Kirk didn't know what was going on. He never felt uneasy before sex. Sex was natural, it was fun. But when Uhura leaned back into Spock's arms on the bed and ordered him to strip, a wave of anxiety coursed through him.

Spock's eyes were steady on his body as Kirk undressed. Clinical, almost. Emotionally detached. Of course Spock never showed that much emotion anyway, but this felt different.

Uhura ran her fingertips down Spock's arm and watched him. At least there was something he could decipher in her eyes – interest, curiosity, desire.

“We're going to have so much fun with you, Captain,” Uhura said, and Spock nodded.

Kirk swallowed hard. “Am I allowed to have fun in this scenario as well?” he asked, trying for levity and failing.

“You'll enjoy every minute of it,” Uhura promised.