Both outburst and question startle her, her eyes shooting back to him. "No." She flushes -- probably she shouldn't be talking to him like this; obviously she's said something wrong if he's even asking the question in the first place. "Mou -- I'm sorry, Conan-kun; of course I don't want him to go."

He is very attached to "Shinichi-niichan." He really likely shouldn't be hearing all of this.