Love on Dragon Wings by Shane Honorae

As a dragon veterinarian, Trent has seen clients of all shapes and sizes come through his clinic — both human and animal. His favorite client is Cole, the sweet and shy man who runs a shelter for dragons out of his home. Despite the way Cole makes his heart pound, Trent is determined to keep their relationship professional…even if he falls harder for Cole every time he brings in another rescue.
That changes the day Cole brings a recently abandoned egg-heavy dragon into the clinic. Breeding females are rare, their eggs even rarer. When word gets out, her former owners want her back, and they won’t accept no for an answer.
In order to keep both Cole and the dragon safe, Trent will have to let down his walls and open his heart.