Adrenaline by Penelope Douglas

When urban explorer Katrina Tavares visits the abandoned Elara amusement park, she unknowingly enters a den of wolves, otherwise known as her ex-boyfriend Adam and his pack of hellion friends.

Adam Ryan wants to hate Katrina, but mostly he hates that he wants her so much. Four years ago, she broke his trust, and it pushed him down the dark path that led him back to this park, to the place his father died, and where he and his friends buried the body of the man responsible.

Adam tells his friends to scare Katrina off, but they seduce her instead. If he doesn’t claim her, his friends will. After all, they’re used to sharing everything.