I Guard Tianlao and Invest in the Demon Girl at the Beginning

[Invincible at the start + extremely cool] Chu Xiu traveled to the fantasy world and became the prison master of the Wild Prison. He never expected to be sucked dry by a demon girl on his first day at work, but as a time traveler, he unexpectedly awakened the system. Just invest in the villains in Prison to become stronger! So... Witch: Sir, I don't want it. I really can't suck it anymore! Demon Saint: Chu Xiu, you bastard... You... Didn't you eat... Madam of the Aristocratic Family: As long as you can save my son, I will do anything!