[--Lelouch is annoyed. He is annoyed, and standing near his house, and sort of swaying from foot to foot sullenly. It's not that he can't dance, not by a long shot. It's just that he is so irritated at not being allowed to be in his house, doing what he wants. And this music is too loud and completely tasteless. He'll attempt to make pleasant conversation with anyone who comes up to him. Probably.
[...as the time passes his swaying will also probably get less annoyed and more tired of being on his feet. You might have a better shot of talking to him then.]