It was one thing to lie and another to accuse but Lucien had done both. He didn't care what these ladies would do to Arabella and though as Adele's brother one would think that he had done this out of spite as Arabella's presence had caused his beloved younger sister some pain, his reason for not clearing who she was to the foreign lady wasn't anything as noble. The only reason why he had done this was because it was fun.
He still remembered a few days ago when his mother had warned him to not get an inch closer to Arabella. She had decided to warn them that though Arabella's presence around him was something that they couldn't come to terms with, outright trying to harm her was akin to ending their familial bond to Cassius. And Cassius who had rarely threw a tantrum was forgiven as he would soon become the king.