Dante closed his eyes and focused on his demon. When he opened them he only saw darkness and a smokey shadow with red eyes in front of him.
"I guess you're here to negotiate?" the demon said smiling, His voice scratchy but deep and loud. Dante hated the demon's red eyes. "Yes what is it you want?" he asked the demon. The demon smiled and responded. "I want what you want to make people suffer." 
"I don't want to make anyone suffer." Dante responded. The demon laughed and said "So you don't want to make people suffer for their crimes? Weren't you just suggesting you use your powers on criminals?"
"I think people need to be stopped, but i don't think they need to suffer. They have to live with their sins and eventually they pay for their crimes. Even after death. It isn't my place to give them the punishment" Dante responded. The demon chucked at the response. "But as you heard you are an immortal now. You are a part of me and in hell I was the one that carried out punishments. Tearing someone's soul apart is more fun than you think." 
"Well Dorothy you're not in Kansas anymore, so-" 
"Don't get fresh with me boy. You like that pain i gave you before? you think I tear at your body?" The demon laughed. "I tear at your soul. You see there is no pain like a wounded soul. I need your body healthy but I don't need you worthless soul. Another interesting thing about souls is that they heal faster than the body so I can cause you unimaginable pain over and over... and over." The demon said smiling. 
"And I could kill myself ending your fun." Dante threatened. The demon stopped smiling. "Now here is my offer. You can give me control over my body and the pain inflicted onto others. In return you get to live a long life and every week we can go to town and if there is someone in trouble you get to release some pain on the person causing the trouble. Otherwise once a week you can inflict pain on me." Dante said looking fearlessly at the demon. 
"And if I refuse" the demon said angry. 
"Then I kill myself now and we end this debate." Dante threatened with a smile.
"Fine. We have an accord." The demon said holding out his hand to shake on the deal. Dante took his hand and smoke wrapped around his arm. It burned and Dante cringed. The demon laughed as Dante screamed in agony. "We are one now." The demon said from inside Dante's mind. "When you inflict pain on someone this burn on your arm will glow and you will have to endure the burning as you punish someone else." The demon laughed.
"That wasn't the deal." Dante said.
"No, But that is the price of pain." The demon responded.
The darkness faded and Dante was sitting with the others in the great room again. He looked at his arm and there was no burn. He could hear the faint laugh of the demon.
"I did it." Dante said. "I can control the power of pain."