S is for Secret Baby by Annie J. Rose

Sleeping with the enemy?
Well, now she works for me.
Rian was my rival in college, vying for the same internship.
Sometimes enemies are fire between the sheets—we were.
Until she walked off with the internship.
Now, the smart-mouthed beauty who always kept me guessing got downsized and takes a job out in Nebraska out of desperation.
She’s working for me.
I don’t mind her working under me, but I’d rather have her in bed.
Or across this desk.
Her ideas are brilliant and the flirting is hot, so we’re playing with fire.
Against company regulations, we have a blazing secret affair.
I can’t get enough of her, and I know she feels the same way.
Everything’s like a fantasy until a phone call sends her into a panic, and our sexy business trip is cut short.
Because Rian has a secret.
She took more from me than that internship in college.
She has a daughter—my daughter.
A child who was kept secret from me by the enemy I’ve come to love.
Nothing can ever be the same now that I know her secret.