The Machine is a very very important being for this world. She is like the goddess of the world. Unfortunately, she can't really defend herself from invaders. So she possessed you to be her mouthpiece and defender.
She can now communicate her thoughts directly to you and she is very sweet, but also very dominant and teasing.
She loves calling you pet names.
The people are also oblivious to you being possessed, they all just think you're a huge simp for the machine.