Your Majesty, the Crown Prince Is the Ninth Thousand-Year-Old's Son

The female lead is a local, while the supporting female characters include a transmigrator and someone with a quick-transmigration System.

Warnings: The male lead is purely a tool in the early chapters. The story mainly focuses on the female lead, and the male lead has little screen time. The female and male leads are both determined to cuckold the emperor. The female lead isn’t a good person, but she has principles and limits.

Both leads are virgins!! [Two powerful leads + satisfying revenge + undercover agent + transmigrating supporting female character with a System + male lead as a tool] The female lead has been strong since childhood.

She was the legitimate daughter of a general, but after Prince Qing, the eldest prince, framed her, the crown prince was deposed and her entire family was executed. Ten years later, after a carefully laid scheme, she was sent to the emperor’s bed and became the favored consort of the man who had destroyed her family. But no one knew that the one who shared her bed and brought her to ecstasy each time was the Nine-Thousand-Year-Old. I never believed in fate, yet every day I prayed before Buddha that you would love me.