The Hero Turned into a Succubus [Western Fantasy]

After transmigrating, Jiuyan discovered that he had become the powerful, righteous hero from a book, the one who saved the world. Who wouldn't like someone so selfless and responsible? But the problem was, this was an adult-market novel that didn't need logic or morality. The sun-loving flower died before dawn. The untouchable flower was stained with mud and fell from its pedestal. Under the combined effects of drugs and magic, he became a toy for the male lead to show off. He went from a noble, holy knight to a low-level succubus, unable to maintain his sense of self and driven by instinct. Knowing the future, Jiuyan was furious. Even if reality didn't need to make sense, he was still going to chop that bastard male lead to pieces! Then Jiuyan realized that the time when his body had been drugged seemed to be much earlier than in the book. His body had already begun to suffer side effects. Familiar faces from many races, including elves, fish-people, demons, and centaurs, all looked at him with concern. Jiuyan felt a shiver run down his spine under their gazes and took a step back. What do I do, Hero Bro? I think I've unknowingly piled a bunch of weird burdens onto you. Should I go rescue the original owner first? As Jiuyan considered it, he stole a glance at the hero he'd switched places with... Wait! Bro, why did you just kill the Main God with that huge sword on your shoulder? You've directly broken the infinite world! How am I supposed to get back? The gentle hero gazed at him with blue eyes and held out a hand. "You're free." ○ The seme is a holy knight hero, a succubus seme. ○ My take on Western fantasy. The hero has traveled to another world before, so everyone makes very Chinese-style jokes. ■ If you're bothered by deviations from the original plot, don't read the alternate-ending extras. The holy knight was drugged, and there's a plot where someone is rescued from prostitution, with non-consensual elements. The setting is very free-form, and most adult characters have had several relationships. Theme: Follow the light, even when it only glimmers.