Birthday Girl by Mary Waterford

Mikayla can’t remember not loving him. Rafe can’t remember not loving her. But neither of them had felt anything like this before.
When your best friend starts looking at you with eyes so hot your clothes practically take themselves off, what can you do?
Unable to bear the tension that threatened to engulf them both, Mikayla did what she always did: confronted Rafe head on and offered up a solution that neither of them could resist: Friends with benefits. Hurt by past relationships, they both promised to respect the rules they set for themselves for no-strings-attached, sizzling hot sex.
Blurring the lines between friends and lovers and breaking their own rules, pretty soon, things got hotter than either of them could handle. This time, Mikayla doesn’t have a solution.
Can these childhood friends-to-lovers tread these new waters and swim to their happily ever after?