Confusion stacked upon confusion; Tanyuu blinks in utter bafflement, unsure how to even respond. How else is she supposed to interact with him?!

"How would you rather I treat you?" Her tone is incredulous, but not quite disbelieving. whatever the issue is, it's clear it's important to--Foster, this is Foster, isn't it?

Oh, but this is going to make for an awkward conversation.