His Obsession Her Curves by Hope Stone

Single dad billionaire, Jack McAllen, needs a favor from his beautiful and curvy nanny, Tessa. Jack’s business is hinging on closing a deal with a client at a retreat and he needs Tessa to play the part of his wife to keep up appearances. But will they be able to pull it off without their secret being exposed by Jack’s nemesis who tags along for the weekend?!
Jack
“The investor assumed I had a wife because I, well, I still haven’t taken off my wedding ring. And I didn’t have a chance to correct him and now I’m expected to bring my imaginary wife and very real children to his house in the country for the weekend. I honestly don’t know what to do. If I tell him the truth, I might lose him as an investor and the company needs his money or I’m going to have to start letting people go.”
Tessa
“I could be your wife.” I heard the words come out of my mouth before I knew what I was saying. “I mean, I could pretend to be your wife. If that would save people’s jobs, I’d be happy to help out.” 
He looked at me for a moment and I was worried he thought I was overstepping my boundaries. But then he smiled questioningly. “You’d do that for me?