I Became the Master of a Harem in a Dark Novel

I woke up in the body of Ailexia, a supporting character with a harem, in a 19+ dark novel written by a friend. And it had to be in a bizarre situation where I was trampling on a man. The problem here is… The man being trampled on is the original male protagonist who kills Ailexia. I tried my best to avoid getting entangled with the male protagonist. – ‘Intertwine your bodies.’ I fainted at the sound of a strange voice, and when I woke up, I was lying in bed with the male protagonist. – ‘…You’ve had your fun, why don’t you go back?’ …It seems like something big has happened. *** I tried running away, pretending to be Ailexia, and diligently searched for a way to return. Perhaps because of my earnest efforts, I was finally able to return to my original body. But… “It doesn’t matter. It doesn’t matter anymore. So, don’t leave me alone in this abyss.” Even the original male protagonist who kills Ailexia. “From now on, embrace me. Not anyone else.” The duke who always looked at me with contempt. “If I can have you, I will do anything without hesitation.” The Grand Duke who always scolded me with an angry face, looked like something’s off. “Today, we will dine together. Stay by my side until everything is ready, Asha.” Even the Emperor, who was described as indifferent to Ailexia, is acting differently. *** I finally returned to my original body. Of course, I thought there would be no more problems… “I’m sorry.” “…” “I won’t miss you a second time.” The moment she saw him, filled with deep possessiveness and joyful satisfaction in his eyes, she instinctively knew something was wrong.