I think there is a problem with the tag "Rape" firstly because it includes [Forced or non-consensual sex.] and also because it's a kink for some and turn-off for others.
But as long as there's only one tag, it should be applied for both.
I was under the impression that she badly wants to bang us (the MC) but she is worried that we'll die because of whatever curse/demon power she has, but I could be completely wrong about her reasoning.
Yes, the story makes us believe that she wants to fuck MC. But it's still her decision WHEN they'll be fucking. Not today, means not today.
I wouldn't call that rape, and she definitely didn't say "Get it out of me, how dare you!"
Her words were "Red? What are you-" which was not a YES.
But it doesn't matter what she said after he penetrated her because consent must be given before the act not afterwards.
This scene is a good representation of the most common sexual assault worldwide:
Man and woman go an a date.
She tells him "no sex today".
They start petting and the man convices the woman to undress.
She again tells him that she doesn't want to be penetrated.
He gets in a position where he has easy access.
He sticks his dick into her.
She protests shortly but then gets silent because he has already proven that he's ignoring her.
She goes into survival mode to get it over quickly.
He ejaculates and is happy.
She is wondering if she did something wrong.
He doesn't even notice the sexual assault.
That said, the MC being demonic and having features like mind reading, possessing people, dream invasion and addictive sperm, I'm sure there will be more non-consensual sex.