"Then why would you...." Derek made a frustrated sound and rubbed his neck. He took a deep breath to calm himself, because if Stiles thought he could keep things distant, he was so utterly wrong. There could be no distance between a Master and their personal slave. Not for Derek, anyway.
"Fine," he said, finally. He would allow Stiles his delusion. For the moment.
"Pick out something you want to play with tonight," he continued, his tone just as casual as before. "...and something you want me to use on you."