Some decisions are poorly made (mobile)

"You want to know what I look like?  What a curious request."  He waited quietly while staring at a blank canvas.  The question of what the demons looked like often bothered him.  The text often studied suggested mostly humanized features, though his time with her led to other conclusions.  Out of habit humans will often instill humanity to the unknown, the unfamiliar just to cope and rationalize.  She chimed in during the thoughts, her understanding of how he thinks and reacts becomming easier to translate as the time of their unfortate union.

"Very well, but to properly convey the appearance I will need to... borrow your vessel for a while."  Without hesitation he agreed, this was a rare opportunity where she was neither condescending or sarcastic towards him but instead humored him.

First, a deep breath to clear the mind.  Second, focus on the ether that binds the spirit realm to ours.  Third, wait for the body to release and separate the soul.  Fourth...  "Mhm, it is nice to have a body again even for a while."  While his lips moved, it was not by his will but now the demon's.  "This will take but a evenings time, refrain from thinking too much."  It took many months of meditation and training to allow the two to flip places even for a while.