A : Because after all this practise in school, it'd be impossible for someone to follow me without me noticing. I'd probably have disapeared from sight or purposely lead you to a trap that I set somewhere. Later I'd be the one following you and learn secrets that you'd kill to keep hidden. After that I'd meet you by "luck" somewhere and act cool and all until we are alone and I say something shocking that I couldn't possibly know and have an epic superior moment with low lighting and stuff.
A : I decided I want to be Lelouch now. The others chose one who fits their personality and character and I don't want to run naked around the house anymore.