Salt and Sweet by Juno Rose North

At 32, Emmy’s world has just collapsed. Her husband’s betrayal has left her alone for the first time in her adult life – but she’s determined to turn heartbreak into freedom. With a secret sexy bucket list in hand, she sets out to take back control of her body, her choices, and her future.
Enter Luke: her brother’s best friend, the man who’s always been off-limits, and the last person she expects to find running an exclusive adult club called Salt. One reckless proposition might just change everything…

Their no-strings agreement was meant to be simple. But every item Emmy crosses off only fuels the fire between them – and strips away Luke’s armour in ways he never saw coming.