No Longer Strangers — Rachel Ann Nunes

When zoologist Mitch Huntington agreed to be named guardian to his best friends' daughter, he was sure it meant nothing more than pony rides, presents on birthdays, and an occasional day at the circus. Suddenly he finds himself up to his elbows in diapers and soggy oatmeal. While Mitch soon discovers that animals and babies are not the same things, he quickly becomes totally devoted to the adorable baby girl. But Cory Steele, the child's estranged aunt, has other plans. Cory will stop at nothing to rescue her little niece from the clutches of this unfamiliar Mormon man, even if it means pretending to join his strange church in order to gain Mitch's trust and assume custody of the child.