He's her worst nightmare. She's his dirtiest wet dream.
Meet Jax.
"I just made a bet that might land me a brand new ride and the sexiest, most infuriating girl I've ever met. What's the catch? The main prize is my stepsister."

Meet Rubi.
"My filthy mouth has met its match. The only thing I like less than stepbrother dearest? The way he makes me feel like ripping my clothes off and letting him have me - any way he wants."

They have no idea what's about to happen, but by the end of the summer, their worlds will be torn apart. Being stepsiblings is about to become the least of their problems.