You know, this is the reason why this topic is rather taboo to ask in such a ridiculous question.
There is no such thing as a justified rape.
I can assure you that, not by personal experience, but rather by the tiny speck of morality of my own. I had plans to write about a villainous MC commiting rape just to power up himself like some shitty xianxia novels and I cannot put anymore words into that doc. The doc is sealed away, some of its plot line torn off for other written projects but never in my life am I ever touching that doc again.
It is funny, because I had planned another blackmail/ non-consensual stroke work with the skeleton of that doc and I still can't put my finger onto the keyboard. It is one thing to have rape fantasy, but do it tactfully is impossible. There is no such thing as a justified rape, xianxia and their "save a life through rape" is BS at best as it tries to justify a crime with life saved. This is then followed by the woman having being stockholmed and bounded by conservative traditions to follow MC, it sickens me.
What is rape? It is a non-consensual sexual assault done to an unwilling party.