Let Go My Gargoyle by Tami Lund

Four years ago, dragon shifter Sofia had an affair with a gargoyle. The next morning, he disappeared—and abandoned an infant on her doorstep.

Now he’s back, and Sofia is afraid he wants to claim the child she’s been raising as her own.
Griffin isn’t back because he wants the child. What Sofia doesn’t know is that the kid isn’t even his. He’s back because his boss told him to protect her and the baby. A task he doesn’t think he’s capable of doing.
Unfortunately, the more time he spends with Sofia and her adopted daughter Penelope, the less he wants to leave.
And the more danger he’s putting them in.