It was the shriek heard round the world. Single mom Mary Karen Vaughn woke up in Las Vegas with a ring on her finger . A full-time RN raising three small boys, she had no room for romance. And then there was Dr. Travis Fisher, whose sexy allure always set her hormones on fire. One second Travis was a confirmed bachelor vowing never to marry or have kids. The next, he willingly walked down the aisle Mary Karen had a way of fueling his fantasies. But...