Does the demon's soul occupy your body?

I felt like I was being tortured to death by the soul of a demon that had taken up most of my body and was about to torture the soul of my most instinctive person, and I killed the soul of a demon with the greatest strength! I don't want that nothing property! The so-called birth of a child is not lonely! I want to be a soulful person who feels that I have not lived in vain!