This Billionaire's Secret - This Billionaire, #32

Luke is a confirmed Bachelor who loves to travel all around the globe and romance as many women as possible. That is until he meets Gabby. One night with her and he is changing his views of bachelorhood and starting to think that married life is the new way for him. Gabby comes from a wealthy family, and has had one too many good looking men take advantage of her family's money. When she meets confirmed bachelor and known playboy Luke Smith, she is distrustful of his flirting, and tries to avoid him at all costs.
That is until they end up trapped in an elevator, and her fear of the dark, tight space is greater than her fear of the man she is trapped with. Luke comforts her by making steamy love in the elevator, and when she runs away once they are free, he walks away wanting more.