When humans make deals with demons, it doesn't usually end well for the human. Unless they've made a side deal with an even more powerful demon.
This story is a collaboration between Valkyrie and Aditus as a response to the following prompt:
A month after signing the deal the demon shows up on your doorstep in the middle of the night. "What do you want?" You demand. "Look the deal is null and void," he began. "The hell it is," you scream at him. What deal did you make and why is the demon trying to cancel the deal?