Bad Blood by K.S. Ellis

PADDY
I know what they say about me: I’m dark, dangerous, and damaged. The opportunity to avenge my parents’ murders was stolen from me, and now I hate the world. Can you blame me? What has the world ever done for me? Less than nothing. Fighting and fucking are the only two outlets I have for my anger, and I’m very, very good at them.

LAUREN
When did life get so complicated? I’m all alone with nowhere to go. Before he died, my older brother, Josh told me that if I was ever in trouble, I should go to one of his fellow bare-knuckle fighters, Paddy Flynn, an enforcer for the Boston Irish Mafia. But now I actually need help, I’m a little nervous that the cure might be worse than the disease.
Paddy knows he should stay away from Lauren before his darkness completely envelopes her. But he’s drawn to her again and again, and nothing he tells himself can make him stay away. Can Lauren save Paddy from the darkness he seems content to drown in? Or will he drag her down with him into the cold, dark depths?