Sherlock must find out who John has his secret crush on. Johnlock

Post Into Darkness. Alternating POV between Kirk and Spock. Spock and Kirk always risk their lives and often the lives of the whole crew to save each other. Spock comes to terms with his feelings for Kirk after Uhura has enough and breaks up with him. It is all very awkward for Spock because it's a topic that is very new to him. He tries flirting but Kirk is oblivious.