10 parts Complete MatureSienna knows the rules. You don't look at your best friend's boyfriend. You definitely don't sleep with her ex. But one blurry, liquor-soaked night at a party, all those rules went up in flames when she woke up next to Cade.
Cade was the other half of Reign's two-year relationship-a relationship that's been over for months. Sienna should be racked with guilt, ready to bury the mistake and pretend it never happened. But the problem is, the feelings she and Cade unearthed that night are too real, too electric, and they refuse to stay buried.
Sienna has always put Reign first. How can she tell her best friend that the secret, passionate connection she now shares with Cade is something she can't walk away from?
Cade, however, has no such reservations. He knows what he wants, and he's been wanting Sienna even when he was with Reign. He's ready to fight for her, even if it means destroying the one thing Sienna values most: her friendship.
Torn between the man who makes her heart race and the best friend who owns a piece of her soul, Sienna is caught in an impossible choice. How far is she willing to fall for a forbidden love, and can a relationship built on a betrayal ever truly survive?