The Alpha's heart - The Nightshade Pack Chronicles.

“When three best friends find out they are in fact all three supernaturals in disguise, life can only become more interesting in the human world. In this first book in the series, Gabriella has to return home to her pack after living life as a human for a while and her friends go with her. She meets the enigmatic leader of her warriors who has also secretly been spying on her while she was living in the city. Will she forgive him his sins when she realizes he is her mate? Or will she banish him from their pack?”