The Billionaire's Wife Series by Chloe Cassidy

Melissa Gainsborough is under-employed, 21 years old, and works miserable hours at whatever charity events she can find. Exhausted from the evening's work at a fundraiser, she sneaks away and instead discovers a smaller - and thankfully deserted - bar in the basement. Meeting a tall, dark and handsome man within, an immediate spark is ignited between them! However, this man has a secret...