Reborn to Take the Master by Storm [Quick Transmigration]

[New Top: Bottom novel, "Giving You All My Love [Quick Transmigration]," is now live! The upcoming novel "I Treat You Like a Proper Cat, But You..." is open for follows!] System: [Clap, clap, clap! Welcome, player [Gu Changbai], to the Slave's Rise to Power game. Mission objective: As a slave, win over seven Demon King masters and collect 100% of each of their affection~ Mission reward: One converted Great Demon King. From now on, when there's work, your master does it; when there's nothing to do, you do your master~ Now, your choices are: A. Happily start the game right away -> Click Chapter 15 B. Read the beginner's guide carefully first ↓] ※ Beginner's Guide: ※ A top: bottom sweet romance! Also known as: "The Demon King's Personal Slave" (/ω╲) "The Slave's Thoughtful Demon King" ⊙▽⊙? The first world went off the rails, so please start reading from the second world _(:з"∠)_ Theme: Kindness is rewarded in the end, while malice brings retribution.