There is no killing in this world. So Vivian knew that nothing bad could happen. And sex is normalized because of the spell that was casted on this world
There is killing, that's why a spell was cast.
And there are multiple times in the game already where people get hurt and injured from "accidents"
So yes there is still killing, and yes I am aware sex is normalized based on the story and the spell.
So why then does the choice to talk about Kotone and her tricks occur but nothing to report another actual threat to people's lives like a damn succubus that tries to eat souls, even if it is on accident?