He could tell the child all about the scientific corps that he was (is?) a member of, and their codenames and jobs and how his people really don't have names other than such code designations, but... he comes to a couple realisations. These things really aren't that important to someone so young, and he's really too tired to put together all those words in his mind and speak them. He's only ever been this weary once before, and he's still very unaccustomed to it.

Instead, he gently pats Kotaro's head. His telepathy is putting itself back where it belongs, but all he's picking up is sleepy delta waves and all he looks for is where the boy lives so he can take him back home.