Everyone knows the rules. Never date your best friend’s little sister. Never fall for your best friend’s best friend. And whatever you do, never keep secrets from the people you love. For years, Heathcliff Beckett and Ethan Carter have been inseparable. Best friends. Teammates. Brothers in everything but blood. They’ve always shared everything — except the one thing Heathcliff knows Ethan would never forgive him for taking. Elle Carter. Ethan’s little sister. Elle has spent her entire life being the girl Heathcliff was never supposed to notice. But senior year changes everything. She’s no longer the little girl following them around. She’s the captain of the dance team, confident and impossible to ignore — and suddenly, Heathcliff can’t seem to look anywhere else. What starts with stolen glances quickly turns into something neither of them can control. But there’s another secret brewing between their two worlds. Ethan Carter has fallen for Sophie, Elle’s best friend. Now, with two best friends falling for two girls who are practically sisters, everything should be perfect. Except Elle and Heathcliff are keeping their relationship a secret. And when the truth finally comes out, Ethan will have to face the ultimate betrayal: his best friend has fallen in love with his little sister. Between football games, dance competitions, jealous exes, parties, broken friendships, and the pressure of senior year, four teenagers are about to discover that falling in love is easy. It’s everything that comes after that is complicated. Because sometimes the person you’re forbidden to love is the person you can’t live without. And sometimes, choosing love means risking losing the people you’ve loved your entire life.