Although it was a bit disconcerting that Xiauyue would act like she was their long-time friend, Claire and the rest didn't find it too strange or awkward. It seemed that Xiauyue was very fond of Desmond, and since she had heard so much about Claire and Sasha, she simply spread her feelings for Desmond to them.
Curiously, Claire and Revna, the most possessive girls in the group, showed no reaction to Xiauyue's clear affection for Desmond. This was because Xiauyue spoke of Desmond as a family member rather than a friend or lover.