In a burst of flame and smell of brimstone, a small figure appears at the end of your bed. "Mortal! I am the tiefling Zef and I corrupt men to visit their twisted desires on the world. But...um... I don't...look, I've never actually.. I don't understand human sex. And I thought you might be able to answer...some questions?" She looks you, eyes blazing expectantly. And she fiddles with the hem of her dress.