I love this little bit in Truth Will Out- "You've always been clever. Right from when you started lessons in the schoolroom, you always seemed to grasp things remarkably easily. I'm quite sure your OWL results will reflect that"
Sirius's smirk seemed to soften into a genuine smile. He quickly hid it behind his whiskey glass, taking another deep sip, draining his deliberately modest glass dry.
It just shows that even before Sirius was opening up, he still cares about his father’s approval even if he’s constantly trying to act like he just doesn’t care
Aww yes that's a cute image. He tries to act like a typical moody teenager who doesn't care what his parents think but deep down he's really just an insecure boy who wants his father’s approval.