This is the smirking or cheeky face which applies to the book when Achilles orchistates a meeting with Ender to try and get him to say something to sway the public's opinion away from Ender. The text reads," But I've been wanting to see you, and I think the governor has been trying to keep us apart. I know you have been aching for this moment". Ender knows that Achilles set up the meeting and is referencing that he knows in a very tongue amd cheek way.
This is