Her Choice by Fiona Davenport

After being rejected, Aaron Kemp never expected to have his own happily ever after. He spent years as a loner, coming to terms with the empty future ahead of him. But that all changed when he met Cressida Crawford.
Cressida was a rare kind of shifter. One with unique abilities that included being able to choose her mate instead of being fated to someone. But they also put her at risk if her secret was discovered.