I think that Spock is sulking :) Uhura just wants to reach the stars.
How many stars have to shine
Before your eyes meet mine?
How many stars must I see
Before you dream like me?
And as a bonus, fanart inspired by Four Consequences of the Unexpected and Unlikely Friendship Between James T. Kirk and Nyota Uhura by trisfic. It's mostly a "Uhura and Kirk become bros" fic but I LOVE IT. And it has some very sweet S/U part (And Kirk/Bones).