God of Wrath (Legacy of Gods, 3) by Rina Kent

From USA Today bestselling author Rina Kent comes the third in a dark and steamy college romance series featuring elite criminal families and morally gray heroes. Cecily is barely staying afloat when mafia prince Jeremy Volkov storms into her life. He's never wanted anything for himself, but he wants Cecily…and he'll have her.

I've been trapped by the devil.

When Cecily Knight does a favor for a friend, going to the Heathens' violent initiation competition to get a lay of the land for a rival gang, she thinks she may be able to get away with it because she has a superpower: invisibility. She can slip through most situations unnoticed. But immediately, she realizes her mistake. Behind enemy lines on a night like that, she's done the opposite, and the devil has noticed her.

Jeremy Volkov isn't really the devil, but he may as well be as far as Cecily's concerned. He's not just a member of the Heathens―he's their leader, heir apparent to the Russian Bratva, and her one and only match on a kink app where she's finally admitted her darkest desires.

And now, Jeremy has barged through her defenses, stalking her from the shadows and stealing her from the life she knows. He says he's out to protect her, but she knows the truth: he's out to possess her, own her, keep her.

And Cecily? She has no intention of becoming a part of his blood-soaked world…or so she thinks.