Allan: That's the first time I see you smile.
I wouldn't do it actually. It's not your best look.
Kate: Do you know, looking at you actually
makes me want to be a little bit sick. She gets
sick when looking at him?
[I hope Allan and Kate are not "involved". Emotion: ick! ]
The fact of looking at him makes her feel that way.
 Philip's reply was promoted to an answer.