Cyrus was rather tired, having stayed awake all night so as to prevent anybody from pranking his room. It was his understanding that pranks were meant to stop at noon, but he didn't fully trust anyone to keep to that, so his room was guarded by Gyarados and Weavile while he stepped out for a few moments.

Usually he avoided caffinated drinks aside from his tea, but he had a goal of a few more hours. And there was coffee in the common room.