Her Alpha Mates by Maggie Ryan

A Wolf
A Princess
A Dragon
The curse that threatens to destroy them all.

With his wife in grave danger from an ancient curse upon his family, alpha wolf Deo Ambrosia must take drastic measures, and as a last resort he calls upon the powerful dragon shifter Draco to help protect his headstrong mate.
Cassandra obeys the demands of the wolf. Submits to the call of the dragon. Gives her heart and soul to both. After exchanging the most sacred of vows, they are no longer one, but three. Will their love be enough to break the curse?
Though following the orders of two stern, dominant alpha shifters proves no easy task for Cassandra and she frequently finds herself facing stern and shameful discipline from her mates, she is shocked by the intensity of the pleasure when the two fearsome beasts both claim her at once. But will her penchant for reckless disobedience put the entire pack in even greater peril?