No words! Not that Kaito dislikes Mai's voice or what she has to say; sometimes she says things it's difficult for him to hear, but it challenges him and that's good. But being able to shut her teasing mouth for a moment feels amazingly good; it means he's done something so right that she's speechless to deal with it. He can't help his smug smirk.

"Yes, then," he says, mostly to himself. "Tell me if things go too far..."

After all, he respects her far too much to force her. He would never need to force someone! Kaito trails the melting ice cube a little bit further down, so that it's heading to the valley between Mai's breasts.