I can imagine someone playing a "reject Rae" path. Without Rae's help and affection, the MC is trapped in the house alone except for a hostile, rejected succubus in the attic. He eventually dies of boredom.
Simple way to play reject rae path: delete the game.True.
In such a case, AngryRejectedRae may want test that hypothesis.
Just the idea that you're trapped with a pretty succubus who is friendly and helpful....then you want to reject her and potentially get her angry.
Rae would force MC into the training. Fists still work even magic does not.
According to what we know, if MC dies, then the house would probably collapse, and Rae would be trapped in the middle of nothing, so probably Rae would do her best to keep MC alive.