The 35-year-olds, who worked together on NBC’s comedy “The Office” as writers, producers and supporting cast members, say they just started working on the book project and it won’t be out for a while. On “The Office,” their characters had an on-again off-again dysfunctional relationship, and Kaling has publicly said the two have also dated in real life. Kaling is also the executive producer and star of “The Mindy Project,” a comedy that was just canceled by Fox after three seasons but picked up by Hulu for 26 episodes. “I’m so excited,” said Kaling, adding that the writer’s room for that show resumes work on Monday. BookCon, a two-day, literary version of Comic-Con, is designed to drum up excitement from fans about books and reading. Other famous authors taking part include young-adult authors John Green and Judy Blume.