The Christmas Gift by Robecca Austin

Ivy:
It was supposed to be a one-night stand. A hot night of sweaty indulgence with a man she’d vetted. A man she could play with and then walk away from, someone who ticked all her boxes. Instead, she was facing off with Corin, a man who hijacked all her rules and made her knees weak.
When the pregnancy stick turns pink eight weeks later, all her carefully laid plans go down in flames.
Starting over in a big city is no challenge for Ivy. She’s intelligent, successful, and can readily form a plan. Too bad her strategy didn’t involve her new boss turning out to be her baby’s father.

Cor:
Straight-laced and uptight ought to be kryptonite to Corin’s carefree, love-them-and-leave-them lifestyle. Yet, the memory of the one night with a mystery woman haunts him. When he’s finally convinced himself his memories of that night are overblown, she turns up at his firm with the Christmas gift he didn’t know he needed.