Because of baby

It had seemed like a grand idea, temporarily trading her pixie wings for a womanly form to help handsome widower Paul Roland with his baby girl. And the moment she held the precious bairn in her arms, Fern knew true happiness for the first time. But she never anticipated the dizzying emotions she felt for the man who not only needed her as a nanny, but as a woman whose passion could heal his wounded heart.

Suddenly the fairy rule she'd gently bent because of the baby was in danger of being irrevocably broken -- for falling in love with a mortal man was forbidden.