At the very least, Christmas traditions are hardly set in stone. They change quite frequently, actually...

[ Well, so far as Sebastian is concerned. If traditions change every century, then it seems quite quick to him... So maybe he's actually a bad person to ask about this. The mischievous expression on her face is something that he recognizes, but at least Ciel isn't here to be subject to it. Which is actually a shame, honestly, because Sieglinde gently and unintentionally bullying Ciel is gold. ]

Oh? Yes, I did see people—ah—affected by it a few days ago. It is a bit clever, though dear me... With that expression, did you happen to extort one of your own, Master Sullivan?