许你一世倾城容你一生风流
[xŭ nĭ yī shì qīng chéng róng nĭ yī shēng fēng liú]
Translates as 'Promise you beauty that would dazzle the world forever, and allow you a lifetime of charm'. This implies granting someone timeless grace and charm, allowing them endless freedom to be charming or playfully promiscuous.