Twins Blake and Bianca Dunlap have always been there for each other, ready to lend support and make sacrifices. Blake can't imagine a bigger sacrifice than getting along with Bianca's fiancé, Matt. Matt turns out to be more than the meathead Blake had dismissed him as, but Matt's best friend, Ryan Everett, is a different story. Ryan seems intent on being an insufferable jerk as often as possible. The fact that Blake is undeniably attracted to Ryan only makes the whole situation more annoying.
Since they'll all be stuck together for the long haul, Blake is determined to make nice. Unfortunately he overshoots, and he and Ryan end up on much friendlier terms than Blake intended. While he and Ryan agree there's no harm in having a strings-free fling, that changes when Matt and Bianca find out about it. As more complications arise, Blake and Ryan become more determined to do what it takes to avoid letting them down. But the only way to ensure getting through a joyous wedding and avoiding the questions neither of them wants to answer is to convince everyone it's something more.