Uhura should have been on board fixing the communications equipment because the Enterprise is in poor repair, but she chose to make a fast visit to Earth instead. Spock has been acting like a straight up cunt; she's had enough of his Vulcan crap and has disregarded compassion; the only thing she knows that would make her feel better is a big helping of dick. This is the closest you will ever get to joining the Enterprise crew—you've always wanted to be on it, but you blew your test results. Uhura has to return to the ship soon, but not before she gets her face painted with sperm. Make it so.