Deal with the Incubus

"Do you really want to do that?" he spoke making the space between us even smaller.

"I don't know you! get away!"
he didn't listen instead he pulled me closer to him , nibbling on my ear.

"If you sign, I'll retrieve you sister from lillith. if you don't, she dies"

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what happens when Esmé and her sister stumble into a supernatural night club to celebrate her birthday. They meet people who aren't all that good.
To save her sister from an Incubus King she has to sign a contract; but not any contract, one that will give an incubus her soul to do what ever he desires with her body.
The only problem, he's a sex demon , and she happens to be a virgin.