After Being Revenged by the Pregnant Palace Maid, the Only Princess Went Crazy and Killed Her

My father only has one princess, and he has gone crazy trying to have a son. This time, he favored a beautiful and pregnant palace maid after drinking, and at the palace banquet, it was revealed in public that he was pregnant. The emperor was so surprised that he immediately ordered her to be concubine Shu. After ten months of pregnancy, she successfully gave birth to the little prince, but the little prince was secretly executed the next day. Another year later, she gave birth to a pair of twin princes, but the two princes still did not survive to the third day. Until the year I ascended the throne, she was forced by her father to become pregnant with her tenth child.