"Quick Penetration: Darkening Boss, Please Calm Down". I recommend this book to you. It's a sci-fi space-time travel novel. The main character, Mao Xiaoxiao, accidentally activated the contract system to attack the Dark Boss. After conquering it, he realized that the target had turned dark, so he had to start over again. The novel had sweet pet 1v1 and scumbag abuse strategy elements, which was very suitable for readers who pursued multiple experiences. I hope you like my recommendation, Mwah ~😗