The Naughty Step by Nikky Kaye

I didn’t bargain on a roommate, especially not my alluring, naïve little stepsister. She wants to get to know me better, but what she’ll discover could send her screaming in the other direction—or screaming underneath me.

Summer in New York is hot enough without her panties melting, too. I warned her that curiosity killed the cat, but then she reminded me of the rest of that saying—satisfaction brought it back.
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The Naughty Step is a hot standalone romance novelette in a loosely interconnected series. It includes adult language and situations. No billionaires or books were harmed in its creation.