[For some reason Suzaku's presence makes him feel a little guilty, a little less inclined to the bravado that he's so familiar with; and Suzaku is so confident in him, so willing to defend him. While he's protecting himself again. Lelouch flickers his gaze to the side, and then up again to make Cornelia's. A little less cold:]
She was doing it for Nunnally. [Just that. It's all the explanation he needs. He wouldn't have lied about abandoning his plans for Nunnally's sake, and he wouldn't have hurt someone asking on Nunnally's behalf.