Feel free to ignore this if you get what's going on! I'm writing this because I'm abit slow so it took me a good min to understand what's going on. This is for others weren't not sure what's going on.
Princess Yeldryia is the red hair girl, the one our protagonist is possessing right now. The game screen you saw where it was like the "prince confess his love to you", the you is referring to the game heroine/hero (we never know, could be a dude, but there's no yaoi tag so I doubt it), not our red hair protagonist. So the prince/dark hair dude who stepped outside must had met the game heroine and the game was continuing from there (you could see the mouse courser picking options). Meanwhile, our protagonist is still in bed with the blonde dude, and the game was not dictating her actions but the actions of the game heroine. I guess error/bug occurred because the OG villianess, Princess Yeldryia, was replaced with our protagonist who possessed her body currently.
Thanks for the chapter \(^u^)/