I’Ll Become The Mother Of The Hero

About 20 years in future, the world will be in ruins because of the invasion of the beasts. There's only one way to stop the destruction. To marry the duke who is called a monster, and have his child who will become the hero in the future! Elena who saw a glimpse of the future succeeded in marrying him but... "You may be my wife but, I won't lay a single finger on you." I wanted to get it quickly out of the way, but my husband's impregnable fortress is stronger than I could have imagined! Will Elena be able to safely give birth to the hero and save the world?