Toaru Majutsu no Index: New Testament - Volume 14, Chapter 1: Imagine Breaker and World Rejecter — One_Night_Encount.

The Empress who dies in torture, An Rushuang is her name. After she wakes up, she finds herself has time-travelled to when she was twelve years old, but she would turn into Major General’s white horse at night. He is a general who orders about the winds and clouds on the battlefield, and she is a little girl lives in her boudoir seclusively.
She endeavors to change her fate, and he spared no effort to win every battle. They meet each other every day, well, it’s night to be accurate. Is that a dream or not? She pleads to marry the seignior to win peace for her family, only to find he is the one she is going to marry.
“Growing old with you under the same roof is my long-cherished wish”, thought them both.

- Description from Novelupdates

There’s a legendary Bishoujo Game that has become popular among Japanese gentlemen.

All I ever wanted was for famous detectives like Sherlock Holmes or Arsène Lupin to appear in my dreams and share their wisdom. But instead, why am I hearing the voices of notorious serial killers in my head, guiding me to solve a string of mysterious cases?

[WARNING: MATURE CONTENT, DARK THEMES]“I will tie you to the bedpost and fuck you like a dirty little slut. Our bodies will meet in perfumes and in sweat until you're screaming for mercy from me… your big bad fuckable lord and Alpha.” He vowed and my face seared with humiliation.Wasn't it laughable that I was not humiliated because of his words, but because of what the thoughts that lingered at the back of my mind were?I wanted every bit of it. The crazy wild sex, the toxic bond… somehow—the sound of them set my soul on fire. I wanted them all.____Phoebe Skywalker is a humble maid in the mansion of the Prestigious Blue Moon’s Alpha. When she is chosen as the Moon's Chosen who is destined to mate with the Alpha, no one expected this taboo as only elites were allowed to become the Luna.Unable to tolerate this humiliation, the arrogant Alpha rejects her. But the Alpha Council intervenes, forcing him to mate with the unlikely chosen one.Phoebe becomes the pack’s Luna but Alpha Kaene would never open his heart to her… or so he thought. When he tries his best to intimidate her, promising her unending nights of merciless lovemaking, Kaene doesn't expect the feisty side of Phoebe that he soon comes to discover.The taboo Luna shocks everyone as she not only shines in conquering enemies but also in stealing the heart of the stoic Alpha Kaene.