Demon Fusion?

Date: 5/22/2017

I had a dream last night where I had gotten "One time recruited" by a "Bad Guy" in the form of a demon. Meaning he lived inside my body, and he changed it so he'd be more comfortable. And I told him, "Only make changes that won't impact either of us." And the "One time recruiting" thing in the dream meant it was one way and he stayed for my now extended life of hundreds of years. And the only drawback to him being inside me was that his soul fused together with mine, and removing one of us would kill the other. So they left him in me because they didn't want me to die.