Inside a fancy hotel, the Simpsons celebrate paying off the mortgage on their home. Homer gorges himself on the brunch buffet until he’s so full he can’t take another bite. Meanwhile Bart and Lisa get into a food fight. Marge chastises the children for making a scene, attracting the attention of the entire ballroom. Homer insists the children be thrown out of the hotel. Later Homer makes his way to Moe’s tavern, where he complains about the kids and guzzles down beer. Moments later a health inspector strides through the front door. The barflies fear the bar will be closed down because of the egregious violations, but they breathe a sigh of relief when the inspector turns out an old friend of Moe’s. Unfortunately the health inspector samples a pickled egg… and immediately drops dead. A new health inspector is dispatched to the bar to finish the job. He gives Moe a list of all the things that need to be fixed before the bar can reopen. Unfortunately Moe doesn’t have the money to make the repairs. The Board of Health closes the bar, and Moe tells his regular customers they might want to try the gay bar across the street. Homer promises Moe he’ll help him reopen the business. He approaches a loan officer, who says Homer would have to put up his house to raise the money. Later Marge intercepts a letter from the bank, and realizes Homer took out a new mortgage. Marge decides that since she has a stake in the business, she’s going to make big changes to the bar. Moe is stunned.

The next time Homer enters the bar, he’s crestfallen to discover that Marge has taken over. Marge insists she’s only protecting the family’s investment. She decides the best way to expand the bar’s business is to turn the bar into a British pub and sell both beer and food. Before long the bar has been transformed into a Tudor-style English pub called The Nag and Weasel. The bar is a huge success, and even Mr. Blackwell gives it his blessing. Moe credits Marge for the turnaround. Before long Marge spends more time with Moe than she does with Homer. Homer grows increasingly frustrated with the situation.

When Marge and Homer go to the movies together, Homer tries to get romantic. Moe shows up at the screening, however, and ends up sitting next to Marge and Homer. As time passes Moe and Marge become inseparable, until Homer ends up feeling like a third wheel. When Homer tells his friends from work about the situation, Carl and Lenny say that Marge is having an “emotional affair” with Moe, and although there’s no physical intimacy, it could destroy Homer’s marriage. Lenny urges Homer to engage Marge’s feelings. Homer takes their advice, but soon learns that Moe and Marge are flying to Aruba together for a restaurant owner’s convention. Lisa urges Homer to race to the airport before they leave. Meanwhile, as the airplane sits on the runway, Moe hatches a scheme to trick Marge into sharing the same hotel room with him. A few moments later an impassioned Homer drives to the airport, and with some help from Chief Wiggum, boards the plane by climbing the stair-car and crawling through the plane’s toilet hole. When Homer realizes that Moe knows Marge better than he does, he gives up hope. He opens the cabin door and is almost sucked out of the plane. Homer closes the door and makes his way to the airplane galley, where he anxiously gulps down everything in sight. Marge finds Homer and tells him she took a vow on their wedding day, and will love him for better or worse. She also tells Homer how much she loves him. Later Marge and Homer walk the beach in Aruba, while a large wave washes a stingray onto Moe’s face. That night Moe and Homer end up sharing the same hotel room, while Marge sleeps on a couch.