Not trying to restart the game to get the exact words, but Cedric (You) is sent to earth with a talisman that will react with some unknown princess that can overthrow Phobos or something. It responds to Elyon. Your mission is to corrupt her so Phobos wins. Going through the other WITCH's is to make you able to corrupt her. Once you've fucked her that's her corrupted, and your mission done. After that it's whether the author says yes that's over or makes up some plot about overthrowing Phobos but it could end that chapter with a pat on the back.
Specifically, you can poison them via your cum to disrupt their magic powers. making them weaker, so that Phobos could kill them. Phobos also tells you that Elyon is the rightful ruler and that Phobos stole her throne. (I have no idea if this is true or not in canon, its what the game said last time I played the start of it). And Phobos says they are stronger than him, but luckily lack the ability to properly reach him, otherwise he would be crushed.
So here you are seducing her, and for some reason MC never considers that instead of depowering them to be killed... he should just help them kill phobos (as easy as just escorting them to the palace), and become the King with Elyon as his queen and the other girls as his concubines.
