Tied: Book One, The Reign Series:

The moment Reagan Langley signed her divorce papers, she felt a wave of relief followed by a sickening realization. Her marriage didn't fulfill any of her needs. In celebration of her new relationships status, Reagan is gifted a salacious romance novel. The more spicy sex scenes she enjoys the deeper her curiosity grows. The impulse to understand her new cravings leads her to Reign, a local sex club, and into the capable hands of Caleb Dunn. Their chemistry is instantaneous, but so is Caleb's hesitation to guide Reagan as she explores her sensual appetites. Determined to learn more about herself, Reagan agrees to Caleb's strict limits as they uncover Reagan's secret desires. But with each tantalizing liaison, the boundaries of their arrangement blur. When their hidden pasts threaten their deepening ties, Caleb and Reagan must decide if their future is worth breaking the rules to salvage their bond.