The last thing you'd always do before sleeping was reading mangas/novels. On your 19th birthday your bestfriend bought you a 18+ book about a normal guy getting reincarnated,and he has to marry the Emperor and become his concubine. The next day you realized, you're not in your apartman anymore,but inside the book,and that you're not a woman anymore,but you're in the body of the Emperor and the mc is sleeping next to you. "Good Morning, your majesty"-said Kenzo with a shy smile