Jace was still staring at her as if she'd told him she'd found out one of the Silent Brothers doing nude cartwheels in the hallway.

Do you want to tell me what this is about, or should I just call the police?"
"And tell them what?" Jace said witheringly. "That invisible people are bothering you? Trust me, little girl, the police aren't going to arrest someone they can't see.

"Don't tell me," Jace said, "Simon's turned himself into an ocelot and you want me to do something about it before Isabelle makes him into a stole. Well, you'll have have to wait till tomorrow. I'm out of commission." He pointed at himself - he was wearing blue pajamas with a hole in the sleeve. "Look. Jammies."
"Jace," Clary said, "this is important."
"Don't tell me," he said. "You've got a drawing emergency. You need a nude model. Well, I'm not in the mood. You could always ask Hodge," he said as an afterthought. "I hear he'll do anything for a -"
"JACE!" she interrupted him, her voice rising to a scream. "JUST SHUT UP FOR A SECOND AND LISTEN, WILL YOU?"

Simon was looking at Jace as if he were both fascinating and also a little alarming. 'Did I-- did we ever-- did I bite you?' Jace touched the scar on his throat. 'I can't believe you remember that.' 'Did we... roll around on the bottom of a boat?' 'Yes, you bit me, yes, I kind of liked it, yes, let's not talk about it again,' said Jace.

"Sebastian just smiled. “I could hear your heart beating,” he said softly. “When you were watching me with Valentine. Did it bother you?”
“That you seem to be dating my dad?” Jace shrugged. "You’re a little young for him, to be honest.”
“What?” For the first time since Jace had met him, Sebastian seemed flabbergasted.

It's a girl," Jace said, recovering his composure. "Surely you've seen girls before, Alec. Your sister Isabelle is one.

What makes you think that Valentine's change of plans had anything to do with your brother?"
"Because only Jace can piss someone off that much.

I'm not sure anyone can make Jace do anything. But I think you can remind him that he has something to live for.

"Don't." Clary raised a warning hand. "I'm not really in the mood right now."
"That's got to be the first time a girl's ever said that to me," Jace mused.

I didn't," said Jace. "At least, I didn't finish it. It's Magnus Bane." He grinned at Alec mockingly. "Rhymes with 'overcareful pain in the ass.'

"Out of the corner of her eye she thought she saw Jace shoot her a look of white rage - but when she glanced at him, he looked as he always did: easy, confident, slightly bored.
"In future, Clarissa," he said, "it might be wise to mention that you already have a man in your bed, to avoid such tedious situations."
"You invited him into bed?" Simon demanded, looking shaken.
"Ridiculous, isn't it?" said Jace. "We would never have all fit."
"I didn't invite him into bed," Clary snapped. "We were just kissing."
"Just kissing?" Jace's tone mocked her with its false hurt. "How swiftly you dismiss our love.

"Investigation?" Isabelle laughed. "Now we're detectives? Maybe we should all have code names."
"Good idea," said Jace. "I shall be Baron Hotschaft Von Hugenstein."

"How awfully convenient for you, regardless. And for him. He won't have to worry about you spilling his secrets."
"Yeah," Jace said. "He's terrified I'll tell everyone that he's always wanted to be a ballerina."

"Jace?"
"Yeah?"
"How did you know I had Shadowhunter blood? Was there some way you could tell?"
The elevator arrived with a final groan. Jace unlatched the gate and slid it open. The inside reminded Clary of a birdcage, all black metal and decorative bits of gilt. "I guessed," he said, latching the door behind them. "It seemed like the most likely explanation."
"You guessed? You must have been pretty sure, considering you could have killed me."
He pressed a button in the wall, and the elevator lurched into action with a vibrating groan that she felt all through the bones in her feet. "I was ninety percent sure."
"I see," Clary said.
There must have been something in her voice, because he turned to look at her. Her hand cracked across his face, a slap that rocked him back on his heels. He put a hand to his cheek, more in surprise than pain. "What the hell was that for?"
The other ten percent," she said, and they rode the rest of the way down to the street in silence."