My Harem Consists Entirely of Female Demon Villains

I, the earthling "hero" of this story, crossed over into another world based on a video game and suddenly appeared in a villainous female demon's bed when I arrived. If not for the fact that I had married all the villains in the game before crossing over, I'd have been killed pretty quickly. Now, the villains keep pestering me, asking me to help them rule the world, and vying for my hand in marriage. What am I supposed to do? I'll await your answers online! It's urgent!

Original Webtoon

Adapted from the novel After Being Proposed To By The Villain.

A human being from another world, crossed over as a hero... into the bed of the female demon villain?! If I hadn’t established marriage contracts with all the villains in the game before crossing over into its word, I’d be a dead man. Now the villains are pestering me, making me assist them in dominating the world, contending for my hand in marriage, what should I do?! Stuck in the game... emergency!!!