Chuck smirked at Blair's response to Serena (she really didn't get enough credit for her wit) and then had to cover the beginnings of a snicker when she very nearly fell off of her stool. If she had any more her speech would probably fast become slurry, and that would be even more entertaining.
"You're not removing an article of clothing, you're removing multiple articles," Chuck pointed out, as if this would somehow make him more trustworthy. "And besides, you're protected under the laws of friendship. Nate knows that I know better than to seduce my best friend's girl." He cast a brief glance at Serena. "No offense," he said, deadpan, in a tone that didn't really convey that he meant it.
"Also, do you really want to be walking around like that? You'll feel better once you have on clean clothes."