A is a demon who has been looking for a human host to possess, and thought they had found the perfect one when they saw a human in the hospital on their deathbed. They possessed the human and took control of their body at the same moment that they died, so they could be the only one in the body. B, the human's spouse, was overjoyed that their love seemed to be back and having seemingly survived certain death. Their spouse was suddenly perfectly healthy, but B quickly noticed something off about them.