Mark and Mary’s unexpected connection sparks at a local drug store, where Mary is purchasing a pregnancy test. Mark reminds her of their college encounter, leading to a date after the test result comes back negative. Fast forward a year, they are madly in love and decide to marry. However, Mary’s proposal to explore “ethical non-monogamy” catches Mark off guard. Despite his surprise, he agrees to experiment with this new dynamic, setting the stage for a journey filled with challenges, revelations, and the complexities of modern relationships.