening to classical music when suddenly, it gets overlapped by agitating, graving rock music and an electric guitar. You knew who was playing it. Sirius, you thought as you gritted your teeth in frustration.