Fated: Harpy and the Mouse by Hawke Oakley

Meeko
Don’t trust anyone.
That’s Meeko’s life motto. As a mouse shifter, he’s the weakest of the weak. But Meeko has a killer survival instinct. He skilfully wields his father’s sword to protect himself against the world. No matter what he’s been through, he’ll live—even if it means going it alone forever.
But when Meeko’s prized sword is stolen by a mysterious entity, he’s forced to put his trust in a terrifying foe—a harpy with razor-sharp talons, an obsessive gaze, and who makes Meeko’s heart race for reasons other than fear…

Cloud
Everyone deserves a chance.
Cloud lives by relentless optimism, always seeking the silver lining. Gloomy loners aren’t his cup of tea and he certainly doesn’t want to spend the rest of his life with one…
When Cloud gets burned by someone he thought was a friend, he’s thrust into a situation that challenges his every belief. Can he still trust everyone? How long can he tolerate the cute-but-crazy omega mouse shifter who wants to stab him?
And worst of all, why can’t he stop obsessing over Meeko?