For the Love of a Bear by Sunny Mawson

Calla Stirling is living a humble life in the Breagha Oidhche Wolf Pack in Scotland when her teenage life is turned upside down by her would-be mate. She knew a mate would present himself in the future, but what she didn’t expect was the gruff Russian bear Sergey Patrushev, Vojak of Clan Chislennost.
Off to a rocky start thanks to the ill-advised plan Sergey uses to introduce himself to his mate, they have bigger problems than the fact she’s still underage. Sergey needs to get back to his volatile bear clan in Russia, but he won’t be without his mate. Constant strife within his clan, Sergey knows he needs to present a united front with his wolf mate, Calla, regardless of the danger her presence presents to both of them.
Faced with traitors, Sergey and Calla call upon their wolf allies to help them end the coming war. Only a bond forged in destiny can bring the pack and the clan together to defeat their enemies both old and new.