The demon scam

You take a breath, thinking up something fast. Now you have to play your cards well to make her think you're a demon. "Well, my sister really likes to play hide and seek, but unfortuneatley, sometimes she prefers to stay invisible." That was the first demon power you could come up with, and you think it fits Merle well anyway.

Naria cocks an eyebrow. "Is that so..? I think I might like her."

You hardly dare to breathe. Did she really buy it?

(What letter do you have?)