Alison

“Isabelle drifted over, Jace a pace behind her. She was wearing a long black dress with boots and an even longer cutaway coat of soft green velvet, the color of moss. "I can't believe you did it!" she exclaimed. "How did you get Magnus to let Jace leave?"
"Traded him for Alec," Clary said.
Isabelle looked mildly alarmed. "Not permanently?"
"No," said Jace. "Just for a few hours. Unless I don't come back," he added thoughtfully. "In which case, maybe he does get to keep Alec. Think of it as a lease with an option to buy."
Isabelle looked dubious. "Mom and Dad won't be pleased if they find out."
"That you freed a possible criminal by trading away your brother to a warlock who looks like a gay Sonic the Hedgehog and dresses like the Child Catcher from Chitty Chitty Bang Bang?" Simon inquired. "No, probably not.”
― Cassandra Clare, City of Ashes