I’ll Become the Mother of the Hero

“You may be my wife but, I won’t lay a single finger on you.”
“Really? Then can I touch you?”
“….What?”
About 20 years in the future, the world is 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..
“Are we going to continue not doing anything?”
I wanted to get it quickly out of the way, but my husband’s impregnable fortress is stronger than I could have imagined!
“Take it off! Why aren’t you taking it off?! Are you leather?”
Will Elena be able to safely birth the hero and save the world?