Day and Knight — Michelle L. Levigne

Glori loved working with children--and not just because children produced magic that fed her own Fae magic. But when her magic started going wonky and all her maintenance spells for the daycare started working backwards, not even her Fae administrator could fix what was wrong.
Lance Knight faced a lonely future, thanks to a family curse that turned him into a mouse at the dark of the moon. Lonely, except for the ghosts of all his angry, misogynistic male ancestors. And he would join them someday, if he didn't find a woman to love him despite the curse.
He needed the kiss of a Faerie princess to break the spell. When he got called to Glori's daycare center to deal with an unbelievable bug problem, and realized she was a Fae, he thought his problems were solved.
Glori hated telling Lance that the Fae didn't have hereditary royalty anymore, but she promised she would try to find him a solution while they worked together to solve her problem. Things got sticky when she realized that she was going through the Fae equivalent of puberty, and Lance might just be the answer to her problem.
If only his nasty, ghostly relatives wouldn't keep getting in the way.