" Then forget Gabriel. Is there a particular reason you keep biting vampires?”
Will touched the dried blood on his wrists and smiled. “They don’t expect it.”
“Of course they don’t. They know what happens when one of us consumes vampire blood. They probably expect you to have more sense.”
“That expectation never seems to serve them very well, does it?”
“It hardly serves you, either. "

― Cassandra Clare , Clockwork Angel (The Infernal Devices, #1)