"You deceived me," Spock said to Kirk as they both sat in sickbay, recovering on their way to Babel. "If I had known that you were not well, I would not have completed the procedure."
"Frankly, Spock, you should be thanking me. If it wasn't for that, your father might not have made it." They both glanced over at Sarek, sleeping in his bed.
Spock nodded. He thought of the time he had deceived the captain to deliver Christopher Pike to the Talosians. Perhaps he could consider them, as humans would say, "even."
"What's on your mind?" Kirk asked.
"Duty," Spock said without hesitation. "But I stand by what I said before. Sarek would have been deeply ashamed of me should I have shirked my first duty to the Enterprise to attend to him."
"Spock is right," Sarek said, opening his eyes and sitting up. "He made the logical choice, and I do have to thank you for your efforts to save my life, Captain Kirk."
"Not a problem," Kirk said. "As the captain of this vessel, it is my obligation to care for any guests aboard. You could even say it's my duty," he added, winking at Spock.
Spock resisted the urge to roll his eyes.