The Games We Play (Iron Outlaws MC 2) by Scarlett Cole

Iris: As a woman born into an Irish crime family, I'm expendable. It's why I've extricated myself from that life. Only now, I'm wrapped up in another one when I witness the death of the president of a motorcycle outlaw club. And the club's sergeant at arms has declared himself as my protector... Or stalker. And I can't decide if he terrifies or excites me.

Spark:
Too many people have died on my watch in Kabul and New Jersey.
My conscience can't carry the weight of one more. Especially a pretty young thing with eyes that pierce my truths.
But her family is our enemy. One of many.
And she hates the things I pride myself in standing for.
Until she needs me to play her family's deadly game. A game to ruin us all.