Her craving, Her brother

From the back cover

For six years, Lumi thought she had everything: a steady relationship with her devoted fiancé, Caius, and the promise of a perfect future. But the night before her engagement party, Lumi walks in on a betrayal she never imagined, Caius in the arms of her own cousin, Wren.

With her heart shattered, Lumi decides it's time to stop being the good girl. She creates a daring "sin list"-ten bold rules to break before the year ends. Rule #1: seduce a stranger. But when that stranger turns out to be none other than Caius' older brother, the dangerously alluring and untouchable Briggs, Lumi's game of revenge ignites a fire neither of them can control.

As each "sin" on her list pushes them closer, Lumi will have to decide if vengeance is worth the price, because loving him might be the most dangerous sin of all.