Clary couldn’t think of a thing to say. Why hadn’t it occurred to her that this might happen? Why hadn’t she said they should go to Jace’s room? The answer was as simple as it was awful: She had forgotten about Simon completely.
"I’m sorry," she said, not sure who she was even speaking to. 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."