" You're my sister," he said finally. "My sister, my blood, my family. I should want to protect you" - he laughed soundlessly and without any humor - "to protect you from the sort of boys who want to do with you exactly what I want to do."
Clary's breath caught. "You said you just wanted to be my brother from now on."
"I lied," he said. "

― Cassandra Clare , City of Glass (The Mortal Instruments, #3)