Divine Beasts Aren't Bottoms

Synopsis: Yuan Qi transmigrates into the novel he wrote and gets a System that does nothing but sabotage him. The System is always yelling at him to be a villain. Instead, Yuan Qi hooks up with a gorgeous, perverted eunuch. Every day, he fools the System and hunts for rare treasures to repair the eunuch's little brother. Then the eunuch stops being a eunuch and turns into a divine beast. But why isn't such a gorgeous guy the one getting topped? Theme: