Now that Aiden's brain was basically gone and replaced by an empty one, Mark went ahead and changed it to be sexyer. Younger. His slave was now 18 years old and hairless. A total twink who could easily be mistaken for 16 or younger. Total obedience. Not a question or hesitation in his lack of a mind.
The mindless slave would be an expert at giving blowjobs and wouldn't need to pause for rest or breath or gaging even while deep throating.
His ass would be perminantly tight as a vergin and self lubricating. Aiden would moan with pleasure even though it didn't feel anything. It would cry out in pain when punished even though there was no one inside that body.
Lastly came Mark's evil idea. He went ahead and resurrected Aiden as an incorporial ghost that only he could see or hear. The ghost Aiden would feel and taste everything his former body experienced, but he'd have no control over it. Also, the ghost version would look as cute as the flesh version. And it could not get too far from his body.
Aiden opened his eyes, disoriented. He was surprised he was still alive. He felt naked and looked at his hands. They were translucent. He was floating in the middle of the room next to Mark and what looked like a younger version of himself.
"Welcome back, Aiden. You didn't think I'd really kill you, did you? What would be the fun in that? Slave, give me a blowjob. Not a fast one. Build me up for a while and savor my cock with varied techniques." Instantly the twink got to his knees and started undoing Mark's pants.
"Hey! That's my body! You can't..." Aiden was silenced mid rant by the feeling of a cock filling his mouth. His flesh body was already going passionately to town on Mark's cock.