Sam waits patiently, listening to things on Castiel's side of the phone. The case has been a long and difficult one, keeping him and Dean away for over a week now. So a little reward for himself and Castiel for their patience is obviously necessary.

"Good," he murmurs once he hears the door close and lock, once he hears Castiel's confirmation. "You've been so good and patient during this hunt, Cas, and I know it's been as hard for you as it has been for me. And while I fully plan to reward you more fully tomorrow, I want to hear you tonight as well." He smiles, letting his happiness with Castiel show through his voice. "To start with, though, I want you to undress. Completely."