I Became the Biological Mother of the Villainess

I died unexpectedly and became bound to the System. To stay alive, I had to redeem the villainess. But unfortunately, the story had already reached its finale. The villainess had long since received the ending and fate she deserved. To help me complete the mission more effectively, the System suggested that I become her lover from among the many available roles. I shook my head and chose the gray button. It had four words on it: [So, I'm her mom.]