DxD: The fake X fate - Chapter 17 -: Rias exclaimed

He, since childhood, had followed the Foreigner to practice the Defying Heaven Art, entering the most secretive special forces and becoming a fearsome assassin that made others tremble at the mere mention of his name. After a single failure, he took early retirement, but he ended up as the personal bodyguard for a rich heiress, a school beauty. Accidentally provoking some mysterious Cultivators, he gradually unveiled a hidden world of Cultivation beyond the mortal realm...

Original name: Prince Charming's Next Door, finished. One day, she slept with him accidentally. Two month later, she found herself pregnant, so they got married with baby. “Mr. Gu, I like the dishes of this restaurant.” Then the chef of that restaurant was hired as theirs. “Mr. Gu, I like the bags of that brand.” Then the designer of that brand was employed exclusively for her. She thought of herself as a stranger to him after marriage as she had always been, but in fact he doted on her totally beyond her imagination. He would satisfy all her demands, except letting her find a job. She kind of got anxiously bored at home, so she sneaked out to find herself a job. However, whichever company she was hired by would go bankrupt somehow or other. Finally, she got to know it had been always him who had done mischief surreptitiously. She went to question him angrily, but he gave her a job with a smirky smile. The next day when she went to take the office with delight, she found her employee ID card on the desk said ‘Name: Qin Zhi’ai, Position: Wife of Gu Yusheng’.

William Scott, a soldier, returned to the city with the goal to live the rest of his life peacefully. He would practice the lifestyle of a retired person.

However, his mother set him up on blind dates time and again. Unwilling to keep up with her arrangements, he was left with no choice but to pretend to be in a relationship with Yvette Quinn, a female CEO who was also forced by her parents to go on blind dates.

To his surprise, this was only the beginning of many troubles to come. Before he could get to settling those troubles, he first needed to sort out an even more pressing problem.

The girl looked at him and asked, “Take a guess. Am I the elder cousin or the younger cousin? As my boyfriend, you should be able to differentiate between the two of us, right?”

His contract girlfriend was so unprofessional. Although they had an agreement, she was always asking her younger cousin to take her place and pretend to be her around him.

What should he do about that?

Transmigrating into a poor and mistreated young lady's body, what will the craziest alchemist of the seven realms now do?