Villain: The Protagonist's Sister? She's My Tool!

Gu Ke transmigrates into a fantasy power-trip novel as the villainous Holy Son. From the start, he is confronted by the protagonist's younger sister, who begs him to spare the chosen protagonist.

Fortunately, he activates the Myriad Worlds Invincible Villain System.

[Ding!]

[The protagonist has been detected changing the course of the world's story. The Myriad Worlds Invincible Villain System is now active!]

[A change in a key plot development has been detected. Host, please choose one of the following:]

[1. Become the ultimate bootlicker, apologize without thinking, obey every demand Yue Qian makes, and declare that Yue Feng is Yue Qian's fated one, offering to help set them up. Reward: Supreme Divine Art, the Green-Haired Bootlicker Art. Enjoy every moment of it, Host!]

[2. Stay the course and follow the original plot. In the end, the protagonist will utterly crush you, reduce your body to ash, and trap your soul in the Banner of Ten Thousand Souls, where you will never be reincarnated. Reward: You can slip out of the Banner of Ten Thousand Souls and give Yue Qian and her partner a push while they're cultivating together!]

[3. Claim Yue Qian for yourself and cultivate together! Reward: Northern Kun Divine Art, which can devour all living beings!]

Is there even a choice?

How could he become a bootlicker? Of course he'll claim the protagonist's younger sister!

Using the System, Gu Ke gradually changes his fate, becoming invincible across the myriad worlds and claiming all the protagonist's opportunities and love interests!

"That's right, I am the strongest villain under Heaven's mandate!"