The Nanny Contract by Jason Collins

CASEY:
Logan Westbrook is everything I should avoid: broody, straight, and my boss.
Becoming a live-in nanny for a family worth six hundred million dollars didn’t faze me—until I met Logan.
The pensive, overworked dad is barely holding it together, his teenage son is still grieving, and the Mercers—his late wife’s parents—are trying to take custody of Henry, claiming Logan’s demanding career makes him an unfit father.
As the nanny, I’m caught in the crossfire, shielding Henry while helping Logan fight the biggest battle of his life.
Through it all, I’m trying to keep my feelings for Logan strictly professional. But the more time I spend by his side, the harder it is to remember my place—or what’s at stake if I let myself fall.

LOGAN:
Being a single dad was never part of the plan.
After losing my wife, it’s just been me and Henry, balancing late-night surgeries with teenaged mood swings. When my mother Betsy insists on hiring a live-in nanny, I write it off as another one of her meddling whims.
Then Casey Grant shows up.
He’s sharp, funny, and connects with Henry in a way I never could. Casey is exactly what my son needs—and the kind of distraction I can’t afford. Especially now that my late wife’s parents are challenging me for Henry, trying to tear apart the only family we have left.
But the more time I spend around Casey, the harder it is to ignore what he stirs in me. I’ve always thought of myself as straight, but Casey has me questioning everything. He’s made me feel things I never thought possible, and I’m not sure I can turn back now.

This is the first book in the Westbrook series. It can be read as a standalone with no cliffhanger.