They separated again at dinner, as Draco had a detention to attend, and Ron had asked him to fit in an extra quidditch training session before they went to their Astronomy lesson that evening. The Slytherin and Ravenclaw session for Astronomy was directly after the Gryffindor and Hufflepuff class, and so they saw one another for the last time (or first time depending on how you looked at it, as it was after midnight) that day as they passed one another on the way up and down the Astronomy tower. They exchanged smiles, and a quick hello, and Harry realised for the first time, that he had started measuring the day in when he had last seen Draco, and when he would see him next.