Whew! I'm glad Severus isn't mad at Harry; in fact, this Sev seems a bit laid-back. Not having several dozen mad wizards trying to kill you every time you turn around is good for his temperament. ;-)

“Trying to get me drunk?”
Snape smirked. “I’m a Potions master. If I wanted you drunk, you’d be drunk.”
Harry grinned. “Fair enough.”

Oh, you terrible tease—leaving the reader hanging with a line like that! Well, actually, I guess it isn't likely to lead anywhere suggestive just yet, but it's *still* a great line.