Choose one of three routes to start off the story:
Customers are... well, paying customers who come to Mallory's Unique diner for one reason or another. Usually humans, and tend to be switch-y.
Waitresses are the cute girls tending to Mallory's many, many tables and bedrooms(!), ensuring the happiness of customers. They tend to be on the prey side of things, and have a healthy mix of humans and demi-humans.
Hookers are the ladies who sex up certain paying customers, and have a tendency to slurp them into their bodies. Usually predators and usually demi-humans, what with animal instincts.
[CONTENT WARNINGS - Do not proceed any further if you adverse to any of the following kinks]