Is this really a Game?! - Chapter 1055: Echoes of the Wicked: Dangerous Quest

"An accident. She's pregnant. How unlucky. She got pregnant in one shot!

They are childhood sweethearts, they are engaged under the family’s scheme, and they have to live in the same room and sleep together.

That night, she was accidentally drunk, and he kissed her in a fascinating mood,. By accident, his “crime” was finally discovered, she accused him, but he said with a smile, “You are my wife, why can’t I kiss you?”

The two people’s daily routine is full of bickering, mutual hate.

He said that he disliked her. Actually, In his heart, he was extremely caring of her. When she was close to other boys, he was so jealous that he wants to tie her to his side and become exclusively his.

[Congratulations! You’ve unlocked the Dimensional Motel System.][First Mission: A runaway princess—hailed as the most beautiful in the land is being hunted by her step-mother. She was originally headed to the dwarves’ cottage, but the System has rerouted her to your motel instead.][Protect her. Win her trust. And if you manage to woe her, you’ll earn her Affection Points.][Bonus Mission: Sleep with her evil stepmother to unlock more reward]'What kind of weird mission is this? And why does this story sound way too familiar?'

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates