A deal with the Devil. (слэш)

“I can let you be by my side, Dice, but to become my right hand, to be my dearest alive being at my side, we need to make something…” Devil whispered with his low voice, trying to seduce Dice, and he did it.
“Tell me, tell me and I’ll do anything for you” Dice said, smiling with hope, he took Devil’s beast hands and looked at him at the eyes. Devil smiled. And, whispering again, he said:
“We need to make a contract. I need you to give me the most beloved, desired, and dearest thing in the world that you have… Your soul.”
(Basically my headcanon of how Dice became Devil's right hand -and boyfriend-).