"So did you's do missions together? What about Bucky?"
Eggsy could listen to stuff like this all day long, and had spent ages annoying Merlin and Harry with questions about their past missions. Harry had been more than happy to tell him, especially during the night before everything went to shit, while Merlin had only really been forthcoming if it had been relevant to their training ("Why had this part of the mission failed?" or "What would you have done differently?" or whatever). Eggsy had aced all his answers and just come back with more questions.