待我称帝便封你为后
[dài wŏ chēng dì biàn fēng nĭ wéi hòu]
This means 'When I become emperor, I will appoint you as empress,' expressing ambition and a deep, even imperial-level affection toward another person. In Chinese culture, it's often linked with historical dramas where emperors marry and appoint their wives as empresses.