Unequal Exchange

There is a shop where you can trade anything: wealth, morality, anything you can think of can become your bargaining chip.

The shopkeeper is a demon, but always keeps his promises.

You might even see someone else in the shop. He might be an angel.

*

Uses the worlds of Good Omens and Sherlock. Apologies in advance for out-of-character portrayals. Many details are my own, and the timelines are a chaotic blend.

Theme: Enter at your own risk.