It's Derek bursting through the door that has Dean's heartrate kicking up, the man himself not unwelcome, but certainly a variable Dean hadn't planned for, and these days Dean lives or dies by his plans. But those fangs and claws can be put to good use here, and Dean cocks his head in welcome.

"My idea of a productive one," he replies, using the distraction to slide his blade through the throat of the vampire nearest him. "Don't get any blood in your mouth."