Claws of the Lynx by Linda O. Johnston
Nella and Alec had once shared a steamy relationship with the promise of a long-term commitment--unil Alec saw her transform into a lynx. Hurt that Alec couldn't accept that she is a shapeshifter, Nella moved on...and joined the Alpha Force, a military organization of people with paranormal abilities.
Years later, Alpha Force's secrecy is being threatened by an out-of-control journalist. Charged with retrieving the information that could expose the Alpha Force, Nella is forced to team up with the last person she expects...Alec! Once reunited, Nella and Alec soon discover that their attraction is as strong as ever...but can Alec ever learn to accept Nella for who she is?