Beautiful Stranger - Christina Lauren

When Ryan Media Group opens a new office in New York, numbers whiz Sara Dillon happily accepts the position of Director of Finance. On her first weekend in her new town, Sara has wild - and very public - sex with a gorgeous stranger on a balcony overlooking Chloe Mills' raucous engagement party. Sara assumes the tryst was a one-time thing, but when her mysterious lover sends her the steamy phone video he took of their encounter, she realizes he might have unearthed a side of her she'd never let herself explore. Unfortunately, an affair with Max Stella, Wall Street's newly-imported golden boy, could be very, very bad for her new career. Max has a legendary appetite for casual sex, but the kindred kink he finds in Sara is hard to brush off. Soon the formerly-irresistible investment banker finds himself pursuing a woman who seems to want very little to do with him outside of their playful and creative exhibitionism. They have only three rules: keep it casual, keep it private, and no faces. That is until Max convinces Sara to come with him to a club that opens a new world for them, and their sex-only relationship grows decidedly more intimate.