[Even when it's more of an afterthought of dealing with the fever, Ciel still cares more about Sebastian's comfort than Sebastian does: Sebastian brings a hand to his torso to weakly fiddle with the undone buttons, ineffectually enough that the intention perhaps isn't clear - whether he wants the vest off, or to have it re-buttoned. For what Sebastian's wishes are worth, it's the latter. A butler shouldn't have his vest unbuttoned and his tie loose...]
Now you... are asking questions. [After going so long without asking the relevant ones, Ciel is suddenly so inquisitive. It's silly. And yet:] You don't need to ask me that.
[Is it a belated reprimand for daring to interrogate Sebastian about the Contract? No; he means that of course he'll survive. What a ridiculous thing to ask a demon, when it's so abundantly clear he's just fine.]
...The risotto recipe. ["Use that. It's easy enough." And there's no comment whatsoever on the new order. Perhaps Sebastian forgot about it already.]