He only had himself to blame in the end, and there was a plan he hadn't even shared with his two playmates. That was to arrange for a few individuals of status to be lured there and incidentally be caught in flagrante. It would leave Qinghe unable to voice her suffering and become a joke in high society, kneeling and begging him to marry her.
Aaron's mother was not of aristocratic birth; she merely had some enchanting techniques that tied down his Czech father. So, do not expect Aaron to be too bright. Focused solely on his own revenge, he thought too superficially, without considering the implications. If anything happened to Qinghe at an Austin Family banquet, would his family be able to escape the consequences? It would instantly escalate to diplomatic tensions between two countries, obliging the Austin Family to pay a price in order to give Qinghe's nation an explanation.