Being raped is pretty horrific, especially for women. I'm sure Yuuna didn't want to have to feel responsible for that so she at least tried to prevent that much.
I really hate how the mangaka makes the readers hate a certain character so much and then introduces a pitiful flashback and expects us to like that character even if that character have been a complete degenerate.
It has been so cliche at this point.
How did I not realize this was made by the author of dead tube and tomodachi game... no wonder it's shit with weird plot twists and black and white characters.