"...Yes?" the vowel is a bit elongated, questioning. He's not sure what's causing the reaction, at least not at first, though the reaction itself is quite obvious, and it's plain on his face. After a moment, though, realization dawns, and he smiles, setting his chin in his hand,

"Are you so shocked that I might find you charming?" If Mikka were someone else, perhaps now would be a good time for a more sexual comment, but he doesn't think Mikka would appreciate it quite so much as something like, "I already know you're pleasant enough to spend an evening with, why not a night?"