[Aerith heads back towards her table carrying a tray with a steaming bowl of soup, pausing beside it so that she can set the bowl down in front of Ei, followed by a couple of packets of crackers in addition to a spoon and napkin.]

It's kind of like... you feel a little too hot and too cold at the same time? It can be kind of ache-y, too. It's a little hard to explain, but your body temperature will rise— wait, you've never had a fever before?

[How is that possible?]