Witch you weren't here / Emma Jackson.

"Kay knows three things to be true: a witch who cannot control their powers is dangerous, she needs to make it home for her brother's wedding, and Harry Ashworth is the last person she ever wants to see. But after visiting the witching community's equivalent of IT support to try to fix her misbehaving magic, a hurricane hits and her flight home is cancelled! Not only is Kay stranded, but she's stranded with Harry, her infuriatingly handsome and charming childhood friend, who broke her heart when they were teenagers. Except Harry is a frustratingly powerful witch so working together might be their only way to get back home. And the more time they spend together, the harder it becomes to ignore what is simmering under the surface. Soon it becomes clear that Kay's magic isn't the only thing she doesn't have control of."--Publisher.