Attached At Heart by Amelie Rhys

When best friends Delaney and Blake get married in order to satisfy a clause in Delaney’s inheritance, their long-ignored chemistry is suddenly so much harder to deny, especially when they travel abroad for a steamy fake honeymoon.
Blake London, after finishing his cardiology fellowship, moves to Boston with a single hope: fix as many hearts as he possibly can…including his own. Considering the one woman he’s ever loved—his best friend from medical school—got engaged to another man, he needs to move on.
But that’s easier said than done, and Delaney proves harder to escape than he expected.
***
Delaney Delacroix’s fiancé has fallen in love with another woman. Since love was never part of their arrangement, Delaney isn’t upset about it. But it does mean she can’t access her inheritance until finding a replacement husband, and she must put off her dreams of founding a specialty heart clinic for patients like her brother.
In the meantime, Delaney returns home to the East coast where she stumbles into Blake, whose abrupt cross-country move had devastated her. Their unexpected reunion is shocking, as is the reveal of Delaney’s broken engagement—her fake, broken engagement. But nothing stuns as much as Blake’s reaction: he promptly steps up to the plate. Or rather, the altar.
Their decade-long friendship can survive a year of playing husband and wife…right?