I’ve never watched Twilight or saw any of the movies but those things seem like something I’d find in Twilight.
Sure, why not, Twilight did quite a few things right ( for my taste ) when it comes to romance.
I don’t understand giving up your own morality to satisfy your need for a romance.
It's the same direction of need for companionship, you just substitute one for the other.
As I said, I understand from an evil role play perspective but not when I am trying to play a decent or good character.
It is a romance for evil characters, yes, since without metagaming you will never see it to begin with if you are playing a good character.