My Husband's Doting Love Just Won't Stop Despite Our Supposed Substitute Marriage

I married a man in a vegetative state. He's an only child of a wealthy family. His mother claimed that even if his body was left in this state, he could still give them grandchildren. If I could successfully conceive and give birth, she would give me one million for each child. I got motivated by this reward and decided to aim for three million... But things didn't go as planned.