Well, it was just that no one should be able to go that long without experiencing a hangover! It was educational. Really, Sirius had been doing him a favour. Really, if you thought about it, he was quite noble, he was just helping Remus loosen up a little. And considering, you know, everything, Remus really needed to loosen up a little. Sirius Black: werewolf tamer extraordinaire.
Sirius clattered down the stairs with enthusiasm, now that he had Remus safely ensnared in his plans. "That is a filthy lie," he said, turning to glare up at Remus in mock horror. "No one could ever take my place. Are you suggesting I am replaceable? Maybe I'll replace you, see how you like it." Which would never happen, as Sirius was quite fond of Remus, despite the other boy's total lack of creativity when it came to "things we can drop on firsties."