Lelouch: -Innocently- Really? I don't remember you complaining when we made it up to my room and…
Kallen: DO YOU WANT ME TO SHOOT YOU!? DO YOUREALLYWANT ME TO SHOOT YOU!?
Really, Lelouch seems to get a kick out of teasing Kallen. He does something similar in Chapter XX. While posing as a married couple in the Vermillion Forbidden Palace, Lelouch says that [he] loves her right after the two review their plan. For a moment Kallen forgets that they're undercover and nearly stumbles over.
Kallen's reaction to Lelouch exercising in Chapter 19.
Inoue: Actually, I think Miss C.C. has good reason for having her knightmare painted that color. I mean, it's not like she has to worry about the Britannians picking her out, and getting shot down by a pink knightmare would only humiliate them further.
Rakshata: But it's humiliating to him as well! Being coated in such a horrid color! He's become transvestite!
Charles and Marianne lightly bickering over who Lelouch takes after more: his mother, or "the man who's waging a world war just to keep an audience occupied".
During Chapter XX, Kallen is being harassed by a snake named Ling Yun... and no, not that kind of snake. The guy is a midget that is described as more of an upright lizard than a human being, and has a personality to match. A pervertedCasanova Wannabe that tries to hit on Kallen, despite knowing that she's married (more accurately she and Lelouch are Undercover as Lovers). When Lelouch shows up, he quickly Geasses the snake with two commands. The first is to follow the instructions in the envelope Lelouch hands him (Ling Yun is the Minister of State Security for Area 22/China). The second? "You're [Ling Yun] now a diarrhetic." Almost immediately Ling's stomach makes an audible noise and he runs to the nearest bathroom.