Status Updates From Lost Lycan's Mate (Book 4):...

Skitka and Winter

Beta of the Lycsn pack comes home after 20 years of searching for his mate all around the world. He is shocked when the 20-year-old of the alpha, his best friend, is his mate - only trouble is she’s mated to someone else.

This is a complicated story that addresses cheating and secrets. Not sure how i feel since i cannot condone cheating anyway you look at it.