The au pair affair : a novel / Tessa Bailey.

Tallulah is smart, vivacious, and studying to be a marine biologist. She's also twenty-six and broke. So when Burgess, a battle-scarred hockey veteran and newly single dad, offers her a job as his live-in nanny, she jumps at the opportunity to get paid while living in a super fancy neighborhood and being around Lissa, his cool but introverted tween. Her tween charge isn't the only one who could use some help fitting in, though. According to...well, everyone except Burgess, he needs to get back on the dating scene, and adventurous Tallulah is just the girl to show him how. But as boundaries are slowly crossed and Burgess finds himself pulled between his daughter, who wants her parents back together, and his insane chemistry with Tallulah, a huge rift is formed, and Tallulah does the "right" thing--breaks her own heart and walks away. Though Burgess knows it's for the best--he's too jaded, with too much baggage--a chance meeting, and a new push from his daughter, forces him to put everything on the line and fight to prove he learned his lessons well and is worthy of a happily ever after with Tallulah.