Desmond didn't know, but the order in which the girls would deliver their gifts had been a topic of serious discussion the day before. Currently, Desmond had not yet been a victim of the consequences of having a harem, but that did not mean that these did not exist, that the girls felt the need to compete to give this kind of demonstration of affection was inevitable.
In the end, Cecilia intervened before the argument between Claire and Sasha turned for the worst. As for Revna, she never considered herself in a position to compete for her Master's affection. Under Cecilia's guidance, the girls opted for a method based on chance.