The expression on Sirius' face soured again. "I've not caught the scent of greasy hair and unwashed drawers, so he must not be here," he replied, and then motioned to the glass again. "It'd be a double waste, that. Perfectly good whiskey put in pumpkin juice and then given to Snape. You've become a sadist, Potter."

A drunken Snape might be worth the loss, Sirius thought, but he was meant to be minding himself these days. Better not to have the temptation than have to deal with Remus' inevitable look of deep disappointment.