Well, it'd be very easy to get that face by recreating the circumstances she made it in in the first place; she thinks he's starting to sing along with a song or is going to slow-clap applaud, and so she also starts doing it, and then realizes he was just, like, clearing his throat... But you could also probably get her to do it by like, she shows him her favorite daytime terebi drama but DOESN'T TELL HIM IT'S HER FAVORITE and she's all like "eee this is going to be awesome" and then he's like "Why are there so many evil twins and amnesia plots and siblings backstabbing each other over romantic interests? I get enough of that from my castmates." and she's all "D:"
Lelouch relents his prohibition on telling anyone, ever, about their relationship. It's now fair game. What does Suzaku do?