"I'm always writing something," he explained, "It's just easier to bring the food to where I'm working." Perhaps it wasn't especially classy to tell the girl you liked about gross habits you had, but Spock felt that being open and honest about things was a good stance to have about a relationship.
He served himself, taking a medium sized portion and figuring he could go back for more in a bit. "Well, thank you for inviting me over." Spock liked that Uhura seemed to trust him. She'd even told him her first name, which was something he hadn't expected so soon. It meant, he guessed, that she really liked him. That was enough to make him pretty happy. "I'm honored."