Burn All of Mikuru's customs
Delete all pictures of Mikuru
Hack their computer
Break their computer
Steal their computer
Alter the SoS Brigade, delete all Mikuru posts and any articles.
Act super normal during meetings
Ignore her
Say "Kyon, your mine!" the proceed to to pounce on him and kiss him.
Bring Asakura back and set her on Kyon.
Steal their camera
Burn SoS Brigade flyers.