This is a modern urban novel that boldly explores the limits of open relationships and emotions. The story centers on a married couple who planned an exciting foursome adventure at the end of 2012. The protagonist and his wife, seeking novelty in their marriage, are captivated by their wife's passionate interactions with her young college lover, prompting him to propose a group party. Introducing a southern girl, "Chubby," as the fourth participant, the couple meticulously arranges everything from the hotel location to the intimate details, striving for a perfect feast of passion. The novel delicately depicts the interactions among the foursome, from the awkwardness of their first meeting to the escalating intimacy, revealing the complex interweaving of desire, jealousy, and tacit understanding. The story not only captures the physical encounters but also delves into the participants' struggles and compromises between morality, emotion, and pleasure, painting a vivid picture of unconventional relationships in the modern city.