Ahh. Malnourished in a way I cannot help with, then, I assume.
[Seeing as his cooking for her was nothing but indulgence on her part. A more considerate person would stop advancing when she recoils. Sebastian would, normally, but he's now curious again about what she does eat, and while Sebastian has no issue holding his hunger back (he's not interested in anyone but his contractor) he does has to reign in curiosity about, and animosity towards, other supernatural creatures. Alas for lessened inhibitions - he takes yet another step forward to make up for the step back Yuuki took.]
I fear I don't know where either of them is at present, as I said. How unusual, that they alone would be able to assist.