Sweet Heat book by Bolu Babalola

Three years after their break-up, Kiki's worked hard to forget her first love. But just as she thinks she's got her life under control—jumping into the distractions of her romance-by-calendar-invite boyfriend, and plans for her best friend, Aminah's, wedding—Kiki's career implodes, the family business teeters on collapse, and Malakai returns. As Malakai takes up his role as best man opposite her maid of honour, suddenly Kiki can think of nothing but their simmering chemistry, what went wrong, and why it is now impossible to act normal around each other.

Juggling a new job, the prospect of her parents' restaurant being sold, and keeping her best friend from going full bridezilla, dealing with The Ex is the last thing she needs. But somehow the spark between them is only getting hotter—and threatening to ruin everything.