The demon scam

You really don't want to give the demon your name, nor do you want to argue, so you feel leaving is the best option. Besides, you need to check on Merle. "I'm sorry, I have to go," you say, and start heading back to where Merle is hiding.

The cat-demon snorts after you, but doesn't try to stop you from leaving.

After a while, you glance back, but there is no sign of her anymore.

(What letter do you have?)