Luke Finley, the eldest of four brothers, is a committed serial monogamist. He's all for one woman at a time, but not one woman forever. He knows a lifetime of fidelity just isn't in his genes. But when his latest girlfriend kicks him out—of his condo—the woman he's always thought of as "one of the guys" turns out to be the one woman who can rock his world and make him believe in forever.

Unlike his older brother, Matthew Finley has no problems with commitment. A creature of habit, he craves the predictability of marriage and family. Unfortunately, his most enduring habit is his commitment-shy ex-girlfriend, Casey Franklin. After five months of going cold turkey, Matthew comes home to find Casey waiting for him, and he falls off the wagon. Hard.But he still wants forever, and she’s still not ready to look beyond tomorrow, leaving him two choices—overcome his addiction or her resistance. And that’s really no choice at all.

Neurosurgeon Mark Finley has a deep, dark secret. No, it’s not that he’s a dominant who likes to mix pain with pleasure; it’s that he’s in love with his best friend’s wife. Mark is wracked with guilt when his friend dies on his operating table, but when Allison begs him to make love to her, no power can stop him. But he swears it’s a one-time event. And it is until Allison turns up Mark’s favorite club. Mark can’t let another Dom have her, but he can’t have her either. Or can he?