It's a simple rule: don't bang your teammates' siblings. Finn O'Brien didn't just break the rule, he annihilated it. Falling in love with his best friend's younger sister when they were teens was an accident. He fought it for years, hiding behind a list of one-night stands a mile long, anything to convince himself Molly Morrison wasn't the woman for him. But when they cross the line, there's no going back. Finn is playing with fire. Can he keep the two most important people in his life, or will he be forced to choose?