The Villain Boss's Professional Ethics [Quick Transmigration]

As the first world begins, the System, code-named Apple Cider Vinegar, grows increasingly convinced that something is off about this Host. Apple Cider Vinegar: [Host, you're a koi who cultivated good karma and transformed into a dragon, right?] He had clearly found the Host's soul and signed a contract with him before the koi transformed into a dragon. Ao Yu: [I did transform into a dragon by accumulating good karma. My original form is a golden snakehead... The pronunciation seems slightly different?] Apple Cider Vinegar trembles with fear. [Host, what kind of fish is this li of yours?] Ao Yu: [A snakehead. Most snakeheads are black, and are called black snakeheads or black fish. Because of their markings, they're also called money fish. I'm a rare variant, golden all over, called a golden snakehead.] Apple Cider Vinegar crashes, metaphorically spitting oil. A black snakehead... isn't that just a black fish? He was supposed to sign up a vegetarian little koi, but ended up with a meat-eating big black fish! Unbinding requires the agreement of both the Host and the System, or a serious violation of principles by the Host. All Apple Cider Vinegar can see is the word "Doomed" filling the screen. The bottom isn't split into copies; he grows over time. The reveal comes much later, so it won't appear in the blurb. Content warnings: 1. The top and bottom are both alphas, both powerful, and both adored by everyone. The bottom is a little naive at first. In the early worlds, he has memories, but they're very hazy. 2. There will be worlds with historical-style ABO settings (Kunze, Qianyuan, and Zhongyong), worlds with shuang'er, and more. The two leads are each other's only partners. No biological children, though they may adopt. 3. Apart from talking, the System has almost no functions. The top and bottom rely on their own abilities. 4. The title calls him a villain. The big black fish is ruthless and does whatever he pleases, but the ending aligns with moral values. Theme: Upright and courageous people can protect their happiness