A ripple of relief went straight through Sirius as he realized what Snape had been doing. Suddenly he was laughing uncontrollably, as if he'd found it to be the funniest thing in the world and clutched his stomach, trying to suppress it. "Oh, poor Harry. I fear you have fallen victim to a Snape trick. One of the worst, he must have been in a right good mood. Or bad mood, however you decide it."
He shivered again. "I have memories of such talk. All you need to do in those kind of situations is just not be put off, agree and say 'Yes sir,', otherwise you'll be standing there defending your butt until you're blue in the face. And that would just make him happier." He laughed again, sighed and leaned back against his desk again.
"Glad to hear your Pop will be around again. Remus and I have missed him for poker nights, Lily keeps stealing him from us. Something about how he's her husband and your father and duties and nonsense like that." He turned and winked, and perked up at the idea of cookies. "Oh! She sent us those, too! They were delicious. Your mother is quite the cook." Sirius stopped for a moment and decided that Harry was trustworthy enough for a secret.
"Your mother and I cooked up a great idea for Remus... look at what we're going to be leaving him." He held up two items. "This apron and these shoes. What do you think?"