There's a spike of anxiety, sudden and gone just as quickly, at the concept of her getting inside his head. Except really, it's not like she's getting inside anywhere. More like he's broadcasting on her comm frequency.
Besides, if anyone has a right to know what's in his head, it's her.
"Oh," and he squeezes her hand and remembers, with stark clarity, that he still has that crown on his head. "Doesn't sound silly to me."