Fated by Hawke Oakley

River:
Getting kidnapped by human poachers isn’t River’s idea of a good time.
Unlike his easygoing twin, River is uptight and sensitive. It’s easier for him to push people away than to let them in. His heart is delicate, and a single misstep might shatter it forever. It almost happened once. Why risk it again?
One day, River ends up in the wrong place at the wrong time. When his life is at stake, his only hope of escaping his kidnappers is an impromptu bodyguard—a protector in the form of a beaver shifter. A very handsome beaver shifter who gazes at him like he’s the only man in the world.
But River’s heart can’t sing for an overgrown wet rat… can it?

Castor:
Nothing is more important to Castor than family. The problem is he doesn’t have one.
For beaver shifters, finding their soulmate is the greatest blessing imaginable. Their lives revolve around building a dam and nurturing a family. But at 40 years old, both Castor’s home and heart are empty.
Just when Castor thinks he’ll be single forever, he catches a whiff of his fated mate’s scent. But it’s in the worst place possible—in the back of a poacher’s boat.
Castor will fight tooth and nail to save his soulmate. But can the unlikely pair escape from the humans before it’s too late?