"Wonderful!" Lucifer removed his hands from the man's shoulders and snapped his fingers, causing a collar much like one a cat might wear to appear around the somewhat terrified-seeming human's neck. A bright green gem hung from the collar, glinting in the light briefly as the pale man clapped happily. "Now, don't let that break, it's important to your survival. And don't look so upset! It won't be that bad~. Well...I haven't had a bound assistant-slash-forced summon in a while, but I assure you that your soul is perfectly safe! Feel free to run along now; you'll know when I need you~." Turning back to the others, the pale man gave them a reassuring smile. 

"Oh, yes. Two more things." 
Suddenly, as if the thought had only just come to him, Lucifer turned back to the man he had just collared. "That doesn't really come off, you see. Sorry about that. Also, [i]you can't say anything about how you got this.[/i] Safety first and all~!" He waved cheerfully to the man as soon as he finished speaking, as if nothing had happened at all. 

"He was nice, wasn't he?"