Well, I don't think Itsuki is overreacting at all. It's not the fact that Kyon lusts for Mikuru, that part is plain as day. He's reacting to the fact that Mikuru is now lusting for Kyon, and is gradually becoming more daring from throughout the Anime up to now. This theoretically could lead to Kyon and Mikuru getting together, and thus Haruhi resets the world, clearly a life-threatening problem. Thus, his goal is to keep Haruhi happy, even if he has to implement shady tactics and use his powers. Plus, you have to consider the fact that the Anime is nearly entirely in Kyon's perspective, so Yuki (who in my opinion is considerably more God-like than Itsuki) and Itsuki both have mysteriously undefined powers. Clearly Itsuki miscalculated when he knocked over the teacup, and so he decides to use telepathy to send the message instead of pulling her aside in cause others (especially Haruhi) become curious. After all, Itsuki is normally the mysteriously amiable transfer student, but here he has plenty of thoughts and things to keep in check in his own way.<br/><br/>But, if you guys want me to edit that into an under-the-table text message, I can.<br/><br/>And also, I have Itsuki as a perceptive but not particularly wise character. He's a more "in the moment" person who will use whatever powers or organizational connections he can to keep everything in check in the present, while somewhat trying to avoid doing it all. Let me point out that Itsuki is "Deputy" because he gets everything that Haruhi wants, one way or another. But delivering Kyon to her is something he has considerably less control over, and he wants to eliminate any problems he sees immediately.<br/><br/>Does that all make sense now? I'm not exactly using Itsuki to destroy the world, just to keep Kyon in the dark.<br/><br/>Additionally, I don't think it's in character for Kyon to ask what they're doing today, normally it's unfortunately thrust upon him by Haruhi and the others somewhat go along with it.