Toaru Majutsu no Index: New Testament - Volume 15, Afterword

Sequel of Allison, taking place about 17 years after the original series.

The unparalleled Demon King Ye Xuan, who was able to heal the death or the living alike and holder of the medicine Holy Scripture, was betrayed and killed by his fellow Demon Kings. But he reincarnated into the body of Ye Xuan, the prodigal son of the Ye family and vowed to himself that he would return to his peak and take back everything that belonged to him!

- Description from Novelupdates

A dark soul, damaged by his past An angel forced to be his mistress. Can anything go right? Would they ever be able to fall in love? Will she be able to see past his darkness? Will he be able to protect her when danger comes knocking? Find out in this book... An Excerpt*

''You know what you are getting into, right?'' He asked, crossing his legs, he raised a brow;

Tiana's lips slanted and her eyes narrowed at him;

''As long as you pay me, I'll do whatever you want. '' Nicklaus was amazed by her sudden audaciousness;

but he was sure she was just trying to seem bold, He knew her, she was just a weak, trembling soul, and she was trying so hard to mask it;

A smirk appeared on his lips as a thought came into his mind; ''Whatever I want? ''

He asked again and Tiana replied immediately without a second thought;

''Yes, Mr. Nicklaus, whatever you want. ''

''Alright then, I want you to strip yourself and go lie down on the bed. ''

He did not have any thought of touching her; he just wanted to see her reaction. But what Tiana did next shocked him.

Mu Mu transmigrated in the novel that had the plot like a fraud marriage with a man dressed in women’s clothing, rich man regretting and taking revenge after rebirth.

The body he had transmigrated into was none other than that of a scumbag who was a fraud man dressed in women’s clothing. He was also the one that the protagonist took revenge against.

And now, he was standing at the door of the Civil Affairs Bureau with that damn protagonist, holding the newly-released marriage certificate in his hand.

Mu Mu agitatedly raised his head. He saw the fierce and sinister expression on that damn protagonist. He was twitching the corners of his mouth, showing a grim smirk of wishing to eat his blood and flesh.

Mu Mu’s legs were weak and his eyes turned dark. He was trembling: “My good brother, why don’t we get a divorce?”

- Description from Novelupdates