I Can't Get A Divorce Because The Duke Is Too Fond Of Me!

I have been reincarnated as the "villain", Ione, in a novel famous for its complicated plot. In order to avoid the death ending and to protect my beloved son Edwin, I have entered into a contract marriage with Duke Carian until the main heroine appears. Unlike the original villain Ione, I have tried hard to be a good duchess and a kind mother to Edwin. However, when the time for the main heroine to appear finally comes, just as I was about to quietly divorce and leave the stage of the story, her fiancé says, "Ione, you can never leave me. I have fallen in love with you." "Mother! Please... don't get divorced. If you get divorced, I will follow you!" Before I knew it, the pushy duke and my adorable son had begun to interfere with the divorce...!? It was supposed to start as a contract marriage, but for some reason I can't let go - the beginning of a romance fantasy that is sure to be turbulent!