Seductive Kiss by Francis Ray

I hesitate to say that this is my favorite in the Grayson Family and Friends series. Alex is a great hero. He is the brother of Catherine Stewart Grayson (Luke's wife). I believe this is the only story in the series where the couple was not set up by Ruth. I will have to re-read the one about Sabra's sister to make sure I am right. 

Dianne, was in need of a friend and a better family. She was the face of her family's company but once her grandfather died and a new CEO was named, she was outed.. The rest you have to read to find out.
This is Book 5 in the Grayson Friends Series.