And very amusing it is to watch,” said Jem. “Did you know you twitch your nose when you sleep, like a rabbit?”
“I do not,” she said, with a whispered laugh.- In my dreams (Chapter 17) deleted scene- Clockwork Prince

She smiled at him. “How did you know just what I’d want to see?”
“How could I not?” he said. “When I think of you, and you are not there, I see you in my mind’s eye always with a book in your hand.” He looked away from her as he said it, but not before she caught the slight flush on his cheekbones. He was so pale, he could never hide even the least blush, she thought — and was surprised how affectionate the thought was.

Say something in Mandarin,” said Tessa, with a smile.
Jem said something that sounded like a lot of breathy vowels and
consonants run together, his voice rising and falling melodically: “Ni
hen piao liang.”
“What did you say?” Tessa was curious.
“I said your hair is coming undone — here,” he said, and reached out
and tucked an escaping curl back behind her ear. Tessa felt the blood
spill hot up into her face, and was glad for the dimness of the
carriage. “You have to be careful with it,” he said, taking his hand
back, slowly, his fingers lingering against her cheek.

Being Jem, Tessa reflected, must be a great deal like being the owner of a thouroughbred dog that liked to bite your guests. You had to have a hand on his collar constantly.

Jem is nothing but goodness. That he struck you last night only shows how capable you are of driving even saints to madness.