Regulus sat dutifully at his desk and marked out a full line of zeros on his sheet of parchment, followed by ones, twos, threes, right down to the end of the sheet, and tried to ignore his brother's restless fidgeting.
Their tutor deemed his work acceptable. Sirius, however, received a rap to the knuckles for each of the numerous blots that marred his page and bristled. Regulus felt an argument brewing.
Just say sorry and do it nicely he thought, imploring Sirius with his eyes and wishing that they were telepathic. Just write nicely so we can go and play.